# Robin Berzin, MD — Full Content Export

> Evidence-based, physician-written guidance for women on hormones, metabolism,
> longevity, fertility, nutrition, toxins, and brain health. Author and reviewer:
> Robin Berzin, MD (Columbia University; Internal Medicine, Mount Sinai).
> Educational only — not a substitute for professional medical advice.

> Source: https://www.robinberzinmd.com/ · Index: https://www.robinberzinmd.com/llms.txt

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## Fish Oil Is Controversial. Your Omega-3 Index Isn't.
URL: https://www.robinberzinmd.com/omega-3-index-fish-oil-epa-dha/
Updated: 2026-08-11 · Topics: Newsletter, Longevity & Metabolic Health, Brain, Mood & Nervous System
Summary: Why your Omega-3 Index matters, where plant omega-3s fall short, and how to choose and dose an EPA+DHA supplement.
Robin's Short Version Get your Omega-3 Index checked. Target range: 8–11%. If you supplement, take real fish oil—marine EPA+DHA—not a plant-based capsule. Flax, chia, and walnut oil are not fish oil substitutes. 95% of Americans are deficient in the fat your brain is made of. I take fish oil every single day. Before I got pregnant. During pregnancy. Through breastfeeding. And every ordinary day before and after that, too. These days, it's a whole-family thing—my kids get an EPA/DHA supplement from Metagenics too. Not because it's trendy—it's not. If anything, fish oil might be the most argued-about supplement on the shelf. Half the wellness world calls it snake oil. The other half won't skip a day. I've read the actual trials. My take: the confusion isn't really about whether omega-3s work. It's about which ones, how much, and whether you're actually getting them into your blood. If you've never had your Omega-3 Index checked, it's one of 80+ biomarkers on my Longevity Labs panel—and it's one of the first things I look at. Check yours → This week: what that number actually means, why your brain (about 60% fat) needs it, and exactly what to take—and skip—if you're going to supplement. What to know: Real omega-3s aren't optional — they're structural. The old assumption vs. the new reality ❌ The old assumption: any omega-3 source counts—flax, chia, walnut, algae, fish, doesn't matter. ✅ The new reality: your body barely converts plant ALA into usable EPA and DHA—under 8% converts to EPA, under 4% to DHA. 1 A tablespoon of flaxseed oil is not a fish oil substitute. ❝ Nearly 95% of Americans fall into the "high risk" category on the Omega-3 Index. 2 ❤️ Heart Pooled across 13 trials and 127,000+ people, marine omega-3s lowered risk of heart attack, coronary death, and cardiovascular death by roughly 7–8%. 3 A high-dose purified EPA trial cut cardiovascular events 25% in high-risk patients. 4 A lower, general-population dose showed no overall benefit—except in people who ate little fish to begin with, where risk dropped 19%. 5 The people who benefit most are the people who start out most deficient. 🧠 Brain DHA is a core structural fat in neurons. In the Women's Health Initiative MRI study, women with the lowest Omega-3 Index had measurably smaller brain and memory-center volume than women with higher levels. 6 💛 Mood & hormones EPA specifically (not DHA) shows real antidepressant-level effects—but only in formulas where EPA makes up 60%+ of total EPA+DHA, at 200–2,200mg/day of EPA. 7 Low-EPA formulas showed no benefit. The same EPA-forward dosing helps in pregnancy and postpartum depression specifically. 8 In PCOS, a meta-analysis of 10 trials (N=610) found omega-3 supplementation significantly lowered total testosterone and raised SHBG. 9 What to do: Test first. Then choose real fish oil, dosed right. 1️⃣ Get your Omega-3 Index tested—then know your number. It's a simple blood test measuring EPA+DHA in your red blood cells, which reflects roughly the last 3–4 months, not just yesterday's dinner. It's part of my Longevity Labs panel. Retest annually, or 3–4 months after changing your dose. Under 4%: high risk (most Americans land here) 4–8%: intermediate 8–11%: target range 2️⃣ Skip plant-based omega-3 if fish oil is the actual goal. Flax, chia, and walnut oil supply ALA, which converts to EPA/DHA at under 8%. If you're avoiding fish entirely, algae oil is the real exception—it supplies preformed DHA directly, the way fish do. 3️⃣ Choose a real, tested fish oil. Look for triglyceride form, which absorbs better than the cheaper ethyl ester form, 10 molecular distillation to remove mercury and heavy metals, and third-party testing for purity. This is why I take Parsley's Mega Omega 3—sourced from sardine, anchovy, and mackerel, and tested batch by batch. 4️⃣ Dose it consistently. 1–2g/day combined EPA+DHA is the range most trials use. Two softgels of Mega Omega 3 gives you 860mg EPA + 580mg DHA (1.4g total) daily. 👉 One caveat: risk of Atrial Fibrillation (AFib)—a specific heart arrhythmia—rises with dose. Trials above 1g/day showed a higher relative risk than those at 1g/day or under, and the highest-dose cardiology trials (near 4g/day) showed the strongest signal. 11 At standard supplement doses, absolute risk is low—but flag it with your doctor if AFib runs in your history. The goal: real fish oil, real dose, retested to confirm it's actually working—not a guess. 💛 The Loving Longevity (formerly Momgevity) Files I'm re-titling "Momgevity" because someone reached out to me on Instagram and said they trademarked "Momgevity." I'll be honest, I'm annoyed! This term isn't well known. If you're going to trademark something, use it—and if you aren't, let it go so someone else can! Anyway… rant over. This week I'm getting back into gear after two weeks in Spain. It felt really good to disrupt my routine. Sometimes you have to miss something a little to appreciate it, and exposing yourself to new ways of being is essential to avoid life getting stale. One of the workouts I did in Ibiza was called Primal Moves—a full-body workout that combines parts of HIIT, yoga, and capoeira, the Brazilian dance-meets-martial-arts practice. It's now in LA too—if you're there, check it out and let me know if you like it. It forced me to use my body, and my brain, in very new ways, which was like a light going on for muscles I rarely touch or engage. It made me think about what other parts of myself I haven't been using, or that are available to turn on if I try something new. I'm in a moment in life when I'm being asked to change, and I'm not alone. So many friends, patients, and acquaintances are in a similar spot—as if the universe is collectively putting a boot on our butts to move, shift, and grow, whether we like it or not. So I'm leaning in. I've got a list of books to read, I'm signing up for a pottery class, and I have a list of retreats on the docket—I plan to attend at least two this fall. I tend to resist change, so consciously I'm embracing it with courage and love instead of resistance. I find doing little things, like a new workout, creates just a little plasticity—that perfect BDNF (brain-derived neurotrophic factor) boost—in a way that opens more doors from there. Longevity isn't possible without plasticity, flexibility, and a willingness to change. Static equals brittle. It's one reason I love yoga—it forces me to stretch my connective tissue in ways I don't in walking, cardio, or weights. It initiates physical flexibility, advancing my flexibility of thought off the mat. So if you're finding yourself feeling stale or stuck this summer, find a new way to move—literally. As you move your body, you move your mind, and your life can change, for the better, if you let it. ⚡ One more thing… Your Omega-3 Index is one of 80+ biomarkers on my Longevity Labs panel—book yours here →. Want to start today without waiting on labs? This is the fish oil I take and recommend: Parsley's Mega Omega 3 →. References Lipids in Health and Disease, 2009. OmegaQuant data. Journal of the American Heart Association, 2019. New England Journal of Medicine, 2019—REDUCE-IT. New England Journal of Medicine, 2019—VITAL. Alzheimer's & Dementia, 2021. Journal of Clinical Psychiatry, 2011. Translational Psychiatry, 2020. Annals of Palliative Medicine, 2021. Prostaglandins, Leukotrienes and Essential Fatty Acids, 2010. Circulation, 2021. Originally published in the Off Script newsletter. Join Robin’s readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Why Is Everyone Suddenly Talking About Endometriosis?
URL: https://www.robinberzinmd.com/endometriosis-diagnosis-tests-treatment-protocol/
Updated: 2026-08-04 · Topics: Newsletter, Women’s Health & Hormones, Deep Dives
Summary: Endometriosis still takes years to diagnose. Two new non-invasive tests and a layered functional medicine protocol offer real reasons for hope.
Robin's Short Version Endometriosis affects an estimated 1 in 10 women and girls of reproductive age, yet diagnosis still takes an average of 7–10 years. Two non-invasive tests recently backed for early NHS use could help move diagnosis beyond the old “surgery or nothing” model, though neither is FDA-cleared in the US yet. There is no single cure, but investigating pelvic pain, supporting digestion and estrogen metabolism, reducing inflammation, limiting endocrine disruptors, and discussing progesterone support can make symptoms far more manageable. I've treated thousands of women with endometriosis through Parsley. Every one of them had some version of the same story: debilitating pain, dismissed for years, told it was “just bad periods.” Suddenly, everyone's talking about it. Bryan Johnson has been documenting his girlfriend Kate Tolo's endometriosis diagnosis in real time — his team says they got her answered in 42 days without surgery. Lena Dunham's new memoir, Famesick , spends its best chapters on the disease that led to her hysterectomy at 31, after doctors found 37 lesions on her liver, spine, and abdominal wall. Here's what's wild: an estimated 1 in 10 women have endometriosis. It still takes 7 to 10 years , on average, to get diagnosed. And the official “gold standard” test has been exploratory surgery. If your periods have ever taken you out for a day (or more) — that's not normal, and it's exactly the kind of pattern I'd want to map to your labs. Let's figure out what's going on → This week: what we actually know about endometriosis, the two new non-invasive tests just backed by UK regulators, and the functional medicine protocol I use with patients — because there's real hope here, even though we need a lot more research. ⚡ The Estrobolome Reset If you have any signs of estrogen dominance — heavy periods, bad PMS, endometriosis, fibroids — start here: fix your gut's ability to clear excess estrogen. 25–35g fiber/day (beans, chia, berries, leafy greens) A probiotic + calcium D-glucarate (500mg, 2x/day) — together they stop your gut from recycling estrogen back into your bloodstream instead of excreting it 🤓 What to know: it's common, poorly understood, and possibly immune-related ❌ The old assumption: Endometriosis is “just” period pain, and the only way to diagnose it is surgery. ✅ The new reality: An estimated 1 in 10 women and girls of reproductive age have endometriosis — about 190 million people worldwide. 1 And diagnosis no longer requires surgery first — updated European guidelines now say imaging plus symptoms should come first, with laparoscopy reserved for unclear cases. 2 ❝ It still takes an average of 7 years to get diagnosed. Not because we lack answers — because we've relied on surgery to get them. 🧬 How it develops The leading theory: menstrual blood flows backward through the fallopian tubes and implants in the pelvis — “retrograde menstruation,” recently confirmed with DNA evidence. 3 But that happens in ~90% of all women. Something else has to go wrong — immune cells failing to clear the stray tissue, inflammatory signaling turning it into something that survives and grows. 4 🩺 Not officially autoimmune — but your immune system is involved It's not classified as an autoimmune disease. But a 2025 study found women with endometriosis have roughly 2x the odds of also being diagnosed with an autoimmune condition — RA, Hashimoto's, lupus, MS — within two years. 5 Researchers are increasingly calling it a systemic inflammatory disease, not just a “period problem.” 🧪 Two new tests might finally end the surgery requirement In July 2026, UK regulators (NICE) greenlit two non-invasive tests for early NHS use: a saliva test ( Ziwig Endotest , 97% sensitive / 94% specific) and a gut-electrical-activity test ( EndoSure , 91–96% both). 6 Neither is FDA-cleared in the US yet — but it's the first real crack in “surgery or nothing.” 💪 What to do: a real protocol, and hope 1️⃣ Get a doctor who will actually investigate. Start with an OB-GYN who takes chronic pelvic pain seriously and pushes for imaging instead of “let's wait and see.” This is exactly what we do at Parsley — we quarterback the workup and build the protocol below alongside your conventional care. Let's get you answers → 2️⃣ Fix digestion first — this is where the estrobolome protocol lives. Your gut bacteria can “reactivate” estrogen your liver already packaged for excretion, sending it back into circulation. 25–35g fiber/day — binds excess estrogen before bacteria can reactivate it A probiotic to rebuild Lactobacillus/Bifidobacterium Calcium D-glucarate, 500mg twice daily — directly blocks the enzyme (beta-glucuronidase) responsible for reactivating estrogen If bloating or constipation are prominent, ask about a SIBO breath test — one 2025 study found overgrowth in 92% of endo patients vs. 83% of controls. 7 The goal: a bowel movement every single day 3️⃣ Target estrogen metabolism with specific supplements. Indole-3-carbinol, 200–400mg/day (I use Meta I-3-C). Best human data of the group — shifts estrogen toward its weaker, safer metabolite. 8 Vitamin B6, 50–100mg/day — a direct cofactor for progesterone production Vitamin D — get tested. Most women with endo run low; if you're deficient, 2,000–5,000 IU/day with K2 to get into range. 9 Omega-3s, 2g/day — the exact dose used in the only placebo-controlled trial that showed pain reduction. 10 Magnesium glycinate, 200–400mg at night — baseline metabolic support 4️⃣ Try a targeted elimination diet — it's a diagnostic tool, not a fad. This isn't really about dairy specifically. Cutting inflammatory foods — gluten (highly inflammatory for some people), dairy, and whatever else you're individually reactive to — is genuinely well-evidenced for lowering systemic inflammation, even though the research specific to endometriosis is still slim. I've seen it make a real difference in my patients: one did a strict Whole30 and her symptoms completely resolved. I don't actually recommend Whole30 itself — it's too restrictive to sustain long-term. What I use instead: a personalized, targeted elimination diet. Cut the usual suspects (gluten, dairy, plus whatever shows up on food sensitivity testing) for 4–6 weeks, then reintroduce one at a time so you actually learn your triggers instead of avoiding everything forever. 5️⃣ Cut your endocrine disruptor exposure. Dioxins and PCBs are one of the few confirmed environmental risk factors for endometriosis. Swap plastic containers and wrap for glass; never microwave in plastic Skip receipts and canned food when you can (both common BPA sources) Choose “fragrance-free” over “unscented” for personal care — fragrance is where phthalates hide Filter your water — reverse osmosis or a filter certified to remove PFAS and atrazine 6️⃣ Ask your doctor about progesterone support. Progestin-only pills, vaginal progesterone, or oral micronized progesterone can meaningfully reduce pain. The catch: continuous progestin suppresses ovulation, so if you're trying to conceive, this has to be timed very precisely with your doctor — not used straight through the cycle. The goal: none of this cures endometriosis. But layered together, it's taken patients from debilitating pain to fully manageable — and in some cases, symptom-free. 💛 The Momgevity Files I'm back after a week off! Sometimes you just have to say F it and give yourself a break. That's what I did last week, during our first week in Spain on family vacation. I was exhausted: an overnight flight with two kids passed out on top of me, an unexpected reroute and extra flight through Madrid to reach our beach destination, a major presentation due for Parsley, and, well, life life-ing. But writing this newsletter brings me immense joy — it's not a chore — which is a lesson in longevity itself. We all need to step outside our routine sometimes and give ourselves grace when it's all too much. I give you full permission to do this! And I'd also say: if more of your life feels like a have-to than a want-to, it's time to reassess how you're spending your time. I'm spending my time here in Spain in a state of what I call healthy-lazy. There are regular naps. I'm doing some DIY yoga and digging a workout they have here called Primal Moves — it's super hard and energizing. But I'm not walking much. There's zero cardio. I'm letting the sun and the sea tire me out instead. I've gone to the gym to lift exactly once, and I don't think I'll go back. On the food front, it's so easy to eat well here. It's also easy to not eat well, if I choose. But I'm choosing well, because that's what makes me feel most alive when I travel. I'm loving all the produce, cheeses, and sea creatures — everything local and organic — and the change of flavor pace from my last few New England summers is very welcome. On the head-and-heart front, for once my husband isn't working remotely, and I'm mostly signed off from Parsley too — being six hours ahead is really helping with that. The past six summers in Massachusetts have honestly been very plugged-in. Instead, we're having deeper conversations, spending more time together as a family, and I'm getting to write and process life's big movements with a level of space, quiet, and focus I rarely get at home, or even on other vacations. Slowing down doesn't always mean doing nothing. Slowing down can mean allowing yourself to focus on the things that matter. In my two weeks of healthy-lazy, I'm putting my attention exactly where it's most deserved: my family and my health — which is deeply productive, both for life right now and for my healthspan down the road. It's great to put gas in the tank. It's even better to slow down and look up to see where you're going. ⚡ One more thing… If you think you might have endometriosis — or you've had symptoms for years without answers — book a consult with a Parsley clinician . We'll help you build the diagnostic and treatment plan above, tailored to you. References Euronews, citing WHO: One in ten women worldwide suffer from endometriosis (2023) ESHRE guideline: Endometriosis (2022) Fertility and Sterility: Retrograde menstruation and endometriosis (2022) Frontiers in Reproductive Health: Immune involvement in endometriosis (2021) npj Women's Health: Endometriosis and autoimmune conditions (2025) NICE: New technologies for endometriosis diagnosis in primary care (2026) International Journal of Gynecology & Obstetrics: Intestinal overgrowth in endometriosis (2025) Journal of the National Cancer Institute: Indole-3-carbinol and estrogen metabolism (1997) Meta-analysis: Vitamin D and endometriosis (2024) PurFECT1: Omega-3 supplementation and endometriosis-associated pain (2020) Originally published in the Off Script newsletter. Join Robin’s readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Outsmart the Food, Screens, and Chemicals Making Kids Sicker
URL: https://www.robinberzinmd.com/outsmart-food-screens-chemicals-kids-health/
Updated: 2026-07-20 · Topics: Newsletter, Protocols, Fertility & Parenting
Summary: The 80/20 strategy I use to protect my kids from ultra-processed food, too much screen time, everyday chemicals, and the pressure to parent perfectly.
Robin's Short Version You can't control the goodie bag. You can control the fridge. That's the strategy. The 80/20 Rule: Home-cook ~80% of meals — we pack lunch even though school provides one Zero screens on school days, no exceptions Teach resilience tools like meditation, even 1 minute at a time, early About 80% of what shapes my kids' health happens under my roof. I protect that hard, and let the rest go. I've walked into more kids' birthday parties than I can count. Same table every time: Soda, Gatorade, gummy candy, pizza that's basically cardboard with cheese. My kids eat all of it. Within an hour, one's melting down and the other's doubling over with a stomachache. Sometimes both at the same party. I'm not pulling them out of birthday parties. That's not realistic, and it's not what I want for them — they need to be in the world, not behind glass. But I'm also a functional medicine doctor who's spent over a decade treating people for the conditions that result from eating exactly what's in that goodie bag. And I'm a mom of three — 9, 6, and 4 — in New York City, trying to be consistent without being insane about it, and navigating my own health as well as a child with ADHD. It’s a lot. I'm not telling you your choices are wrong. Here's exactly what I prioritize, what I let go of completely, and why. 🤓 What to know: this isn't just “other people's kids” ❌ The old assumption: my kid seems fine, so none of this applies to us. ✅ The new reality: these numbers are the average, not the outlier. Obesity, ADHD, and autism are all climbing at once. Childhood obesity just hit a record 21.1%, up from 19.3% a few years ago. 1 ADHD affects roughly 1 in 9 kids; 2 autism, 1 in 31. 3 ❝ These aren't outlier numbers. They're the average. Food dyes aren't a fringe theory anymore. Kids with ADHD eat significantly more ultra-processed food than kids without it. 4 Blinded trials show artificial food dyes measurably increase hyperactivity — enough that a meta-analysis of double-blind studies confirmed the effect is real, not anecdotal. 5 Chemicals start before birth. Screens track with mood. Prenatal PFAS exposure is linked to ADHD, autism, and cognitive delays across multiple birth cohorts. 6 Teens with 4+ hours of daily screen time show meaningfully higher rates of depression than kids under 2 hours. 7 Movement changes mood, not just fitness. Only 1 in 5 kids ages 6–17 meet the CDC's 60-minutes-a-day activity guideline. 8 In kids with ADHD specifically, exercise measurably improves anxiety, depression, and emotional regulation — not just attention. 9 💪 What to do: my personal protocol This is what we do at home. I don't hit 100% on any of it but I do my best every day. 1️⃣ Food is foundational. We cook roughly 80% of our kids' meals ourselves, including packed lunches, even though school provides one. Every meal, when we can: protein, a vegetable or fruit, fiber, a real fat like olive oil. Don't let perfect be the enemy of good — 80% home-cooked is enough of a buffer for the 20% that's cake and Cheetos. Teach your kids to read food labels. We like the Yuka app. Once they can see what’s in a food I’ve found they start getting curious making their own good choices. 2️⃣ Screens off by default. Movement on by default. No iPad, no TV, no devices — we use a projector that’s disconnected from the Wi-Fi most of the week except a short list of shows on weekends: PBS Kids, Disney+, nothing else. We walk to the subway instead of driving, morning and afternoon, rain or shine. Public school in NYC means a small campus and not much built-in PE, so sports and after-school programs fill the rest. 3️⃣ Fix what's under your own roof, not the whole world. We swapped nonstick pans for ceramic ones (Caraway), cleaning products for fragrance-free brands — Branch Basics, Seventh Generation, Molly's Suds for laundry — and stopped using soap on the kids most nights: just coconut oil in the bathwater, real shampoo once a week. Their toothpaste is Risewell. Next up: an RO filter for the water. You can't control the soap in the airport bathroom. You can control what's under your own sink. 4️⃣ Support the nervous system, then check the biology. I meditate with our kids most mornings, and we use the same tools with them that we use on ourselves: breathwork, naming what you're feeling out loud, moving our bodies to move the emotion. When something's wrong beyond that, we test instead of guess. My son had ADHD and eczema that wouldn't quit — food sensitivity testing found a low-grade egg allergy. We cut eggs. The eczema disappeared. Gut microbiome testing later turned up dysbiosis tied to his ADHD symptoms; treating it, along with a palette expander that fixed his mouth breathing and a behavioral therapist at NYU have improved his behavior. Targeted supplements when indicated: methylated B vitamins (we carry the MTHFR variant), omega-3s, magnesium glycinate, D3/K2 daily, probiotics when they have a stomach bug, for all three kids. By age 10, get a baseline: heavy metals, nutrient levels, omega-3 index, inflammation — once, as a reference point, and then every 2 years or more frequently if they have any health issues. The goal: My aim here is not “balance.” It’s to build a healthy baseline for my kids that’s strong enough to absorb a birthday party, a screen at a friend's house, and a world I don't control. While still giving them permission to enjoy the party, the ice cream or the latest cultural moment. 💛 The Momgevity Files Being a parent is hard. We all want the best for our kids, and it feels like the world is conspiring against us half the time. The media. The food industry. The tech industry. Schools without enough PE. A government that leaves protecting our kids' health mostly up to us. And let's be honest, the cost of everything just keeps going up. You want to give your kids the best. But you also have to be realistic. For me, unsurprisingly, health is a top priority. And finding the sweet spot between my inner health nut and needing to just "chill out, mom" isn't always obvious. So I stopped trying. My M.O. has basically been to live the life I want to live, buy the products I want to buy, eat the way I want to eat, and ignore the peer pressure of the world around me. If I immerse my children in the way I live around health — focused on it but not anxious about it — they'll absorb the right perspectives by osmosis, ones that will carry them one day when they're on their own. This means we don't eat like other families, I have stricter rules at an arcade or the ninja gym about snacks, and our birthday parties have real food and no juice boxes. When I say no to something and get told I'm a "mean mom!" I say yes, yes I am mean. I am SO MEAN. LOL. And I'm still not saying yes to anything with high fructose corn syrup. Our longevity is made up of the small decisions we make every day — the ones that become the rule, not the exception. And if this way of living is working for me — and it is, per my bloodwork and my DEXA — then it will for my kids too. As adults, we're in some ways our own parents first, after all. So here's permission to take care of yourself well, without the guilt, and to let your kids imitate you one day in ways you couldn't have imagined. References CDC/NCHS, 2023 CDC, 2024 MMWR/ADDM, 2024 Pediatric Research, 2026 Journal of Developmental & Behavioral Pediatrics, 2004 Frontiers in Toxicology, 2025 Cross-sectional study, 2024 MMWR, 2024 Systematic review and meta-analysis, 2025 Originally published in the Off Script newsletter. Join Robin’s readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Your Nervous System Is a Fertility Organ
URL: https://www.robinberzinmd.com/nervous-system-fertility-organ/
Updated: 2026-06-26 · Topics: Fertility & Parenting
Summary: Stress does not just make conception harder. It changes the hormonal environment your egg needs to mature.
Stress doesn't just make conception harder. It changes the hormonal environment your egg needs to mature. I've had patients get pregnant the month they stopped trying. The month they left a stressful job. After a vacation. After starting therapy. And I used to dismiss this as coincidence. Now I know the science. The HPA axis — the stress response system — and the HPO axis — the hormonal control center for ovulation — are deeply interconnected. Chronic stress doesn't just feel bad. It literally suppresses the hormonal cascade that drives ovulation, implantation, and the luteal phase support a pregnancy needs to stick. This is one of the most under-addressed drivers of unexplained infertility I see. And the most personal. 💡 Forward this protocol Chronic stress elevates cortisol, which suppresses LH, progesterone, and the entire hormonal cascade that makes conception possible. The intervention isn't "relax more." It's specific, physiological down-regulation. The Nervous System Fertility Protocol: 30 minutes of awake restoration daily — yoga nidra, NSDR, box breathing, or restorative yoga (not scrolling, not Netflix — true rest) Phosphatidylserine 200–400mg daily — clinically shown to blunt the cortisol stress response Strength training 2–3x per week (not high-intensity daily cardio — that raises cortisol) Consistent sleep and wake times within a 30-minute window every day 👉 Forward this to a friend who keeps hearing "just relax" — and deserves an actual protocol. 🤓 What to know: cortisol is an anti-fertility hormone ❌ The old assumption: Stress affects fertility emotionally. It makes the process harder to tolerate — but doesn't actually affect the biology. ✅ The new reality: Cortisol and the reproductive hormones share the same precursor — pregnenolone. Under chronic stress, the body preferentially produces cortisol over progesterone. And elevated cortisol directly suppresses GnRH pulsatility — the hypothalamic signal that starts the entire ovulation cascade. Less GnRH → blunted LH surge → anovulation, even with a regular-looking cycle. Women with severe depressive symptoms had a 38% lower per-cycle probability of conception — independent of medication use or behavior. 🧠 What elevated cortisol actually does to ovulation Stress-induced cortisol reduces GnRH pulse frequency and blunts pituitary responsiveness to GnRH. This is well-established in both animal models and functional hypothalamic amenorrhea research in women (Reproduction, 2016). The result can be anovulatory cycles that still look regular on the outside. A normal period does not confirm ovulation. 💔 Depression, anxiety, and time to conception Severe depressive symptoms were associated with a 38% decrease in per-cycle conception probability in a large prospective preconception cohort — and the effect held regardless of whether women were on psychotropic medication (American Journal of Obstetrics and Gynecology, 2016). Treating depression isn't just about mental health. It's part of the fertility protocol. 😴 Sleep is a reproductive hormone signal Melatonin — produced during sleep — acts as a direct antioxidant inside the follicle, protecting eggs from oxidative damage during maturation. Poor sleep raises cortisol, lowers melatonin, and disrupts the circadian signaling that regulates FSH and LH release. Sleep is not a nice-to-have. It's part of the protocol. 💪 What to do: regulate your nervous system as a fertility intervention 1️⃣ Make 30 minutes of daily restoration non-negotiable. Not passive relaxation. Specific, deliberate nervous system down-regulation. NSDR (non-sleep deep rest) and yoga nidra show measurable reductions in cortisol and improvements in parasympathetic tone. Insight Timer (free): search "yoga nidra" or "NSDR" Schedule it like a medical appointment — because it is one 2️⃣ Address anxiety and depression up front — not as an afterthought. If you're experiencing significant anxiety or depression while trying to conceive, this is a clinical issue that deserves clinical attention. Work with a therapist, fertility-informed coach, or psychiatrist who understands the preconception window. The data is clear: severe depressive symptoms meaningfully reduce per-cycle conception probability. Getting treated is part of the fertility plan. 3️⃣ Reframe your exercise — more intense isn't better right now. Excessive endurance exercise — long daily runs, aggressive HIIT every day — raises cortisol and can suppress ovulation. The sweet spot: Strength training 2–3x per week Yoga 2–3x per week Zone 2 cardio 90–150 minutes per week (brisk walking, light cycling) Avoid training that leaves you feeling maxed and depleted 4️⃣ Support the HPA axis with targeted supplements. Phosphatidylserine 200–400mg daily — clinically shown to blunt cortisol response without sedation. Safe through conception. Magnesium glycinate 300–400mg at night — lowers cortisol, improves sleep quality, supports progesterone production L-theanine 200mg — promotes calm focus, smooths cortisol spikes. Avoid high-dose ashwagandha in the active conception window (insufficient safety data) 5️⃣ Sleep consistency is a hormone protocol. Aim for the same bedtime and wake time within a 30-minute window — every day, including weekends. Circadian rhythm disruption suppresses melatonin and disrupts the FSH/LH release patterns that govern follicle development. Consistency beats perfection. 6️⃣ Journal the emotional layer — not just the physical. The fertility journey activates grief, perfectionism, relationship stress, and identity questions that are real and deserve space. A daily 10-minute free-write on fears, beliefs, and hopes around conception isn't woo — it's a tool for reducing the chronic low-grade anxiety that may be suppressing your reproductive hormones without you realizing it. The goal: a nervous system in parasympathetic dominance — so your body gets the signal that it's safe to conceive. Does this resonate? Hit reply. This is one I genuinely want to hear from you about. ⚡ One more thing... In my practice, I assess HPA axis function — cortisol patterns, progesterone, adrenal markers — as part of every fertility workup. If stress is part of your fertility story, I want to see it in the data and treat it accordingly. Stay strong, stay curious, remember to breathe, Robin 💡 Forward this to someone navigating infertility who's been told to "just relax" — and deserves better than that. Was this forwarded to you? Join our newsletter → As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The Chemicals in Your Home Are Affecting Your Fertility
URL: https://www.robinberzinmd.com/chemicals-in-your-home-fertility/
Updated: 2026-06-25 · Topics: Fertility & Parenting
Summary: PFAS, phthalates, and BPA are measurable in most of our bodies — and they directly impair egg quality.
PFAS, phthalates, and BPA aren't just environmental buzzwords — they're measurable, they're in most of our bodies, and they directly impair egg quality. I switched out every piece of non-stick cookware in my home years ago. I also green’ed my cleaning products. Ditched my plastic food containers. Even updated my makeup. People thought I was being a little extreme. Then I started running toxin panels on patients trying to conceive — and seeing what was actually in their bodies. PFAS. Phthalates. Heavy metals. In nearly everyone. Including women eating well, exercising, doing everything right. At least 97% of Americans have detectable PFAS — the "forever chemicals" — in their blood. And higher PFAS exposure is associated with up to a 40% reduction in the likelihood of clinical pregnancy and live birth. That's not a small signal. That's a real fertility disruptor hiding in plain sight. 💡 Forward this protocol You can't eliminate all toxin exposure. But you can dramatically reduce your body burden — and the research shows it moves the needle on fertility outcomes. The Fertility Toxin Audit (start today): Swap all plastic food storage for glass or stainless steel Replace non-stick cookware with cast iron or ceramic Filter your drinking water (reverse osmosis or solid carbon block) Check your makeup and skincare on EWG Skin Deep — aim for score 1–2 Switch laundry and cleaning products to brands like Branch Basics or Molly's Suds Eliminate synthetic fragrance and “parfum” from everything (it's a phthalate delivery system) 👉 Forward this to a woman trying to conceive who's never thought about her toxin load. 🤓 What to know: your home environment is a fertility factor ❌ The old assumption: Toxin exposure is a problem for people who work in industrial settings. Clean living = low exposure. ✅ The new reality: BPA, phthalates, PFAS, and heavy metals are pervasive in everyday household products — and they accumulate in ovarian tissue, disrupt hormones, and impair egg quality at concentrations well within typical American exposure ranges. Higher PFAS exposure was associated with a 30–40% reduction in the likelihood of clinical pregnancy and live birth — in women simply trying to conceive, not just in IVF. 🧪 How these chemicals disrupt fertility Phthalates and BPA are endocrine disruptors — they bind to estrogen receptors, blocking or mimicking your own hormones. This disrupts the LH surge, impairs follicle development, and degrades oocyte maturation. For each log unit increase in urinary BPA, women undergoing IVF had a 12% decrease in the number of eggs retrieved (International Journal of Andrology, 2010). 🥚 Heavy metals and egg quality Lead and mercury accumulate in ovarian tissue and are directly toxic to mitochondrial function in the egg — the energy machinery that drives fertilization and early cell division. Even low-to-moderate blood lead levels are associated with ovarian dysfunction and impaired fertility in women (Environmental Research, 2005). 🔥 PFAS and the pregnancy data In a population-based preconception cohort of women actively trying to conceive, higher blood PFAS levels were associated with a 30–40% reduction in the likelihood of clinical pregnancy and live birth per quartile increase in the PFAS mixture (Science of the Total Environment, 2023). These are not IVF patients. These are women trying naturally. 💪 What to do: reduce your body burden 1️⃣ Audit your kitchen first — it's the highest-impact swap. Non-stick cookware leaches PFAS when heated. Plastic containers leach BPA and phthalates into food, especially when warm or acidic. Switch to: Cast iron or ceramic cookware Glass containers for all food storage and reheating No plastic takeout containers — transfer to glass immediately and ideally avoid to begin with 2️⃣ Filter your water. Tap water in most US cities contains detectable PFAS, chlorine byproducts, and heavy metals. A reverse osmosis filter or solid carbon block filter removes the majority of these. This is one of the highest-ROI swaps you can make. 3️⃣ Clean up your beauty routine. Conventional makeup and skincare are significant phthalate sources — especially anything with synthetic fragrance. Check everything at EWG Skin Deep. Cleaner swaps I recommend: Merit, ILIA, RMS Beauty. Replace conventional face cream and sunscreen first. 4️⃣ Add sauna — it works. Sweat contains measurable concentrations of phthalates, BPA, and heavy metals — often at higher concentrations than urine. 2–3 infrared sauna sessions per week can meaningfully reduce body burden. Critical: shower immediately after every session so toxins don't reabsorb through the skin. Start at 15 minutes / lower heat if you're new Add electrolytes on sauna days Infrared preferred over traditional 5️⃣ Support your detox pathways with targeted supplements. Liposomal glutathione 500–700mg daily — the body's master antioxidant, supports liver detox and protects eggs from oxidative damage Psyllium husk 5–10g daily in water — binds toxins and excess estrogen in the gut, prevents reabsorption 6️⃣ Consider a toxin panel to know your actual burden. Vibrant America's toxin panel measures PFAS, phthalates, metals, and plastics in your blood. Most women are surprised by what comes back — but knowing lets you prioritize. In my practice, I run this for anyone in a fertility prep program. The goal: lower your total toxic body burden in the 3–4 months before you try to conceive. Does this resonate? Hit reply. ⚡ One more thing... In my practice, a full toxin panel — PFAS, heavy metals, plastics — is part of every fertility prep workup. Most women have never seen this data. And most of them are motivated to make real changes once they do. Stay strong, stay curious, remember to breathe, Robin 💡 Forward this to anyone trying to conceive — this is the conversation nobody is having at standard OB appointments. Was this forwarded to you? Join our newsletter → As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is Your Blood Sugar Killing Your Fertility?
URL: https://www.robinberzinmd.com/blood-sugar-fertility/
Updated: 2026-06-24 · Topics: Fertility & Parenting
Summary: Your metabolism and your ovaries are in constant conversation — and most women have no idea.
Your metabolism and your ovaries are in constant conversation — and most women have no idea. I see this all the time in my practice. A woman comes in with unexplained infertility. Her FSH looks fine. Her AMH is decent. Her OB says everything looks normal. But her fasting insulin is 18. Her HbA1c is 5.6. And nobody has connected the dots. Metabolic dysfunction is one of the most common — and most correctable — drivers of impaired fertility I see. And most conventional fertility workups don't even test for it. Here's what the research actually shows. 💡 Forward this protocol Insulin resistance silently disrupts ovulation, egg quality, and implantation — often before any cycle irregularity appears. The Metabolic Fertility Reset: Eat protein first at every meal (25–35g) to blunt glucose spikes Cut all added sugar to under 25g/day — including "healthy" sweeteners Do a 10-minute walk after your largest meal to lower postprandial glucose Get a 2-week CGM (continuous glucose monitor) to see your real-time blood sugar response 👉 Forward this to a friend who's been told her fertility workup is "normal" — but nobody checked her metabolic health. 🤓 What to know: insulin resistance is a fertility issue, not just a weight issue ❌ The old assumption: Metabolic dysfunction and PCOS only affect women who are overweight or have irregular cycles. ✅ The new reality: Insulin resistance affects lean women with PCOS too — and it impairs fertility independent of body weight. A systematic review found a 27% intrinsic reduction in insulin sensitivity in PCOS patients regardless of BMI (Human Reproduction, 2016). You can look normal on a standard panel and still be metabolically impaired. Insulin resistance disrupts the HPO axis — the hormonal control center for ovulation — even when cycles appear regular. 🩸 How insulin hijacks your hormones Elevated insulin tells your ovaries to produce more androgens (testosterone, DHEA). That surge suppresses ovulation, impairs egg maturation, and degrades uterine lining quality. It also flattens the natural LH surge that triggers ovulation — even in women who don't "have PCOS." 🥚 What this does to egg quality Eggs are the most mitochondria-dense cells in the body. In lean, non-PCOS women with insulin resistance, the percentage of mature oocytes and blastocyst formation rate were both significantly lower than in women without IR (Frontiers in Endocrinology, 2021). This isn't just a PCOS problem. 🧬 Blood sugar and implantation Even after fertilization, the uterine environment matters. Insulin resistance is associated with impaired endometrial receptivity — the lining's ability to accept an embryo. Correcting IR before IVF significantly improved live birth rates in one retrospective cohort (Human Reproduction, 2025). 💪 What to do: stabilize glucose, restore healthy ovulation 1️⃣ Get the right labs — not just the standard ones. Ask for fasting insulin (not just fasting glucose), HbA1c, and fructosamine. A fasting insulin above 10 µIU/mL is a signal, even if glucose looks normal. In my practice, I also look at the Omega-3 index and hsCRP as metabolic inflammation markers. 2️⃣ Prioritize protein at every meal — especially your first. Aim for 25–35g protein per meal. Protein first stabilizes the cortisol and glucose spike that happens in the morning, which sets the hormonal tone for the entire day. Eggs + smoked salmon Greek yogurt + hemp seeds + berries Leftover chicken or steak with vegetables 3️⃣ Cut the sugar — including the sneaky sources. Under 25g added sugar daily. That means reading labels on yogurt, granola, "healthy" sauces, and protein bars. Sweetened coffee drinks often contain 30–40g in one serving. 4️⃣ Move after meals. A 10-minute walk after eating meaningfully lowers postprandial glucose — as effectively as a 30-minute session in some studies (Sports Medicine, 2022). This is the simplest metabolic intervention there is. No gym required. 5️⃣ Consider a CGM. Two weeks of continuous glucose monitoring will show you which foods spike your blood sugar, how your stress affects glucose, and whether your overnight fasting glucose is truly stable. This is data your doctor will never get from a fasting lab draw alone. 6️⃣ Add targeted supplements if indicated. Inositol at a 40:1 myo/D-chiro ratio — a clinical trial found this ratio best restored ovulation and normalized LH, testosterone, and insulin in PCOS patients (European Review of Medical and Pharmacological Sciences, 2019) Magnesium glycinate 300mg at night — improves insulin sensitivity and sleep quality Berberine 500mg 2–3x daily with meals — if labs show clear insulin resistance and you're not yet pregnant The goal: stable blood sugar, regular ovulation, a follicular environment where egg quality can thrive. Does this resonate? Hit reply — I read every response. ⚡ One more thing... The first thing I do for any woman trying to conceive is run a complete metabolic picture — fasting insulin, HbA1c, Omega-3 index, hsCRP, and a full hormone panel timed to her cycle. Not a basic OB workup. A functional medicine workup that actually finds what's driving the problem. Stay strong, stay curious, remember to breathe, Robin 💡 Forward this to someone who's been told everything looks "normal" — and knows something is off. Was this forwarded to you? Join our newsletter → As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to Choose a Protein Powder That Actually Works
URL: https://www.robinberzinmd.com/protein-powder-guide-complete-protein/
Updated: 2026-05-04 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I make a protein smoothie 4–5 times a week. Here’s what most people — and a major smoothie chain CEO — don’t know about what’s actually in their powder.
I make a protein smoothie 4 to 5 times a week. It’s basically non-negotiable at this point — to break my intermittent fast, or as a snack to hit my protein goals for the day. I know I’m not alone. Robin’s Short Version Most plant protein powders on the market don’t do this. They are not complete proteins. Organic plant proteins actually had three times more lead than conventional in Clean Label Project testing. Organic certification doesn’t protect against heavy metals. Third-party tested does. Female skin loses approximately 30% of its collagen in the first five years after menopause — so this matters more as we age. So when recently I was on the phone with the CEO of a very well-known national smoothie chain — one you definitely know — and asked him: does your vegan protein powder have added BCAAs to make it a complete protein? … and he had no idea what I was talking about, I was shocked and kind of appalled. This is the problem. At a moment when Starbucks is offering protein boosters in your coffee, and when everyone is suddenly obsessed with protein — for good reason, it’s one of the most powerful longevity levers we have — the quality of what we’re consuming is getting almost zero attention. And the stakes are real. 📊 Research finding A 2025 Consumer Reports investigation found that more than two-thirds of popular protein powders contained lead levels exceeding what safety experts consider safe for a single day — some by more than 10 times. Meanwhile, most vegan protein powders being scooped into smoothies at juice bars and gyms across the country aren’t even complete proteins — meaning they can’t effectively build the muscle you’re counting on them to build. This week: a no-nonsense guide to choosing a protein powder that actually works. If you want a personalized protein strategy — how much, what type, when — book a consult with a Parsley clinician → 🤓 What to know: protein powders are not regulated — and quality varies wildly ❌ The old assumption: Protein is protein. As long as the label says 20 grams, you’re good. ✅ The new reality: The type of protein, whether it’s complete, how it’s sourced, and whether it’s been independently tested for safety vary enormously. The FDA does not review or approve protein powders before they hit the market. It’s on you to know what you’re buying. 🥛 Whey: the best-studied option for muscle Whey comes from dairy — it’s a byproduct of cheesemaking. It’s a complete protein, naturally high in leucine (the amino acid that triggers muscle protein synthesis ), and digests quickly. The research on whey for muscle building is extensive and consistent. Two forms to know: Isolate (90%+ protein, very low lactose) — better if you’re dairy-sensitive Concentrate (70–80% protein, more naturally occurring fats and immune factors) — fine if you tolerate dairy well For sourcing: choose grass-fed when possible. It matters for the overall quality of the dairy and avoids synthetic hormones (rBGH/rBST). 🌱 Vegan/plant-based: pea + rice, but only if it’s optimized This is what I use — Parsley’s Rebuild , a pea and rice blend. Done right, a pea-rice blend performs comparably to whey for muscle building [1] . Here’s what most people — including that smoothie chain CEO — don’t know: Pea protein alone is low in methionine. Rice protein alone is low in lysine. Together, they cover each other’s gaps. But the blend also needs added BCAAs, particularly leucine, to reach the threshold for triggering muscle protein synthesis. Most plant protein powders on the market don’t do this. They are not complete proteins. The label won’t always tell you clearly — look for "added BCAAs," "leucine fortified," or a BCAA content listed in the nutrition panel. If you’re relying on them to build muscle, you may not be getting what you think. 🦴 Collagen: real benefits — but not for muscle Collagen is not a complete protein. It’s missing tryptophan entirely and is low in several other essential amino acids — which means it cannot effectively trigger muscle protein synthesis on its own. What it is genuinely good for: skin elasticity, joint pain, tendon health. A 2025 meta-analysis of 11 studies found collagen supplementation led to significant improvements in pain and function in people with knee symptoms [2] . Female skin loses approximately 30% of its collagen in the first five years after menopause — so this matters more as we age. Use collagen as an add-on, not a replacement. 10–15g daily alongside your complete protein, ideally with vitamin C to support absorption. ☠️ Heavy metals: real concern, solvable problem Plants pull heavy metals from soil — it’s not specific to protein powder, it’s the same reason we find trace metals in rice, dark chocolate, and root vegetables. But the concentration process involved in making powders can amplify this. The 2025 Consumer Reports investigation found plant-based powders had, on average, nine times more lead than dairy-based ones. Chocolate plant protein was the worst combination. None of the products tested were at levels causing immediate harm — the concern is chronic daily exposure over months and years. The solution: third-party tested brands. Not "organic" — organic plant proteins actually had three times more lead than conventional in Clean Label Project testing. Organic certification doesn’t protect against heavy metals. Third-party tested does. 💪 What to do: how to choose a protein powder that actually delivers 1️⃣ Confirm it’s a complete protein. Before anything else. Does this powder contain all 9 essential amino acids in meaningful amounts? Whey: yes, always. Single-source plant proteins (pea only, rice only, hemp only): usually not. Pea + rice blend with added BCAAs: yes, if optimized. Check the label explicitly for BCAA content or leucine fortification — don’t assume. 2️⃣ Look for third-party testing certification. This is non-negotiable for me. The certifications that mean something: NSF Certified for Sport — tests for contaminants, label accuracy, and banned substances; the gold standard Informed Sport — rigorous, independently blind-tested Clean Label Project certified — specific focus on heavy metals and environmental contaminants If a brand publishes its Certificate of Analysis (COA) online for every batch, that’s a strong additional signal. If you can’t find any testing data, that tells you something. 3️⃣ Aim for 20–26g complete protein per serving. 📊 Research benchmark Research supports 20–26g complete protein per serving for triggering muscle protein synthesis [1] . If a scoop delivers 12–15g of incomplete protein, you’re not getting the muscle-building signal you need. 4️⃣ Add collagen as a complement if it fits your goals. If you’re in peri- or post-menopause, doing heavy training, or dealing with joint or skin concerns, 10–15g of hydrolyzed collagen peptides daily is worth adding — on top of, not instead of, your complete protein. Take it with vitamin C to support synthesis. One I trust: Ancient + Brave True Collagen — grass-fed bovine, hydrolyzed peptides under 5000Da for maximum absorption, tasteless and odorless (dissolves into anything). 5️⃣ Know what you’re getting at smoothie bars. Most juice bars and smoothie chains use bulk protein powder with zero third-party testing. If they offer a vegan option, there’s a strong chance it’s not a complete protein. Ask — and if the person behind the counter doesn’t know, that’s your answer. Consider bringing your own when it matters to you. 6️⃣ A few brands I trust (beyond Rebuild). If you’re looking for options beyond Parsley’s Rebuild, here are three that meet the criteria above — complete protein, independently tested, clean sourcing: Momentous Grass-Fed Whey Isolate (whey) — One of the only powders that is both NSF Certified for Sport and Informed Sport certified. Sourced from grass-fed European dairy, cold-processed, no artificial anything, publishes COAs for every batch. 20g per serving. Transparent Labs Grass-Fed Whey Isolate (whey) — Verified safe in Consumer Reports’ 2025 testing. Publishes all third-party test results publicly. Grass-fed, no artificial sweeteners, dyes, or fillers. ~28g per serving. Garden of Life SPORT Organic Plant-Based Protein (vegan) — NSF Certified for Sport and Informed Choice certified — double-certified, which is rare for a plant protein. 30g protein per serving from a multi-source blend (peas, navy beans, lentils, garbanzo beans) with 5g+ BCAAs. USDA Organic, no soy, no artificial additives. The goal: you don’t need the fanciest powder on the market. You need a complete one, properly dosed, from a brand that tests what’s in it. Does this resonate? Hit reply — I’d love to know what powder you’re currently using. 💛 The Momgevity Files A good friend asked me to prescribe her a GLP-1 this week. And I did, without much hesitation. She’s a mom of three in her 40s — like me. Not meaningfully overweight, but she said: "Everyone is on them and everyone looks so good. I want to lose the 10 lbs I can’t seem to shake before a big event in a few months." I gave her the usual speech: prioritize protein, add weight training, get her dermatologist checks, run labs for thyroid, sex hormones, blood sugar, and heart health, do a full-body DEXA. Our team helped her get her first dose of Mounjaro/Zepbound within a couple of days. Afterwards, I found myself wondering — was that the right thing to do? She eats healthy-ish, travels a lot, drinks socially, works hard, and doesn’t exercise as much as she’d like. Her diet, let’s be honest, is more gluten-free pretzels than wild salmon. No judgment — just facts. So the GLP-1 will probably help her lose the weight. But will she actually be healthier? I also started wondering what we’ll think about this moment in 20 years. Will we all be on GLP-1s? Will women everywhere be thin but frail, having lost bone and muscle mass over decades as a side effect? Will newer versions of these drugs be more fat-specific and protect us from that outcome? And what will we have lost — mentally, emotionally, physiologically — by outsourcing our metabolic health to a pill or a shot, instead of to exercise, sleep, and food? I think about my sophomore year of college. I was at my thinnest — dangerously so — in the wake of my first major heartbreak, living on Diet Coke and crackers. I was also, by far, my most unhappy. The things I do today to stay fit, at optimal fat, bone, and muscle mass — to be metabolically healthy — have side effects I wouldn’t trade for anything. Exercise clears my head, moves my digestion, helps me sleep, and keeps anxiety at bay. Eating with a focus on protein, fiber, and healthy fats balances my sex hormones, keeps my cycles regular, gives me consistent energy, and keeps my skin and body feeling good. Sleep keeps my brain sharp, my mood stable, my focus clear. All of these things serve my longevity and healthspan far beyond anything a number on the scale — or on the inside of my jeans — can account for. The human body is miraculous. Still the most impressive machine ever built — more sophisticated in its intelligence than any AI large language model. As we find new ways to make it look exactly how we want on the outside, let’s not forget to pay attention to what’s happening on the inside too. Stay strong, stay curious, and breathe, Robin ⚡ One more thing… The protein powder I use is Parsley’s Rebuild — a pea and rice blend optimized with BCAAs to form a complete protein, with 26g per serving, a complete multivitamin built in, and gut-healing properties. It’s what goes in my smoothie every morning. If you want help dialing in your total protein strategy, book a consult with a Parsley clinician . Frequently Asked Questions Is vegan protein powder as good as whey for building muscle? It can be — but only if it’s optimized. A pea and rice blend performs comparably to whey for muscle building, but the blend also needs added BCAAs, particularly leucine, to reach the threshold for triggering muscle protein synthesis. Most plant protein powders on the market don’t do this, so check the label explicitly for BCAA content or leucine fortification before assuming it qualifies as a complete protein. How much protein powder should I take per serving to build muscle? Research supports 20–26g complete protein per serving for triggering muscle protein synthesis. If a scoop delivers 12–15g of incomplete protein, you’re not getting the muscle-building signal you need — so both the amount and the completeness of the protein matter. Are protein powders safe — what about heavy metals? The concern is real but solvable. A 2025 Consumer Reports investigation found plant-based powders had, on average, nine times more lead than dairy-based ones, and the concern is chronic daily exposure over months and years — not immediate harm. The solution is to choose brands with NSF Certified for Sport, Informed Sport, or Clean Label Project certification — and note that organic certification does NOT protect against heavy metals. Can I use collagen as my main protein powder? No — collagen is not a complete protein. It’s missing tryptophan entirely and is low in several other essential amino acids, which means it cannot effectively trigger muscle protein synthesis on its own. Use it as an add-on of 10–15g daily alongside your complete protein, ideally with vitamin C to support absorption, particularly if you’re dealing with joint pain, tendon health, or skin concerns. Scientific References Journal of the International Society of Sports Nutrition, 2015 — pea-rice blend comparable to whey for muscle building PMC, 2025 — collagen supplementation improved knee pain and function in meta-analysis Keep Reading Forget Weight—Muscle Mass Is the Real Longevity Metric. How Much Protein Should You Really Be Eating? My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## MTHFR mutations can cause anxiety, fatigue and fertility issues. You likely have one.
URL: https://www.robinberzinmd.com/mthfr/
Updated: 2026-05-03 · Topics: Fertility & Parenting, Women’s Health & Hormones
Summary: Knowing your genes, including MTHFR, can help you lower your disease risk, improve metabolic health, and overhaul your mental health.
How much do genetics really matter? Is nature more important than nurture? Should I do genetic testing or will it just tell me what my bloodwork already shows? Robin’s Short Version Surprisingly Common: More Americans carry an MTHFR variant than don’t, making it one of the most widespread actionable genetic factors in clinical practice. Homocysteine Danger: Low folate from MTHFR variants lets homocysteine accumulate, driving inflammation linked to heart disease and disrupting serotonin, dopamine, and GABA production. Methylation at Stake: Impaired methylation affects gene regulation, nutrient absorption, and your body’s ability to clear toxins like heavy metals from cells. I get these questions a lot. What we know about our genes is like a snowflake on the tip of an iceberg. That said, there are a few genetic variants I see matter a lot in daily practice. The one I hear patients and friends talking about the most is APOE for Alzheimer’s. But the gene I see having perhaps a more frequent impact, on everything from mental health to fertility, is MTHFR. MTHFR is an acronym for a gene in the body, and it’s a mouthful: methylenetetrahydrofolate reductase. Like all genes, you have two copies of MTHFR. Variants on one or both copies mean the resulting MTHFR enzyme is significantly less active, which can impair the body’s ability to process folate and increase levels of the amino acid homocysteine. MTHFR variants are wildly common—more people in the United States have one or two variants than don’t, according to the CDC . (Certain variations are more common in certain geographic regions. In Australia, for example, as many as 60-70% of people have at least one of the most common MTHFR variations. Globally, an estimated 25% of people have at least one MTHFR gene variation.) If MTHFR variations have the potential to cause health issues, why are they so common? At a certain point in our evolutionary history, they must have been adaptive. One hypothesis : certain MTHFR variations might have protected our ancestors from solar radiation. In our modern environment, however, MTHFR mutations are complicated. I personally have a double variant in one of my MTHFR genes. I know this because I did genetic testing when I was first training in functional medicine and it’s changed the way I approach my health. Here’s how: The research says A lot of genetic markers aren’t actionable. Variations on the ACTN3 (Alpha-Actinin-3) gene, for example, can influence whether your body is better suited to endurance exercise or power-based sports like sprinting. It’s good to know, but there’s likely nothing you can do to change that predisposition. But a lot of genetic variations are actionable. Knowing your genes can help you lower your disease risk, improve metabolic health, and overhaul your mental health. At Parsley we use advanced genetic tests to analyze how your genes affect metabolism and nutrient absorption, thyroid function and hormone metabolism, and anxiety and mood. Knowing you have an MTHFR variation is not only actionable, it can be hugely impactful for optimizing your nutrient intake and—potentially—lowering your disease risk. MTHFR variations can cause: Low levels of folate. Folate is essential for making and repairing DNA, neurotransmitter production, and supporting fetal development. Studies suggest that people with the C677T MTHFR polymorphism may have lower levels of folate and benefit from supplementation. (More on that later.) Folate deficiency can be the cause of fatigue, weakness, depression, and gastro issues. High levels of homocysteine. Low serum folate levels can lead to undesirably high levels of the amino acid homocysteine, which may cause two issues: increased inflammation, which is linked to a greater risk of heart disease, and impaired function of neurotransmitters (including serotonin, dopamine, and GABA), which is linked to decreased mood and cognitive function. Reduced methylation capacity. Methylation is your body’s ability to turn genes on and off, which is crucial for cell function, the proper absorption of nutrients, and your cells’ ability to process and eliminate toxins like heavy metals. Beyond these three issues, a large body of research has explored the downstream effects of MTHFR variations on increased risk of disease. But the evidence is often conflicting or inconclusive. So, what does that mean for your health? The following associations shouldn’t cause panic but could be a nudge to work with a functional medicine practice to assess your risk of certain diseases that may be impacted by MTHFR. For example, there is evidence that MTHFR mutations may play a role in: Preventable cardiovascular disease. The C677T MTHFR mutation is correlated with increased blood pressure and higher total cholesterol, LDL cholesterol and triglycerides. A 2021 study found these links plus an increase in markers of inflammation—all risk factors for cardiovascular disease. The development of certain types of cancers. Including breast cancer , colon cancer , and cervical cancer . Impaired fertility. At least some evidence has linked MTHFR mutations to recurrent pregnancy loss , male infertility , impaired IVF outcomes (including reduced oocyte maturation potential and poorer embryo quality), and diminished ovarian reserve . The evidence is not considered conclusive enough at present to warrant testing for MTHFR before trying to conceive. If you have concerns about a family history or recurrent losses, talk to your doctor about whether testing might make sense for you. Cognitive decline including Alzheimer’s and dementia. Elevated homocysteine levels have been associated in some studies with a higher risk of cognitive disease. But most meta-analyses find the link between MTHFR and long-term brain health to be either inconsistent or to vary widely across populations . Psychiatric disorders. Researchers are also investigating MTHFR mutations—specifically the C677T and A1298C polymorphisms—and psychiatric disorders. But again, the results aren’t consistent across all groups. One review of 81 studies published in Frontiers in Neuroscience in 2022, for example, found links between MTHFR mutations and major depressive disorder, bipolar disorder, and schizophrenia in Asian populations but not caucasians. Here’s what I take away: MTHFR is actionable and impacts your body’s ability to regulate mood, fully absorb nutrients, and rid itself of common toxins. When it comes to supporting optimal cell function, cognitive health, heart health, and fertility, MTHFR can have real-time impact for many of us. MTHFR may impact your risk of disease but that risk is highly individualized and is best assessed with the help of a functional medicine physician who can help you understand the whole picture of your health. What I’m doing for my own body Here’s how I used the knowledge of my MTHFR variants to improve my personal health: Detoxing heavy metals In my 30s as I was preparing to get pregnant, I learned I had bioaccumulated a lot of mercury (I was a big tuna eater in my 20s). I was taking in all this mercury, but likely because of my sluggish MTHFR-influenced detox pathways, I was not able to safely process and eliminate it (and other toxic heavy metals). I went through heavy metal detox, aka chelation therapy , before getting pregnant to help safely remove these metals from my system. Taking methylated supplements When I was in college, I took Zoloft for a year for mild depression. I haven’t taken medication since then, a shift I attribute mostly to my yoga and spirituality practice. But I also use what I’ve learned about the MTHFR variant to support my mental wellbeing. People with MTHFR variants have trouble converting inactive forms of folate and B12 found in many foods and supplements into their active, usable forms. Taking a methylated (i.e. active) form of these micronutrients bypasses any sluggishness of the MTHFR enzyme so that your body can use it. Most supplements on the market aren’t (including multivitamins) methylated. I take Parsley’s Daily Dose Multivitamin plus 1 milligram of methylated folate and 1mg of methylated B12 every day. When I don’t take the latter, the difference in my mood is remarkable. It helps with better focus, better clarity, and positivity. What I recommend for you The only way to know if you have an MTHFR variation is through a genetic blood test that looks for variations in the MTHFR gene. Come test with us at Parsley . Here’s what I recommend: Test your homocysteine levels This is another way to make an educated guess about your MTHFR gene. If your homocysteine levels are high, you likely have an MTHFR variant and would benefit from methylated supplementation for heart health. Optimize folate intake Supplementing with folic acid can help increase blood folate levels in patients with MTHFR variants. I recommend supplementing with 1 mg of a methylated form of folate (L-5-MTHF) to bypass the conversion issue. Support methylation pathways To support methylation pathways in the body (key for cell function, detoxing, and nutrient absorption) take B-complex vitamins with active forms of B12 (methylcobalamin or adenosylcobalamin). I recommend 1 mg for patients with MTHFR mutations. Since B12 is water soluble, you can take a higher dose—some people find 5 mg is even better for their mental clarity and mood while others find the higher dose agitating or too energizing. I don’t personally find that, but I also don’t find massive benefits from taking 5 mg vs. 1 mg. If you don’t know your MTHFR status, there is little downside to taking a methylated multi or prenatal vitamin and seeing how you feel. Occasionally, people report feeling agitated with methylated B vitamins, but it’s rare in my experience. If you feel that way, you can simply stop and take a non-methylated version. Make a prenatal plan I bias towards getting more information over less pre-pregnancy. I want to help patients optimize outcomes and have the healthiest pregnancies possible. So because MTHFR may have implications for fertility, I want to know about it as a physician. I recommend working with a functional medicine practitioner or fertility specialist to make a prenatal plan. That might include higher doses of methylfolate, which a lot of general prenatals don’t include. (One of the many reasons I love Ritual’s prenatal , which includes 1 mg 6S-5-methyltetrahydrofolate and 8 mcg methylcobalamin.) Set up a free consult call with my team at Parsley to learn about the genetic tests we offer as well as specialty tests to measure homocysteine levels and inflammation. Use my code RBMDCREW for $150 off your membership. Keep Reading Is estrogen the ultimate longevity drug? Brain, bones, booty: 3 things to take care of before you reach menopause. My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Bone Loss, Inflammation & Gut Health: The Missing Link
URL: https://www.robinberzinmd.com/bone-loss-inflammation-gut-health/
Updated: 2026-05-03 · Topics: Women’s Health & Hormones
Summary: I was diagnosed with osteopenia last year and discovered the third driver of bone loss most women never hear about: inflammation from visceral fat, and how the gut is the fix.
When I was diagnosed with osteopenia last year, I went deep on why women lose so much bone in midlife. I knew estrogen was part of it. What surprised me was the other driver: inflammation. Robin’s Short Version Even at a normal BMI, high visceral fat drives the chronic low-grade inflammation that accelerates bone resorption. The scale doesn’t tell you this. Body composition does. In a 12-month RCT of 286 postmenopausal women, a specific probiotic-prebiotic combination reduced bone loss at the femoral neck by 85% in women with osteopenia, and 74% at the hip in women with elevated BMI. Get a DEXA scan in your early 40s—not at 65 when the standard recommendation kicks in. By then, you’ve missed a decade of intervention. Specifically, the inflammation that comes from visceral fat—the belly fat that wraps around your organs. It’s metabolically active tissue that pumps out inflammatory signals 24/7, even in women who don’t gain weight on the scale. And as estrogen drops in perimenopause, it quietly accumulates in almost all of us. Before menopause, visceral fat makes up about 5–8% of total body fat. After? Up to 15–20%. [1] That inflammation talks directly to your bones and tips the balance toward breakdown. The good news: the microbiome is one of the most powerful levers we have to quiet it. This week I’m getting into the belly fat → inflammation → gut → bone loss connection, and how to protect your bones in midlife beyond just lifting weights. Diagnosed with osteopenia — or wondering if you should be tested? This is exactly the kind of thing I’d want to look at together: your estradiol, hsCRP, and body composition, not just your calcium intake. Let’s figure out what’s driving it → 🤓 What to know: Bones are an immune organ. ❌ The old framework: bone loss = estrogen decline + calcium deficiency. Both matter. But chronic inflammation is the missing variable. When the immune system is persistently activated, inflammatory cytokines (TNF-α, IL-6) stimulate osteoclasts—the cells that dissolve bone—and suppress osteoblasts, the cells that build it. ✅ Visceral fat is an inflammation engine. Unlike subcutaneous fat, visceral fat actively secretes TNF-α and IL-6 into circulation. Even at a normal BMI, high visceral fat drives the chronic low-grade inflammation that accelerates bone resorption . [2] The scale doesn’t tell you this. Body composition does. Even at a normal BMI, high visceral fat drives the chronic low-grade inflammation that accelerates bone resorption. The scale doesn’t tell you this. Body composition does. ✅ Estrogen loss makes it worse—through the gut. Estrogen helps maintain gut barrier integrity. As it drops in perimenopause, the gut becomes more permeable—letting bacterial fragments into circulation and amplifying systemic inflammation. Less estrogen → leakier gut → more inflammation → faster bone loss. [3] ✅ The right gut bacteria can slow the process. Certain strains of bacteria—particularly those that produce SCFAs and support tight-junction proteins in the gut wall—have been shown to reduce systemic inflammation markers and directly inhibit osteoclast activity. In a 12-month RCT of 286 postmenopausal women, a specific probiotic-prebiotic combination reduced bone loss at the femoral neck by 85% in women with osteopenia, and 74% at the hip in women with elevated BMI—on top of vitamin D supplementation in both groups. [4] The formulation used in that trial is Bondia . In a 12-month RCT of 286 postmenopausal women, a specific probiotic-prebiotic combination reduced bone loss at the femoral neck by 85% in women with osteopenia, and 74% at the hip in women with elevated BMI. 💪 What to do: Build your bone + gut protocol. Step 1: Reduce visceral fat—the less of it you have, the less inflamed you are. Zone 2 cardio 3–4x/week (30–45 min, conversational pace) Strength train 2–3x/week Cut added sugars Aim for 80g+ protein/day Step 2: Feed a healthy gut Eat 30+ different plant foods (fruits and veg) per week—variety over volume Add seeds, include legumes, prioritize whole grains over refined flours Limit alcohol and ibuprofen—both directly damage the gut barrier Step 3: Consider a synbiotic if you have osteopenia or elevated BMI Not all probiotic strains do the same thing. Look for formulations with clinical data specifically on bone and inflammation endpoints—not just general gut health claims. ⭐ If you do one thing: Get a DEXA scan in your early 40s—not at 65 when the standard recommendation kicks in. By then, you’ve missed a decade of intervention. 💛 The Momgevity Files This weekend I went to a very unconventional wedding in New Orleans. Friends of mine are deeply embedded in the art and culture scene there, and hosted a three-day celebration of their love for each other—and their city—with their community. The theme was Becoming Together. Elaborately costumed for each event, we floated from art galleries to garden parties to a showcase of performances by their incredibly talented friends. A literal dream. I went by myself. (Taking three kids on a trip like this is a non-starter, logistically and energetically—and my husband has a ski trip next week, so we traded off. I’m on duty next weekend!) In my early 40s, I find these solo moments rare and precious. Dressing up, dancing through the streets in a second line behind a brass band, eating breakfast pho at a bodega at the edge of town—I can do all of this with family, but with a lot more planning and a lot less spontaneity. A weekend like this was fuel for my heart. As I write this, I’m also exhausted. The late nights and hyper-socializing will require recovery. One of my kids is sick and I moved my flight up to make it home by bedtime. This week I’m taking it easy energetically—weights and Pilates yes, early bedtimes, home-cooked meals, and a few days before I get back to cardio. Worth every minute of it. I give myself a lot of permission at this stage of life. My mantra is stopping the clock without stopping my life. I see this moment as one of peak expansion—I want to experience as much as I can while being as present as possible for the experiences I’m having. A big theme of the weekend, naturally, was love. One of the artists shared a list of definitions that stayed with me. Love is kindness. Love is presence. Love is listening with warm eyes. Love is curiosity. Love is community. Love is creativity. Love is expression. Love is giving. Love is devotion. Love is letting go. Love is allowing yourself to become. It was a reminder that when it comes to longevity , we’re playing the long game—and we have permission right now to become the next version of ourselves, if we love ourselves enough to allow it. Does this match how you’re approaching recovery after a big weekend — or do you push straight through? Hit reply. ⚡ One more thing… My annual longevity labs with Parsley are one of the things I actually look forward to—because seeing your numbers motivates you to act on them. Book yours here or BYO labs and book a consult with a Parsley clinician for advanced analysis and a personalized plan. And if you’re interested in trying Bondia — use code BERZIN for 20% off. If you have osteopenia — or suspect you do — come talk to us. At Parsley we’d run your estradiol, hsCRP, and a DEXA-informed body composition panel together, and build a bone-protection protocol that addresses the inflammation piece, not just calcium and vitamin D. Talk to a Parsley provider → Stay strong, stay curious, and breathe, Robin Frequently Asked Questions What causes bone loss in women besides estrogen decline? Beyond estrogen, chronic inflammation is the missing variable most women aren’t thinking about. Visceral fat—the belly fat that wraps around your organs—actively secretes inflammatory cytokines like TNF-α and IL-6 that stimulate osteoclasts (the cells that dissolve bone) and suppress osteoblasts (the cells that build it). This can happen even at a normal BMI, which is why body composition tells you more than the scale. How does gut health affect bone density? As estrogen drops in perimenopause, the gut becomes more permeable—letting bacterial fragments into circulation and amplifying systemic inflammation, which in turn accelerates bone loss. The good news is that certain strains of gut bacteria that produce short-chain fatty acids have been shown to reduce systemic inflammation markers and directly inhibit osteoclast activity. Can probiotics actually reduce bone loss? Yes, there is clinical evidence for specific formulations. In a 12-month RCT of 286 postmenopausal women, a specific probiotic-prebiotic combination (synbiotic) reduced bone loss at the femoral neck by 85% in women with osteopenia, and 74% at the hip in women with elevated BMI—on top of vitamin D supplementation. The key is using formulations with clinical data specifically on bone and inflammation endpoints, not just general gut health claims. When should women get a DEXA scan for bone density? I recommend getting a DEXA scan in your early 40s—not at 65 when the standard recommendation kicks in. By 65, you’ve missed a decade of intervention. If you already have osteopenia, I’d want to look at your estradiol, hsCRP, and body composition together, not just your calcium intake. Scientific References Current Atherosclerosis Reports, 2022 — Visceral fat rises from 5–8% to 15–20% after menopause Obesity, 2016 — Visceral fat drives low-grade inflammation accelerating bone resorption Frontiers in Endocrinology, 2024 — Estrogen loss increases gut permeability and systemic inflammation Osteoporosis International, 2025 — Probiotic-prebiotic reduced femoral neck bone loss 85% in osteopenia RCT Keep Reading Your bone density blueprint Is estrogen the ultimate longevity drug? My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Normal Labs but Still Tired? 7 Root Causes
URL: https://www.robinberzinmd.com/normal-labs-fatigue-root-causes/
Updated: 2026-05-03 · Topics: Women’s Health & Hormones
Summary: Your labs came back normal. So why are you still exhausted? When I ran my friend’s labs, we found seven things. All subtle. None normal. Here’s what to test.
I’ve been living this question personally lately. I run at an 11 out of 10 — always have. But the past few months I’ve been getting clear signals from my body that something needs to give: fractured sleep, acne along my jaw, a fatigue that follows me even on good days. My own labs are telling a story I can’t ignore — lower testosterone and a single Hashimoto’s antibody that comes and goes. Robin’s Short Version Your hemoglobin can be completely normal while your iron stores are depleted. Fatigue, brain fog, and hair shedding all show up long before anemia does. A TSH of 3.8 is "normal." It may also be why you feel terrible. A 10-minute walk after meals reduces post-meal glucose spikes by up to 30%. I also have a close friend — brilliant, driven, early 40s — who joined Parsley recently because she was exhausted. Beyond new-baby exhausted. Bone-deep, nothing-is-working exhausted, two years postpartum. Her GP had chalked it up to "new mom fatigue." She knew something else was going on. When we ran her labs, we found seven things. All of them subtle. None of them normal. Jaw acne, fractured sleep, fatigue that follows you even on good days — your labs may look fine and still be telling a story. That’s exactly what I’d want to look at with you: your ferritin, free T3, fasting insulin, and cortisol curve. Let’s find what’s actually driving it → 🤓 What to know: "In range" is not the same as "optimal." ❌ The old assumption: If your bloodwork comes back normal, nothing is wrong. Reference ranges are built on population averages — including people who are already depleted or sick. "Normal" often just means "not in the worst 2.5% of results we’ve ever seen." That’s a very low bar. ✅ The gap between "not abnormal" and "feeling good" is where most midlife fatigue lives. Reference ranges were built on population averages — often including people who were already sick. For TSH, the conventional upper limit is 4.5 mIU/L. HUNT cohort data shows optimal function sits between 1.0–2.5. A TSH of 3.8 is "normal." It may also be why you feel terrible. The same gap exists across iron, blood sugar, cortisol, and inflammation. "In range" is not the same as "optimal." The gap between them is where most midlife fatigue lives. Here’s what to look for across all seven causes: 🩸 Low ferritin (iron without anemia) Your hemoglobin can be completely normal while your iron stores are depleted. Fatigue, brain fog, and hair shedding all show up long before anemia does. And here’s the connection most people miss: low ferritin blocks thyroid T4→T3 conversion. You can have hypothyroid symptoms with a perfectly normal TSH. What to test: Serum ferritin + full iron panel. Ask for transferrin saturation too — ferritin looks falsely normal when inflammation is present. [1] [2] 🦋 Thyroid dysfunction Women are 10x more likely than men to have Hashimoto’s . Perimenopause amplifies it. Chronic stress and low ferritin both impair thyroid hormone conversion — normal TSH doesn’t mean adequate active hormone. Optimal targets: TSH 1.0–2.5 mIU/L; Free T3 in upper half of range. TPO antibodies: negative. 🌡️ Cortisol dysregulation Chronic mental overload dysregulates your HPA axis. The result: cortisol too high at night (wired, can’t sleep), too flat in the morning (foggy, can’t get going). A 2024 study in Sleep [3] found higher pre-sleep cortisol predicted shorter sleep and lower efficiency. This is where I am right now. What to test: 4-point salivary cortisol (DUTCH test) + DHEA-S. Low DHEA-S = adrenal reserve depleted. 🍬 Insulin resistance (missed by years) Conventional normal for fasting glucose: under 100 mg/dL. Functional medicine optimal: under 85. Risk starts rising above 85 — well within "normal." 80% of people with prediabetes don’t know it. The symptoms? Fatigue, sugar cravings, afternoon crashes, stubborn weight. What to test: Fasting glucose + fasting insulin + HbA1c + HOMA-IR. Optimal fasting insulin: under 7 uIU/mL. If you want to see these numbers in real time, a CGM can reveal a lot about your metabolic health that a single fasting lab misses. 🔥 Chronic inflammation + low-grade autoimmune activity My patient friend had autoimmune antibodies — low-grade, not yet diagnosable, but her immune system was smoldering. hsCRP is a key marker. Conventional "normal": below 3.0 mg/L. Functional medicine optimal: below 0.5 mg/L. A level of 2.4 mg/L? Fine by labs. Also a driver of fatigue, brain fog, and biological aging — hsCRP is one of the 9 biomarkers in the PhenoAge algorithm. What to test: hsCRP + ANA panel + anti-tTG IgA (celiac) + Vitamin D + Homocysteine. Never-off, always-on chronic mental load shows up in labs. It’s not a personality trait. It’s a dysregulated stress response. ⚡ Mitochondrial decline Estrogen directly protects mitochondrial function. As it drops in perimenopause, ATP production drops too — independently of sleep, stress, or supplementation. Your cells are making less energy. That’s biological, not motivational. Best proxy markers: VO2 max (via wearable), fasting insulin, HbA1c. 🧠 Chronic mental overload The one no one talks about as a lab finding — but it leaves fingerprints everywhere: flat diurnal cortisol on DUTCH testing, elevated hsCRP, low DHEA-S, rising fasting glucose. Chronic stress drives HPA dysregulation, systemic inflammation, and sleep fragmentation simultaneously. It’s not a lifestyle complaint. It’s physiology. 💪 What to do: Get the right labs, then address the root. 1️⃣ Request a complete panel — not a standard one. Print this and bring it to your appointment (or book with Parsley and we’ll run it all): Serum ferritin + full iron panel + CBC TSH + Free T3 + Free T4 + Reverse T3 + TPO antibodies + TgAb Fasting glucose + fasting insulin + HbA1c hsCRP + ANA panel + anti-tTG IgA Vitamin D (25-OH), B12, Homocysteine 4-point salivary cortisol + DHEA-S (DUTCH test) KBMO food sensitivity panel + zonulin (leaky gut marker) This is also exactly the kind of comprehensive lab panel every woman should have access to — not just when she’s sick. 2️⃣ Fix iron first if ferritin is low. Form matters: iron bisglycinate absorbs 2–4x better than ferrous sulfate with fewer GI side effects. Take with vitamin C; avoid coffee and calcium within 2 hours. Recheck every 3 months — rebuilding stores takes 3–6 months. 3️⃣ Stabilize blood sugar — two habits, no prescription needed. 25–30g protein at every meal. A 10-minute walk after meals reduces post-meal glucose spikes by up to 30% (multiple RCTs). Start there before anything else. 4️⃣ Lower inflammation through the gut. If your hsCRP is elevated or you have low-grade autoimmune markers, food sensitivities and gut permeability are often the hidden driver. A KBMO food sensitivity + zonulin panel shows you what’s triggering your immune system and whether your gut barrier is compromised. From there, a 4–6 week elimination of your top reactive foods — typically gluten, dairy, eggs, and soy — is one of the most effective ways to lower systemic inflammation without a prescription. 5️⃣ Address the mental load like the clinical problem it is. Hard stop on work after 8pm — your cortisol arc needs 90–120 minutes to begin its natural decline before sleep. That racing mind at midnight isn’t who you are. It’s a dysregulated HPA axis showing up in every other marker on this list. For direct nervous system support: Apollo is a wearable that delivers gentle vibration frequencies shown to stimulate the vagus nerve and shift the body toward parasympathetic activity. Specific supplements can also help: Magnesium glycinate: 300–400mg at night — nervous system regulation + deep sleep L-theanine (100–200mg) + GABA (100–300mg) — for racing thoughts and sleep onset when cortisol is the driver ⭐ If you do one thing: Print the complete lab panel above and bring it to your next appointment — or book with Parsley and we’ll run it all and tell you what’s actually driving your fatigue. The goal: find the 1–2 root causes driving most of your fatigue — and fix them. 💛 The Momgevity Files Speaking of wired and tired — today’s newsletter hits home. For the past three months, my energetic engine light has been on red. The resilience is still there, but I actually have to look for it now. That’s new. So is this just midlife? Hormonal fluctuations, normal aging, my longevity protocols failing me? No. But I’m at risk of that becoming my story if I don’t address the real root cause: mental overload and cortisol dysregulation. I’ve always had a tremendous capacity for the yes-to-everything life. I still do. But that capacity comes in waves. And after ten years of riding a tsunami — startup life, three kids, a husband, an active social life — it’s time to float for a minute before the next swell comes. This is a moment to decompress, go inward, and ask what’s here to be revealed. The last time I did this was 2014. My husband got an opportunity to work in Europe for three months, and I quit my job at a functional medicine practice in NYC and went with him. No kids yet, just one dog we left with friends. On the other side of medical training, I had space to pause and reach into the unknown to create something new. The result was the idea for Parsley Health, which launched in beta the following year — and the clarity that I was ready for a family. This time I still have my day job. I’m still lifting weights, getting my DEXA scans, taking my supplements. But I’m also deliberately creating space to rest, drift, and listen. Learning to be pulled instead of pushing. Noticing when I’ve pushed too far. When I look back, the best things have always shown up when I allowed instead of gripped. Longevity in midlife, it turns out, is about letting myself be carried as much as I carry. ⚡ One more thing… If you want to go deeper on all of this in person — I’d love to see you at my first female longevity retreat this June in Topanga, CA. It’s nearly sold out but we have 2 or 3 spots left! Body Lab: A Female Healthspan Immersion is a limited-spot, curated experience I’m co-hosting with my longtime yoga teacher and friend Schuyler Grant. Strength, hormones, energy — from the inside out. Learn more and reserve your spot → Stay strong, stay curious, and breathe, Robin Frequently Asked Questions Can your labs look normal but you still have a thyroid problem? Yes — and this is one of the most common things I see. A TSH of 3.8 falls within conventional "normal" range, but HUNT cohort data shows optimal thyroid function sits between 1.0–2.5 mIU/L. A standard TSH alone tells you almost nothing about whether your thyroid is actually working — you need Free T3, Free T4, Reverse T3, and TPO antibodies to get the full picture. What ferritin level causes fatigue? Fatigue starts below ferritin 50 ng/mL, but most labs flag "normal" at anything above 11. Your hemoglobin can be completely normal while your iron stores are depleted — fatigue, brain fog, and hair shedding all show up long before anemia does. Always ask for serum ferritin plus a full iron panel, not just "iron levels." How do I lower inflammation without a prescription? If your hsCRP is elevated or you have low-grade autoimmune markers, food sensitivities and gut permeability are often the hidden driver. A 4–6 week elimination of your top reactive foods — typically gluten, dairy, eggs, and soy — is one of the most effective ways to lower systemic inflammation without a prescription. Getting a KBMO food sensitivity + zonulin panel first tells you exactly what to target. What labs should I ask for if I’m tired all the time? Request a complete panel: serum ferritin + full iron panel + CBC, TSH + Free T3 + Free T4 + Reverse T3 + TPO antibodies, fasting glucose + fasting insulin + HbA1c, hsCRP, Vitamin D, B12, Homocysteine, and a 4-point salivary cortisol + DHEA-S (DUTCH test). Print the full list from this post and bring it to your appointment — or book with Parsley and we’ll run it all. Scientific References ASH Education Program, 2023 — Iron deficiency without anemia: diagnosis and management JAMA, 2025 — Ferritin thresholds and fatigue in women of reproductive age Sleep, 2024 — Pre-sleep cortisol predicts shorter sleep duration and lower efficiency Keep Reading 100 Essential Labs Every Woman Should Be Tracking The Cortisol Reset Every Woman Needs My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Vaginal Estrogen: Prevention, Not Last Resort
URL: https://www.robinberzinmd.com/vaginal-estrogen-prevention-longevity/
Updated: 2026-05-03 · Topics: Women’s Health & Hormones
Summary: My grandmother didn’t have to suffer through chronic UTIs and sepsis. A $20/month cream could have changed everything — and the research now proves it.
Not just for dryness or for sex. For survival. I’ve been thinking about my grandmother a lot lately. She lived to 95, but the last years of her life were defined by something entirely preventable: chronic UTIs. Constant pain. Antibiotics on rotation that wrecked her gut and caused yeast infections. At some point, she needed a diaper. She didn’t have to be there. Robin’s Short Version New research shows a 73% reduction in mortality from UTI-related sepsis in postmenopausal women on vaginal estrogen vs. those who aren’t. Vaginal estrogen has negligible systemic absorption, no demonstrated risk of cancer or blood clots, and prevents the tissue decline that leads to UTIs, incontinence, and — at its worst — sepsis and death. Waiting for tissue to atrophy before treating it is like waiting for a fracture before doing bone density work. The routine application of vaginal estrogen cream — $20–$30 a month at a compounding pharmacy — may have changed everything. New research shows a 73% reduction in mortality from UTI-related sepsis in postmenopausal women on vaginal estrogen vs. those who aren’t [1] . From a cream. Twice a week. I believe every woman should start vaginal estrogen by 50 at the latest and take it for life. Not just when something goes wrong. Proactively. New research shows why. My grandmother’s story is why I think about this differently than most doctors do — and it’s exactly what I’d want to look at with you before symptoms start: your estradiol, your tissue health, your urinary history. Let’s get ahead of this → 🤓 What to know: vaginal estrogen is for symptoms, prevention, and longevity. ❌ The old assumption: Vaginal estrogen is for women with severe dryness or pain with sex. Use it short-term. Stop it when symptoms resolve. ✅ The new reality: Vaginal estrogen has negligible systemic absorption, no demonstrated risk of cancer or blood clots, and prevents the tissue decline that leads to UTIs, incontinence, and — at its worst — sepsis and death. The FDA removed its black box warning in November 2025, effective February 2026 [2] . Sepsis rates: 10.6% in women on vaginal estrogen vs. 19.4% in those who weren’t. Mortality: 0.42% vs. 1.54%. And as few as 4% of postmenopausal women who need it are actually using it. 🦠 Why menopause destroys the urogenital ecosystem Estrogen receptors line the vaginal walls, urethra, and bladder. When estrogen drops, these tissues thin out, and vaginal pH rises. Lactobacillus — the protective bacteria that block pathogens — disappears. Enterobacteriaceae move in. This is genitourinary syndrome of menopause (GSM), and it affects up to 84% of postmenopausal women [3] . Unlike hot flashes, it doesn’t resolve. It progresses quietly, for years. This is how UTIs become deadly in elderly women — not because of the bacteria, but because of what the tissue has become. Persistent UTIs plus a waning immune system leads to pyelonephritis, sepsis, IV antibiotics, hospitalization, and death. 🧬 Vaginal DHEA vs. estradiol Estradiol cream and inserts work by directly restoring estrogen to vaginal tissue. DHEA works similarly but has added benefits: vaginal cells convert it locally into both estrogens and androgens — a process called intracrinology. Blood levels of either hormone don’t meaningfully change [4] . The androgen piece matters for sexual function specifically — nerve density, sensation, libido. Use estradiol for tissue preservation and UTI prevention. DHEA may be especially helpful if sexual function is also part of what you want to address. One note: DHEA has not been studied in breast cancer survivors — if that’s your history, stick with vaginal estradiol. 💪 What to do: don’t wait for symptoms. This is the reframe I want every woman — and our medical system — to make. We treat vaginal hormones like a last resort, something you reach for when it burns, when the UTIs won’t stop, when sex is too painful. That’s backwards. Waiting for tissue to atrophy before treating it is like waiting for a fracture before doing bone density work . The goal is to preserve what’s there. The Vaginal Hormone Protocol: Vaginal estradiol cream 0.01%: 1g twice weekly for life Estradiol vaginal inserts: 1 insert twice weekly for life Vaginal DHEA: nightly × 14 nights, then 2–3 nights/week for life All three restore vaginal tissue, protect against UTIs, and reduce urinary symptoms. DHEA also converts locally to androgens, which makes it particularly useful if sexual function and sensation are a priority. 1️⃣ Start tracking your genitourinary health now. You don’t need symptoms to pay attention. Notice dryness. Notice changes during sex. Notice UTI frequency, incontinence, or urinary urgency. These are early signals — and early is when intervention does the most. 2️⃣ Get your hormones tested twice a year in perimenopause. Estradiol, testosterone, progesterone. Establish a baseline and track how they trend — perimenopause is wildly variable , and some women start fluctuating in their late 30s. 3️⃣ Ask your doctor about vaginal estrogen. If they express concern about cancer or clot risk, share that the FDA removed the black box warning in February 2026 based on evidence of negligible systemic absorption. If they won’t prescribe it, find someone who will. 4️⃣ Start proactively — not reactively. I’m 44. My hormones look good. I have no symptoms. But I plan to start vaginal estrogen in the next 2–3 years anyway — because tissue preserved early is easier to maintain than tissue that has already atrophied. ⭐ If you do one thing: Ask your doctor for vaginal estradiol at your next visit — not because something is wrong, but because something will be if you wait. Bring the Journal of Urology stat if you need to. The goal: Preserving tissue, protecting your urinary tract, and maintaining your vitality for the next 40 years. Does this resonate? Are you — or is your doctor — already having this conversation? Hit reply. 💛 The Momgevity Files This weekend my 6-year-old daughter got a package in the mail from my mom: an intricately carved, child-sized wooden chest of drawers with an attached vanity mirror that originally belonged to my great-great Aunt Martha — and that my grandmother, my mom, and then I all had in our bedrooms as children. It was made in 1885. It doesn’t really go with our decor, and I’m terrified it’s going to get destroyed by her little brother, who is 4 and wields a marker like a weapon. But I love that it’s here. It represents a chain unbroken for over 140 years, and reminds me of how much we’ve changed as a culture — and how much we haven’t. As women, the chest reminds me, self-care can be as simple as organizing our things, brushing our hair, and getting ready for the day in a thoughtful way. These rituals are instilled in us early and stay with us for life. Having the personal space and time to do them is vital to our sense of wellbeing. But the complexity of what it means to practice self-care as adult women today has exponentially spiraled. Supplements, hormones, DIY weight loss drugs, lab tests, workouts, mental health, skincare — the decisions we’re expected to navigate are genuinely overwhelming. As I watched my daughter put on her headband in that little mirror, I felt almost overwhelmed for her. What lies ahead for her? Will it be even more complicated in a world of AI and information overload — or will it somehow get easier? What I know for myself, my friends, and my patients is that it’s become too complex to do alone. Everyone needs a trusted guide — a doctor, or at least a sounding board — to cross-reference questions, triangulate experience, weigh personal values, and make a call. And that’s okay. Longevity, when you think about it, is just a sophisticated form of self-care. And it’s not best pursued as a solo mission. It’s why I do what I do, and why I’m proud that Parsley exists as a guide for so many people navigating these decisions. It’s also why I write. I hope these newsletters demystify some of the small but important choices you’re making every day — as you look in the mirror, or as you watch your children look in theirs. Don’t get overwhelmed. Remember that each choice is just one step forward, one piece of the puzzle. You can’t go wrong. You’re one in a long line of people who were thoughtful about how they took care of themselves — and who did it with love. ⚡ One more thing… If you’ve never had a conversation with your doctor about vaginal estrogen — or if that conversation went nowhere — come to Parsley. We look at your estradiol, testosterone, urinary history, and tissue health together, and build a protocol that gets ahead of decline rather than waiting to treat it. Talk to a Parsley clinician → Stay strong, stay curious, and breathe, Robin Join Parsley using RBMDCREW to save $100 on your membership. Frequently Asked Questions Is vaginal estrogen safe for long-term use? Yes — vaginal estrogen has negligible systemic absorption and no demonstrated risk of cancer or blood clots. The FDA removed its black box warning in November 2025, effective February 2026, based on this evidence. I recommend it for life, starting proactively rather than waiting for symptoms. What is the difference between vaginal DHEA and vaginal estradiol? Both restore vaginal tissue and protect against UTIs, but they work differently. Estradiol directly restores estrogen to the tissue, while DHEA converts locally into both estrogens and androgens — a process called intracrinology — without raising blood levels of either hormone. DHEA may be especially helpful if sexual function and sensation are also priorities, but it has not been studied in breast cancer survivors. How much does vaginal estrogen reduce UTI risk and mortality? According to a 2025 Journal of Urology study, sepsis rates in postmenopausal women were 10.6% in those on vaginal estrogen vs. 19.4% in those who weren’t — and mortality was 0.42% vs. 1.54%, representing a 73% reduction. Despite these numbers, as few as 4% of postmenopausal women who need it are actually using it. When should I start vaginal estrogen? I believe every woman should start by 50 at the latest — and proactively, not reactively. I’m 44 with no symptoms, and I plan to start in the next 2–3 years anyway, because tissue preserved early is easier to maintain than tissue that has already atrophied. The goal is preservation, not rescue. Scientific References Journal of Urology, 2025 — 73% mortality reduction from UTI sepsis with vaginal estrogen AUA, 2025 — FDA removes black box warning from vaginal estrogen products StatPearls, 2024 — Genitourinary syndrome of menopause affects up to 84% of postmenopausal women Journal of Steroid Biochemistry, 2008 — Intracrinology: local DHEA conversion, no systemic hormone change Keep Reading Is estrogen the ultimate longevity drug? Perimenopause Symptoms: What the Research Shows My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## GLP-1s and Libido: What the Research Shows
URL: https://www.robinberzinmd.com/glp-1-libido-motivation-brain/
Updated: 2026-05-03 · Topics: Women’s Health & Hormones
Summary: GLP-1s silence food noise — but they reach the same brain circuits that govern sex, motivation, and desire. Here’s what the research actually shows.
GLP-1s have been on the market for years now, with as many as 1 in 8 adult Americans using them at some point. And what’s clear, and fascinating, is that the side effects I’m hearing about are evolving. Robin’s Short Version 18% of GLP-1 users reported increased sexual desire and 16% reported decreased desire — effects running almost equally in both directions. GLP-1 receptors are expressed throughout the brain’s reward circuitry — including the nucleus accumbens and ventral tegmental area (VTA), the same structures that govern sexual desire, motivation, and the will to pursue anything. Exercise — especially vigorous exercise — is one of the most powerful dopamine-boosting tools we have. Not nausea. Not even the muscle loss issue. It’s quieter than that. A patient of mine who used to be driven, ambitious, deeply present in her marriage… says she feels fine. But… a little flat, as if she is disconnected or "offline." Another patient who had suffered for years from binge eating disorder. Constant food obsession. Food taking up enormous real estate in his head. Since starting Semaglutide, that mental noise is gone. He’s more present with his kids. More focused at work. He says it gave him his life back. Both of these experiences are real. Both are happening with the same drug class. This week, I unpack what’s going on in the brain on these drugs, whether or not this hyped phenomenon of motivation loss is real — and what we still don’t know. If you’re on a GLP-1 and noticing mood, motivation, or desire shifts — or wondering whether to start one — this is exactly what I’d want to look at with you: your testosterone, estrogen, thyroid, and full metabolic picture alongside the drug. Let’s look at the whole story → 🤓 What to know: Your hunger and your libido share the same wiring. ❌ The old assumption: GLP-1 drugs work in the gut and pancreas. Their effects on appetite are peripheral. The brain is mostly incidental. ✅ The new reality: GLP-1 receptors are expressed throughout the brain’s reward circuitry — including the nucleus accumbens and ventral tegmental area (VTA), the same structures that govern sexual desire, motivation, and the will to pursue anything. Food, sex, achievement, connection — these are not separate drives. They run on the same dopamine infrastructure. 🧠 Hunger and desire are primordially linked. The mesolimbic dopamine system — your brain’s core "wanting" circuit — evolved to drive pursuit of survival rewards: food, mates, connection, status. Hunger and sexual desire both rely on the same dopaminergic "wanting" signal. When you modulate one, you touch all of them. 🔬 What the research actually says — which is: not much, yet. The only randomized controlled trial on GLP-1s and sexual desire used 24 lean healthy men on dulaglutide for four weeks. That’s it. It found no effect on libido. But that study tells us almost nothing about overweight women on semaglutide for a year — which is who is mostly taking these drugs [1] . A Kinsey Institute survey of 2,000 adults found that among GLP-1 users, 18% reported increased sexual desire and 16% reported decreased desire — effects running almost equally in both directions [2] . The FDA adverse event database has flagged 182 cases of GLP-1-associated sexual dysfunction since 2003 — a weak signal [3] . 18% of GLP-1 users reported increased sexual desire. 16% reported decreased desire. The effects run almost equally in both directions — which tells you this is not a simple story. 📉 The serotonin mechanism — real, but complicated. GLP-1s activate the 5-HT2C serotonin receptor. This is the same pathway through which SSRIs reduce libido. Theoretically, this could suppress sexual desire. But weight loss itself raises testosterone, improves vascular function, and boosts mood — all of which push libido up. The two forces may cancel out for many people, and tip one way or the other depending on the individual [4] . 🤷 The honest bottom line: We don’t know. There isn’t enough research on women. Long-term data doesn’t exist. What we do know is that these drugs reach reward circuits we haven’t fully mapped — and the individual variation in response is enormous. 💪 What to do: Track your desire like a biomarker. 1️⃣ Establish a baseline before you start. Before your first dose, answer these honestly: Where is my libido right now? Where is my drive and motivation? How much joy and enthusiasm do I feel about my work, relationships, and daily life? Write it down. These are your benchmark numbers. 2️⃣ Do a weekly check-in — seriously, write it down. I can’t remember what I had for lunch last Tuesday, let alone what my motivation for work was a month ago. Writing it down is key. So once a week, take 5 minutes and journal: What has changed since I started the GLP-1? Is my motivation higher or lower? My sexual desire? My emotional availability? My drive to pursue things I care about? Patterns only emerge over time. 3️⃣ Don’t assume your experience will match someone else’s. Different GLP-1s hit brain receptors differently. What flattens one person’s desire may free up another’s. Semaglutide ≠ tirzepatide ≠ liraglutide. If you’re experiencing unwanted blunting on one, a different formulation — or a different dose — may not have the same effect. 4️⃣ Assess for other brakes on the gas. If you’re feeling flat on a GLP-1, it’s worth asking: was I already flat before? Are there other factors sitting on the brake of my desire and motivation — undiagnosed or undertreated ADHD , anxiety, complex feelings in a relationship, burnout, low testosterone or estrogen, thyroid issues? The GLP-1 may not be the only story. 5️⃣ Protect your dopamine system with vigorous exercise. Exercise — especially vigorous exercise — is one of the most powerful dopamine-boosting tools we have. So is consistent, high-quality sleep. Both support the reward circuitry that GLP-1s may be modulating. Both are evidence-backed. If you’re on a GLP-1, these aren’t optional extras. They’re protective. 6️⃣ If something feels off, say something. The field is moving fast. Clinicians need to know when patients experience changes in mood, libido, or motivation on these drugs. This data drives future research. Don’t minimize it. Report it. ⭐ If you do one thing: Establish your baseline before your first dose — libido, motivation, enthusiasm, drive, all of it. Write it down. You can’t track what you didn’t measure. The goal: You don’t have to choose between metabolic health and a full, desire-driven life. But you do have to pay attention. 💛 The Momgevity Files When did all the moms get hot? This was posed by a male Instagram creator whose videos on his experience with his wife in perimenopause are deadpan and very funny. This one made me laugh — and it reminded me of a comment a male friend made recently about a woman we know being "super hot for a mom." I told him: you probably need to reframe what a mom is and what she looks like. Another joke I’m hearing a lot lately is that my beloved millennial generation is hitting perimenopause and we are not going down without a fight — holding on to our 2000s tube-top party days come hell or high water. Truth! In my case, my abs at 44 are way worthier of a tube top than my abs at 24. Just saying. 😉 I also hear from countless women in their late 30s and 40s that their sex drive is way up after kids — not down — and they’re surprised, as if they assumed that once their fertile years were behind them, desire would just wither away. We’ve absorbed a lot of silly programming. It feels like time to undo it. What I see in practice — with patients, with friends, and in my own life — is that the perimenopause and midlife experience today looks nothing like our mental model. Women are looking and feeling amazing. Fit, energized, in their prime. Their drive isn’t slowing down — in career or in bed. If anything, they’re liberated from the assumptions, judgments, and fears that held their younger selves back. More fully expressed than ever, they’re free to embody their truest desires. The fact is, what good is longevity if you don’t know what you want? Or you’re too afraid to have it? The best part of getting older, I’m finding, is clarity — on what I want, comfort in my own body and skin, and a refusal to uphold anything that isn’t true to me, regardless of consequence. I think women at this age and phase of life were always hot. But this generation of millennials — myself included — are embracing and embodying it more than ever, reshaping what it means to be a woman, and a mom, in the process. Does this resonate? Have you noticed changes in drive or desire on a GLP-1 — or know someone who has? Hit reply. Stay strong, stay curious, and breathe, Robin Frequently Asked Questions Do GLP-1s like Ozempic decrease libido? The evidence is genuinely mixed. A Kinsey Institute survey of 2,000 adults found 18% of GLP-1 users reported increased sexual desire and 16% reported decreased desire — effects running almost equally in both directions. The FDA adverse event database has flagged 182 cases of GLP-1-associated sexual dysfunction since 2003, which is a weak signal, not a clear causal link. How do GLP-1s affect motivation and reward in the brain? GLP-1 receptors are expressed throughout the brain’s reward circuitry — including the nucleus accumbens and ventral tegmental area (VTA), the same structures that govern sexual desire, motivation, and the will to pursue anything. Food, sex, achievement, and connection all run on the same dopamine infrastructure, so when you modulate one drive, you touch all of them. How do I track libido and motivation changes on a GLP-1? I recommend establishing a written baseline before your first dose — rate your libido, drive, motivation, and enthusiasm on a 1–10 scale. Then do a weekly journal check-in for at least 3 months. You can’t track what you didn’t measure, and patterns only emerge over time. Is semaglutide different from tirzepatide for libido effects? Different GLP-1s hit brain receptors differently, and what flattens one person’s desire may free up another’s — semaglutide ≠ tirzepatide ≠ liraglutide. If you’re experiencing unwanted blunting on one formulation, a different drug or dose may not have the same effect. This is exactly the kind of individual variation worth discussing with your clinician. Scientific References EBioMedicine, 2024 — GLP-1 receptors in brain reward circuits and desire Kinsey Institute, 2025 — Survey of 2,000 adults on GLP-1 sexual desire effects International Journal of Impotence Research, 2025 — FDA adverse events GLP-1 sexual dysfunction Journal of Sexual Medicine, 2025 — Serotonin 5-HT2C pathway and libido on GLP-1s Keep Reading Why GLP-1s Underperform Without Estrogen Testosterone Therapy Is Trending—But Is It Right For You? My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The best “calm tech” to hack your vagus nerve
URL: https://www.robinberzinmd.com/hacking-the-vagus-nerve/
Updated: 2026-05-03 · Topics: Brain, Mood & Nervous System
Summary: I’m fascinated with tech that promotes high “vagal tone,” i.e. stimulates the vagus nerve to help improve stress response.
I’m obsessed with technology that helps us feel better by hacking the amazing machine we are as humans. Lately I’ve been really fascinated with tech that promotes high “vagal tone,” i.e. stimulates the vagus nerve to help lower heart rate, reduce blood pressure, and improve stress response. Robin’s Short Version Vagus Nerve Reach: The vagus nerve carries 75% of the body’s parasympathetic fibers, linking your brain, heart, and gut. Low Vagal Tone Costs: Poor vagal tone can trigger bloating, heightened stress sensitivity, and chronic inflammation in the body. Scent Activates Calm: Lavender and frankincense stimulate the vagus nerve via the olfactory system’s direct influence on the limbic system. I went all in on this “calm tech” while speaking at the Eudemonia Summit this fall where I got to have a test session in the Ammortal chamber—the $150,000 full-body therapy on GOOP’s gift list that combines red light with PEMF (pulsed electromagnetic field), vibroacoustic sound, and hydrogen inhalation therapy. I literally felt like I had a new brain after 30 minutes, the relaxation response was that profound. Admittedly, most of us can’t live in an Ammortal chamber. (If you get one, let’s talk!) But there are a few other calm tech options I’ve tried recently that are more accessible. Since this is probably the most stressful week of the year, I thought I’d share. The research says What is the vagus nerve? The vagus nerve, also known as Cranial Nerve 10, is the longest nerve in the body. You actually have two of them, right and left. Together, they contain 75% of the body’s parasympathetic nerve fibers, which send information between the brain, the heart, and the gut. It’s referred to as “The Wanderer” in Ayurveda since it touches so many of the body’s key systems. As part of the autonomic nervous system (ANS), the vagus nerve isn’t something you consciously control, though your actions and environment do have a major influence on how it functions. Stimulating the vagus nerve—i.e. promoting high vagal tone—is key for supporting your body’s parasympathetic “rest, relax, digest and heal” response. A state of low vagal tone can cause digestive symptoms like gas and bloating, increased sensitivity to stress , and inflammation . (Research suggests the vagus nerve may also be a modifier of obesity .) Vibroacoustic therapy and the vagus nerve Emerging research shows vibroacoustic therapy (sometimes called tapping or VAT) may contribute to stress management through its effects on heart rate variability. The theory is simple: specific vibration frequencies can stimulate vagal tone and increase heart rate variability, which sharpens cognitive performance, improves sleep and lowers stress. Aromatherapy and the vagus nerve Aromatherapy is admittedly not really “tech” but I love a high-tech, low-fi mix and there’s a fascinating body of research exploring the impact on aromatherapy on everything from heart rate to brain wave composition. The practice can stimulate the vagus nerve through the olfactory system and its direct influence on the brain, particularly the limbic system (including the hypothalamus and amygdala), which plays a role in emotions, stress regulation, and autonomic functions. When the brain processes certain soothing or calming scents (such as lavender, chamomile, or frankincense), it can activate the parasympathetic response, which in turn stimulates the vagus nerve. What I’m doing for my own body “Calm tech” using these modalities seems like it’s popping up everywhere lately in the form of wearables and in-home devices. In addition to the Ammortal Chamber, I recently tried the Shiftwave chair in my office. It uses pulsed pressure wave therapy to stimulate the vagus nerve to reduce stress and improve sleep. I’ve also added two other pieces of “calm tech” to my daily routine to help support vagal tone. The first is Osea’s Vagus Nerve Trio . I’ve been a big fan of Osea’s non-toxic formulas for years so I was super excited when they came out with this set to promote vagal tone. The pillow mist smells beautiful! Secondly, I’ve been using The Apollo since this fall and am really impressed. It’s a brilliantly simple solution: a watch-sized wristband applies specific vibrational patterns to the skin designed to engage the body’s mechanoreceptors, which send signals to the brain and activate the autonomic nervous system. When calibrated to trigger a calming response, these vibrations stimulate the vagus nerve for increased heart rate variability, lowered blood pressure, and increased feelings of calm. Since I’ve been wearing it, the Apollo has reduced my personal stress response by 20%. These are just the products I’ve personally tried recently—if you have experience with others, send them to me! What I recommend for you There are plenty of DIY ways to stimulate your vagus nerve (meditation, HIIT and yoga all have research behind them) which I talked about in a past newsletter . If you’re chronically stressed, I highly recommend trying the Apollo. I think of it like a supplement to support my existing meditation routine. Get $60 off with my personal link and code RBMD. A final note on stress: We live in a world designed to destroy our calm. So, how can we address stress for the longterm? I’ll be going deeper on the impacts of chronic stress for longevity at Luminescence , a one-day summit in LA in February. Get your ticket here and use code ROBIN20 for a 20% discount. Keep Reading The breathing habit that will transform your health overnight. How to reduce stress in 15-minutes Plant medicine can be a tool, but it’s not a cure. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Why so many women are using creatine (including me)
URL: https://www.robinberzinmd.com/why-so-many-women-are-using-creatine-including-me/
Updated: 2026-05-03 · Topics: Women’s Health & Hormones
Summary: Women naturally store 20–30% less creatine than men. At 44, I’m calling this my Year of the Booty—aka time to prioritize building lean muscle mass. Creati
Women naturally store 20–30% less creatine than men. At 44, I’m calling this my Year of the Booty —aka time to prioritize building lean muscle mass. Creatine is on my shortlist of tools to help. Robin’s Short Version The Storage Gap: Women naturally store 20–30% less creatine than men, making a daily 3–5g dose especially impactful. Brain Boost Is Real: A meta-analysis of 16 studies found creatine improves memory, attention, and processing speed—with stronger effects in women. Skip the Loading Phase: A consistent daily maintenance dose delivers the same muscle-saturating results as loading, with far less bloating. Turns out, the old-school gym bros were onto something—just not the whole story. Creatine does a lot more than fuel your workout while you pump up your biceps. 🤓 What to Know: Creatine supports your muscles, bones and brain. After decades of yoga, I finally dropped my fear that lifting weights would make me “bulky.” Muscle isn’t about vanity—it’s about vitality. I’m post-babies, pre-perimenopause—prime time to build lean mass before hormonal shifts make it harder ( Experimental Gerontology 2021). So, I picked up weights, added a weekly HIIT class, and started researching supplements to help make my workouts more effective. I thought creatine was only for 80s bodybuilders. But it’s become a staple in the longevity world—particularly among women—for good reason: Muscle & Metabolic Health: Creatine itself doesn’t build new muscle but improves your body’s ability to perform—and recover from—strength-based exercise. Creatine helps rapidly regenerate ATP, the primary fuel for short, intense exercise like lifting or sprinting ( Nutrients 2021). This means you can lift heavier, do more reps, and recover faster between sets—leading to more muscle-building stimulus over time. Bone Health: Creatine supplementation is not a stand-alone “bone booster.” But again, it can support the bone building benefits of exercise. Paired with consistent resistance training, research shows it can preserve bone strength and structure as you age ( Bone 2022). It might be especially beneficial for at-risk women during and after menopause ( Medicine and Science in Sports and Exercise 2015) though more research is needed here. Brain Health: A meta-analysis of 16 studies showed creatine can boost memory, attention, and processing speed—especially for women ( Frontiers in Nutrition 2024). One small study even found improvements for Alzheimer’s patients ( Alzheimer’s & Dementia 2025). A single high-dose (~25 g) of creatine can reverse fatigue-related cognitive decline when you’re sleep-deprived ( Nature 2024), which makes sense given how many reports I’m hearing that creatine is helping people find jetlag relief this summer. And yes, it’s safe. A review of nearly 700 studies found no significant side effects compared to placebo ( Journal of the International Society of Sports Nutrition 2025). Some people get mild GI upset or cramps, but it’s rare. 💪 What to Do: Take 3-5g creatine daily. How much: 3–5g daily of creatine monohydrate or creatine HCL. I take 5g of creatine monohydrate. I don’t experience any bloating or GI side effects but if you do, try dropping down to 3g or switching to HCL. When: Anytime works—consistency matters most ( Frontiers 2022). I add mine to my morning smoothie. Avoid: ❌ Creatine Ethyl Ester (CEE)—less effective and breaks down faster. ❌ Premixed liquids—unstable in liquid form and quickly breaks down into ineffective creatinine. Plus, liquids often contains additives or fillers. ⚪ Lipsomal creatine—a newer form of creatine encapsulated in fat-based liposomes to enhance absorption and reduce breakdown. It’s more expensive and lacks the decades of research supporting creatine monohydrate. Do I need to “load” it? Optional. You can do 20g/day (split into 4 doses) for 5–7 days to saturate muscles faster, then switch to a 3–5g daily maintenance dose. But you’ll still see benefits without it—and bloating is more likely with loading. ⚡ Lightning Round My Favorite Creatine I like Thorne’s creatine monohydrate , but I’ve also been using my friend JJ Virgin’s SHEatine supplement which is creatine HCL, a more water-soluble form of creatine that’s less likely to cause GI issues. Both work for me and I don’t have any negative symptoms with either. See what works best for your body. 🛒 Try the capsule form if you want to avoid the giant tub on your counter Lower your risk of ovarian cancer by 50% Tubal ligation (“getting your tubes tied”) is still the most common permanent birth control for women ( CDC 2020). Data shows removing the fallopian tubes (salpingectomy) instead of tying them can cut your ovarian cancer risk in half ( Obstetrics & Gynecology 2022). 🔎 I’m sharing this article with every patient done having kids—please share it with a friend who should know, too! Listen In: My Brains, Bones & Booty Protocol I joined Dr. Stephen Gundry’s podcast to break down my full BBB protocol. i.e. how we protect cognitive health, bone density, and muscle strength through midlife and beyond. We also tackled why HRT is still wildly under-prescribed and how to know if your wearable is giving you accurate sleep data. 🎧 Listen for more on the protocols we prescribe for HRT and our take on which wearable is actually right. 💛 The Momgevity Files I’m writing you a prescription for a detox— from life . This week, every mom friend and patient I know is saying the same thing: I’m done. Yoga, ashwagandha, breathing apps? Cute, but not cutting it. They want something stronger—like a Valium. I feel it too. The collective anxiety is brutal. The news out of Texas? It’s absolutely gutting as a parent to watch. Add the endless doom-scroll, end-of-school chaos, work, family— too many threads to hold . When I’m this spun up, my nervous system waves the white flag. So here’s my radical move: I’m taking my two-week summer break and actually stopping . No “one more call.” No micromanaging camp schedules that are already managed by someone else. No headline rabbit holes. Think of it as a life detox. Like hot sauna/cold plunge resets your body, unplugging resets your brain. We need valleys, not just peaks. Stay stuck on “go” too long and your stress system fries. So here’s your nudge: If you’re craving a Valium, maybe you really need a world-off switch. Drop the threads. Find your quiet valley. And if you must do something ? Here’s how you can help the families of the victims of the Texas floods this week. World Central Kitchen Texas Search and Rescue Donate directly to families Stay strong, stay curious—and don’t forget to breathe . Robin Keep Reading Forget Weight—Muscle Mass Is the Real Longevity Metric. Your bone density blueprint. My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Metabolic flexibility: The secret engine behind energy, fat loss, and longevity.
URL: https://www.robinberzinmd.com/metabolic-flexibility-the-secret-engine-of-longeivity/
Updated: 2026-05-03 · Topics: Longevity & Metabolic Health
Summary: Metabolic flexibility is your body’s ability to switch between burning carbs and fat for fuel. It’s also the true engine of longevity.
Plus, why your melatonin is backfiring. Robin’s Short Version Muscle is medicine: Skeletal muscle absorbs ~80% of post-meal glucose, making strength training 2–3x per week a direct fix for insulin resistance. Sleep wrecks insulin: Under 5 hours of sleep cuts insulin sensitivity by 24%, putting poor sleep on equal metabolic footing with a bad diet. Fat-burning is trainable: Zone 2 cardio at conversational pace for 150–300 minutes per week rebuilds mitochondrial density and restores your ability to burn fat. You don’t need a faster metabolism. You need a more flexible one. Many of my patients in their 40s and 50s tell me the same thing: they’re gaining weight, workouts feel harder, and they’re just…tired. They assume their metabolism is slowing down. But what’s really happening is a loss of metabolic flexibility : your body’s ability to switch between burning carbs and fat for fuel. 🚦Here’s how it should work: At rest, sleeping, or light movement: You burn fat (a slow, steady fuel source). During moderate activity: You burn fat + carbs for a balanced energy mix. In intense exercise: You burn mostly carbs for quick power. When you’re metabolically inflexible—often from insulin resistance or overfeeding—your body gets “stuck” in carb-burning mode. You lose the ability to tap into stored fat. Here’s how to know if you’re stuck and how to get more flexible. 🤓 What to know: Metabolic flexibility is the engine of longevity. Metabolic inflexibility drives nearly every chronic condition we see today: 🧠 Alzheimer’s 🫀 Heart disease 🍩 Type 2 diabetes 🍷 Fatty liver 🌀 PCOS + hormone dysfunction 🎯 Cancer Over 1 in 3 Americans already have prediabetes—many without knowing it. (This is one of the many reasons I recommend functional labs 2x per year starting at age 25!) 🛑 Signs your metabolism is stuck If these feel familiar, your body may be struggling to switch fuels (even if your labs look “normal”): You crash after meals or need caffeine/sugar to get through the afternoon You feel dizzy or irritable if you skip a meal You gain weight easily—despite eating “clean” You’re always hungry (especially for carbs) Your endurance is tanking Skin flare-ups (acne, rosacea, eczema) won’t quit 📈How to measure metabolic flexibility 🧪The gold standard is Indirect Calorimetry , which measures oxygen and CO2 exchange to show your current fuel mix. A flexible metabolism has: Low RER at rest (burning fat) High RER during effort (burning carbs) You can get this done at sports performance labs. Some wearables like Lumen offer consumer versions. 🧬 Easier-to-track clues: Fasting insulin + glucose → Elevated levels suggest insulin resistance CGM or post-meal glucose → >140 mg/dL after eating = early dysfunction Triglycerides >100 or low HDL (<50 mg/dL for women, <40 mg/dL for men) → Poor fat metabolism Waist circumference >35 (for women or >40 for men) → Strong predictor of metabolic disease Low VO2 max → Sign of poor mitochondrial function poor fat oxidation 💪What to do: Muscle building, restorative sleep, magnesium supplements and hormone-therapy reverse metabolic rigidity. The beauty of metabolic flexibility? It’s trainable. With the right mix of movement, food, and recovery, you can rewire it in months. 🏋️ 1. Build muscle Muscle is your largest glucose sink; it soaks up ~80% of post-meal glucose ( Comprehensive Physiology , 2021). Strength train 2–3x/week → Even a single weight training session improves insulin sensitivity for 24–48 hours ( Diabetes Care , 2013). Eat 1.2–1.6 g protein/kg/day spread across meals ( Journal of Cachexia, Sarcopenia and Muscle , 2022). 🔥2. Train your fat-burning engine Do Zone 2 cardio (150–300 min/week) Go at a pace where you can still hold a conversation Builds mitochondrial density + fat oxidation ( Translational Sports Medicine, 2025 ) ⏰3. Time your meals Try early time-restricted eating → 8–10 hour window ending by late afternoon ( Cell Metabolism , 2018) Avoid grazing Limit refined carbs Aim for 30g+ fiber/day 😴4. Prioritize sleep Getting <5 hours of sleep can reduce insulin sensitivity by 24% ( Sleep Medicine Reviews , 2019). Aim for 7–9 hours/night. 💊5. Smart supplementation Magnesium : Improves fasting glucose + insulin resistance ( Pharmacological Research , 2016) Omega-3s : Supports mitochondrial function + lowers inflammation ( Nutrients , 2018) Berberine : Lowers glucose + insulin resistance ( Biology , 2023) 🌸6. Consider HRT (if applicable) Estrogen makes your mitochondria more efficient, spares glycogen, and improves fatty acid transport ( Acta Psychologica , 2024). If you’re in perimenopause or menopause, work with an HRT-trained provider to assess if hormone therapy could support your metabolic health. ⚡Quick Hits 🌙 Melatonin misuse = wired + tired. If melatonin has ever left you wired, groggy, or awake at 3 a.m., here’s why: most people take too much, too late, or use the wrong type. Melatonin is a signal , not a sedative. Try 1–3mg time-release melatonin 1–2 hours before bed. ⏱ “Exercise snacks” boost VO2 max fast. Per a new study : short bursts of movement (≤5 minutes, done a few times per day) significantly improve cardiovascular fitness in inactive adults—in just 4 weeks. My 3 go-to moves when I’m short on time. 🎧 On the mic I joined WHOOP’s first-ever Medical Advisory Board! Listen to my latest podcast with them on advanced lab testing and performance health. 💛 The Momgevity Files This week, I finally got to share something I’ve been quietly working on for months: I joined WHOOP—a top wearables company with millions of users—as a member of their new medical advisory board, alongside some truly incredible doctors. Ten years ago, when wearables first came out, I honestly thought they were overly simplistic at best (yay, steps!) and borderline creepy at worst. Do you really need to track yourself 24/7? Isn’t it just going to confirm what you already know? Lately, now that I’m a full-time WHOOP user, I’ve become a convert. It’s partly because the tech has evolved. We are way beyond steps. Now, I get real-time data on stress, sleep, heart-rate variability, VO₂ max, heart rate zones, and even healthspan. But the real reason I’m sold? The wake-up call. Since having kids, exercise has been my Achilles’ heel. I eat an anti-inflammatory, high-fiber, low-refined-carb, near-zero UPF diet. I meditate daily. My supplement stack is dialed. But exercise? Honestly, my “good weeks” used to mean one yoga class…maybe . Seeing that my heart rate barely gets out of zone one ( ha! ) has been eye-opening and, more importantly, motivating. I’m actually lifting weights now (mostly in my basement, but every other week with a trainer—pricey, but they push me farther than I’d go solo). I’m carving out time for Japanese interval walks. I’m doing YouTube HIIT sessions in the evenings. And I love seeing that I actually hit zone 2—sometimes even zone 3! Like all of us, I’m wired to want the gold star. Longevity, at its core, is about time and I used to say I didn’t have it. But time is plastic—it stretches and contracts around what we prioritize. The other day, a friend said it finally hit her: she has to find those 20 minutes for weights despite the two kids, the demanding family, and the big job, because if she wants to be dancing at her daughter’s wedding, longevity isn’t something she can just get to later. Later is now. In my case, I’m deeply proud that I—a mom of three, a non-athlete, a nerd, in fact!—am now a face of longevity for a performance health company like WHOOP. We longevity moms may not have started the movement, but the biohacker bros have nothing on us. We’re more motivated than anyone. We have lifetimes to live, in the blink of an eye. Stay strong, stay curious, and breathe, Robin Keep Reading 4 fasting for women strategies to optimize longevity. What a CGM Can Tell You About Your Aging Velocity If You Only Fix One Thing for Longevity, Make It Your Mitochondria. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## All your questions answered about Ozempic and GLP-1s
URL: https://www.robinberzinmd.com/all-your-questions-answered-about-ozempic-and-glp-1s/
Updated: 2026-05-03 · Topics: Longevity & Metabolic Health
Summary: Should I take Ozempic? Does the weight come back? What exactly are GLP-1s?GLP-1s, or Glucagon-Like Peptides, are hormones produced by the intestines that r
Hi everyone – Robin’s Short Version Weight Always Returns: Dr. Berzin has not seen a single patient stop GLP-1 therapy without regaining the lost weight. Muscle Loss Overlooked: Rapid weight loss on GLP-1s includes lean muscle mass, not just fat — a critical trade-off beyond the metabolic gains. Supervision Still Required: Even without insurance coverage, medical oversight is essential given rare but serious risks like gastroparesis and intestinal blockage. Should I take Ozempic? Does the weight come back? What exactly are GLP-1s? I’m getting these questions a lot these days, from patients, from friends, and in DM’s from followers, so I decided to put my answers in one place and share them here. Also hi again – it’s been a minute since I last emailed. If you know anyone else that may want occasional updates about health topics of the day, have them sign up here . Ozempic, Mounjaro and other GLP-1’s are in such high demand that pharmacies like Capsule can’t fill them. Direct-to-consumer sites like Calibrate, Found and Weight Watchers (which are all led by amazing female CEOs, btw) are effectively selling them for cash and health insurance company execs are wringing their hands at how much they’re spending to cover them. Word is the Blue Cross/Blue Shield network alone spent $1.8B in 2022, when these drugs were even less popular than they are today. But wait, what exactly are GLP-1s? GLP-1s, or Glucagon-Like Peptides, are hormones produced by the intestines that regulate appetite, food intake, intestinal mobility, and blood sugar levels. Medications based on GLP-1 are synthetic versions of these hormones, designed to elicit a stronger response. Originally developed to treat diabetes, their effect on weight loss was initially seen as a secondary benefit. However, with the introduction of newer drug versions and years of off-label use, these medications have surged in popularity. This rise is also supported by emerging research highlighting their diverse benefits. We recently trained our entire clinical team on an updated GLP-1 protocol at Parsley, and I personally prescribed them twice in the past month — to a man dealing with obesity, a binge eating disorder, sleep apnea and who despite not being diabetic, qualifies for having a BMI > 30; and to an overweight but not quite obese woman who had been buying the drugs off the internet and taking them without medical supervision. Because she isn’t diabetic and her BMI isn’t quite high enough, she won’t qualify for insurance coverage, but our team would rather she have medical guidance and nutrition support while she’s on GLP-1s, given the risk of side effects. But the biggest question posed to me isn’t how to get them covered or where to get them in stock. It’s do they actually work ? In my experience, the answer is: temporarily. GLP-1s have huge promise and I’m excited for their evolution but the jury is out on whether they are a sustainable solution. They are highly effective for some people and the rapid weight loss that results includes both fat and muscle mass. Per the research, people lose on average 15-18% of their body weight over 68 weeks on the medication. Because of the weight loss, patients benefit from lower blood sugar, improved blood sugar levels for diabetics and reduced instances of metabolic syndrome, resulting from lower food intake. Additional benefits include lower cholesterol and improved upregulation of certain pancreatic hormones and liver function. The side effects, like gastroparesis (stomach paralysis) and intestinal blockage, are serious but rare and can sometimes be avoided by increasing the dose in slower intervals and regular monitoring. As a physician, my concern is that the increased risk of metastatic melanoma may just be the tip of the iceberg on other unintended health consequences. However, these drugs are marketed to individuals, as well as employers and health plans covering the expenses, as a ‘short-term kickstart.’ The aim is to assist people in gaining control over their weight while they adopt healthy dietary and exercise habits. These habits are intended to sustain weight loss and promote increased lean muscle mass and bone density. Regarding this issue, I have not yet observed anyone who discontinued GLP-1 therapy without regaining weight, at least not so far. Some argue that we are still in the early stages of understanding these effects. Others contend that lifelong use of GLP-1s might be the only method for achieving sustainable weight loss. However, this could come at a significant cost, both financially and in terms of potential side effects. These side effects, which may include impacts on thyroid function or increased cancer risk, are not yet fully understood. In my experience, when you essentially overnight mass prescribe a drug class that had been around but previously relegated to a narrow segment of the population, the medical community has come to anticipate that it’ll be 24-48 months until more of the wider risks and side effects become apparent (example: Ritalin ). So then why is Parsley prescribing them? The reason is twofold: not only are GLP-1s a well-established class of diabetes medication that we were already prescribing, but Parsley Health is also dedicated to ensuring our providers are thoroughly trained and stay updated on the latest medications. This includes a comprehensive understanding of their risks, benefits, and side effects. We ensure these medications are prescribed appropriately and monitored safely, rather than risking our members self-managing the drug through consumer sites. Our organization-wide protocol encompasses optimal nutrition and exercise recommendations to prevent weight regain and muscle mass reduction. We also focus on specific blood tests to monitor liver and pancreatic health while a patient is on these medications and provide guidance on safe titration. These are just a few examples. When our patients express interest or have questions, we strive to be a trusted source of perspective. This includes advising some patients against using the drug if it’s not appropriate or covered, based on their failure to meet certain criteria. For the record, we are neither anti- nor pro-GLP-1; we adopt a personalized approach to clinical guidance for each patient. Along with the medical community, we remain cautiously optimistic that some patients will see long-term benefits from these medications. The popularity of GLP-1s mask an underlying problem In my opinion, the core issue is that Americans predominantly consume a diet of which 94% is refined or ultra refined sugars, flours, simple starches, and chemical additives like MSG. These components are designed to override our brain’s satiation signals, leading us to consume far more calories than needed. This situation is outwardly denied by the food industry, yet they continue to fund it. Certainly, obesity is a disease, not merely a ‘failure of willpower.’ However, when two-thirds of the U.S. population, including children, are overweight or obese and these numbers are soaring, it’s clear that environmental factors like diet and sedentary lifestyles are significant contributors to this modern illness. I also believe our focus on weight, specifically the number on the scale, is misguided. True measures of metabolic health include balanced blood sugar levels (Hemoglobin A1C of 5.5 or less, fasting insulin below 10, and fasting blood sugar around 80), and a waist-to-hip ratio of less than 0.80 for women and 0.85 for men. This is because excessive abdominal fat is a key indicator of inflammation and mortality risk. If your scale weight is high, but you maintain an active lifestyle with a diet rich in whole foods, have strong lean muscle mass, a healthy waist-to-hip ratio, good blood sugar control, normal blood pressure, and high energy levels, then you’re on the right track. The scale’s reading becomes less significant. For those on a GLP-1 regimen, maintaining lean muscle mass is achievable through weight training at least three times a week and consuming approximately 1 gram of protein per pound of body weight daily. More details on protein intake for muscle mass will be provided in a future post. If you’re using GLP-1 and aiming to discontinue it while keeping the weight off, retraining your palate to favor a whole-food, plant-dense diet that excludes packaged, processed, refined foods, added sugars, and alcohol, combined with exercises that enhance lean muscle mass, is your best approach. *** Product Recco: Kosterina Olive Oil , founded by a Parsley member and one of our Parsley perks (i.e. you get a discount if you’re a patient). It’s pure EVOO (unlike most olive oils in the US that are cut with other oils even if they say olive oil on the packaging) and filled with amazing antioxidants, and monounsaturated fats that are heart-brain-gut healthy. You can basically drink it! And they have lovely gift sets for holiday . Parsley News: New York and California folks! We are in-network with all major health plans in the greater New York Area, and with Blue Shield California and Aetna California. This means your program fee is just $70 a month and that we bill your health plan for your doctor’s visits. Deductibles and copays apply. Get top notch care with doctors trained in root cause medicine, health coaching, and unlimited messaging with your care team between visits – so that you can get better and feel better. Keep Reading Should we all be microdosing GLP-1? 4 fasting for women strategies to optimize longevity. Metabolic flexibility: The secret engine behind energy, fat loss, and longevity. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Are plant-based meats just ultraprocessed food in disguise?
URL: https://www.robinberzinmd.com/plant-based-meat/
Updated: 2026-05-03 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I get a lot of questions about plant-based meats. Are they good for you or are they just a toxic stew of fillers?
Beware the health halo. Often, friends and patients are shocked when they find out a food billed as healthy contains sneaky harmful additives, or isn’t actually all that nutritive. In this vein, I get a lot of questions about plant-based meats. Are they good for you or are they just a toxic stew of fillers? Robin’s Short Version Emulsifier Risk: Carrageenan is linked to a 46% higher prostate cancer risk and up to 32% higher breast cancer risk. Seed Oil Imbalance: Most Americans consume a 20:1 omega-6 to omega-3 ratio; plant-based meats worsen this, far above the healthy 3:1 target. Protein Absorption Gap: Plant proteins deliver 10–20% less absorbable protein than animal sources, making them less efficient for muscle building. The plant-based meat market is major—it’s projected to reach nearly $25 billion by 2030—fueled by growing concern about the environmental and health impact of red meat. Any form of industrial agriculture has a footprint but the beef industry is definitely bigger and worse. Even though plant-based “meats” are somewhat better for the environment, from a human health standpoint, I’ll take a pasture-raised, grass-fed organic burger over one of these chemical stews any day. Here’s why: The research says Mimicking the taste, texture and protein content of real meat takes serious food science: First, a plant-based protein alternative like soy, pea protein, potato protein, wheat gluten, rice, or mung bean, forms the base. Coconut oil or inflammatory seed oils like canola, sunflower, or safflower are added to mimic the juiciness that comes from fat. Then come the binders, texturizers, and emulsifiers like methylcellulose and carrageenan, which can cause gut disruption and symptoms like bloating. The finishing touches include color and flavor enhancers such as yeast extract, beet juice, soy sauce, heme, and red dye . First the good. Plant-based meats can be higher in fiber and lower in cholesterol than traditional meat, offering potential gut and heart health benefits. Plant-based protein alternatives, especially soy and pea protein, are also a great way to help you meet protein goals if you’re not a meat eater. One thing to note if you’re an omnivore: Plant-proteins are less bioavailable—you absorb 10-20% less protein from plant sources vs. protein from animal sources. (Also, not every plant-based protein is a complete protein —soy and tofu are, so this is less of a concern with plant-based meats). It’s the additives that are concerning. Seed oils I’ve written previously about avoiding seed oils . They aren’t inherently bad but can cause increased inflammation and disease risk when consumed in excess. Seed oils sneak into tons of packaged processed foods—even so-called “healthy” ones like plant-based meats. Most Americans are consuming a 20:1 ratio of omega-6 to omega-3 fats when we should be consuming a 3:1 ratio. Read your labels. Emulsifiers A study published last year in PLOS Medicine analyzing data from 92,000 adults over nearly 7 years found certain emulsifiers including carrageenan were linked to an increased risk of several cancers including: 15% higher risk of overall cancer 24-32% higher risk of breast cancer 46% higher risk of prostate cancer The TL;DR: Plant-based meats are certainly not the worst ultraprocessed food you could eat. But if you’re looking to maximize the health benefits of your meal, whole foods are best. What I’m doing for my own body Let’s be clear: we know that a diet high in red meat is linked to colon cancer , breast cancer, and gastric cancers . Beyond that, red meat may not be as bad for us as early research suggested. Recent meta-analyses show a neutral or weak association between red meat consumption and heart disease; these studies show that visible fat and preservatives are the biggest causes for concern. For these reasons, I eat lean, organic, grass-fed meat. It’s an excellent source of complete protein containing all nine essential amino acids, contains the most bioavailable form of iron, and is a good source of B vitamins (an important precursor for anti-aging powerhouse NAD+ ). Now that I’m in my 40s, one of my biggest health goals is to build muscle , so I’m aiming to get at least 80-100g of protein per day. My main protein source is fish , which is an excellent source of complete protein (and essential omega-3s). Since I don’t eat pork or poultry, red meat is my #2 protein source after seafood. My go-to grilling proteins are: Salmon (25g protein) Grass-fed, organic beef (22g) Shrimp (21g) Tofu (20g) What I recommend for you Choose whole foods over processed alternatives whenever possible. Sometimes processed foods are the most realistic option— I get that . But if you’re only ordering the Impossible Burger because you assume it must be better for you, go ahead and get the real thing. Choose the right red meat. When eating red meat, always opt for grass-fed. Grass-fed beef has a healthier ratio of omega-6 to omega-3 fats and contains less saturated fat. Other red meats like bison and elk are also great better-for-you burger alternatives. Both are significantly lower in calories and fat and higher in protein. Choose the right pairings. Eat your red meat alongside fiber and greens. Skipping the bun and eating a burger with a big salad or roasted veggie will lower your post-prandial glucose spike, reduce inflammation, and may help the body better absorb the nutrients in your meal. Choose healthier plant-based options. A homemade veggie burger beats a highly processed packaged food any day. This one is delicious. Do you know how your eating habits are impacting your health goals? Set up a free call with my team at Parsley Health and use my code RBMDCREW for $150 off your membership. Keep Reading Can processed & deli meats be healthy? Are seed oils toxic to your health? 10 nutrient-dense snacks I pack on-the-go Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My personal microplastics protocol
URL: https://www.robinberzinmd.com/my-personal-microplastics-protocol/
Updated: 2026-05-03 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I have a new mantra: healthier than ever. At age 43, I refuse to believe that my healthiest years are behind me, because I know they don’t have to be. My
I have a new mantra: healthier than ever. Robin’s Short Version Skip the Microwave: Heating food in plastic releases up to 4.22 million microplastic particles per square centimeter. Rethink Your Tea: One plastic tea bag releases 11.6 billion microplastics per cup — loose-leaf or paper bags are safer swaps. Heart Attack Risk: Microplastics in arterial plaques are linked to a 4.5x higher risk of heart attack and stroke per a NEJM study. At age 43, I refuse to believe that my healthiest years are behind me, because I know they don’t have to be. My goal is to make my next 10 years even healthier and more vital than my last decade. Because as much as I’d like to think 60 years out, I know that making the next 10 years as healthy as possible is truly the best path to making it to a long healthy life. To make this goal a reality, I need a plan that I can actually do as a busy mom of three, CEO, wife, daughter, and friend. So, welcome to the next era of my newsletter! I’ll be sharing my take on the latest research and health news (including what I’m doing with the information), the protocols that are working for my patients, and the daily practices and products I’m using for myself and for my family. My aim is to give you information that’s clear, to the point, evidence-based, and actionable. I also want to start an important conversation about health with this amazing, growing community, and to hear what questions you have and which topics you want me to weigh in on. There is a lot of confusion in health and wellness these days. Let’s cut through the noise together and be healthier than ever. -RB This week I got a lot of “THIS IS REALLY SCARY” messages from patients and friends after a recent study linked phthalates in plastic food containers to over 13% of all global heart disease deaths in 2018. It seems like each week brings a new microplastics headline; did you see the one about how the human brain contains 7 grams—roughly the weight of a takeout spoon—of microplastic particles ? Breathe. We are not turning into walking, talking Tupperware. But we can take steps to reduce our exposure. It’s true that microplastics are bad for us. They contain hormone-disrupting chemicals including phthalates and BPA that have been shown to increase inflammation, disrupt the gut microbiome, impair immune function, and cause oxidative stress to cellular structures. Micro and nanoplastics have now even been found in arterial plaques in patients with heart disease; a NEJM study linked these “jagged-edged particles” to a 4.5 times higher risk of heart attack and stroke. So, what can you do? Can you eliminate microplastics from your life entirely? Short answer: No. I saw an article about birds on a remote uninhabited island whose bodies are now 30% plastic thanks to their trash consumption. If that’s how it’s going on a remote island, there’s no escape in modern civilization. So then can you remove the microplastics you’ve already absorbed? Also unfortunately, no—at least not fully. But here’s what we can do: We can minimize further exposure and support the body’s natural detoxification processes. Think of microplastic exposure like sun damage. You can’t go back and undo every sunburn—but you can wear sunscreen and protective clothing to prevent a future burn, and help the body do its job healing when you are exposed. In the case of microplastics, that means helping your body release some of the harmful chemicals plastics carry with them (like BPA). Here’s what I’m doing to avoid exposure and release known toxins: ✅ Switch to glass containers. Microwaving plastic releases up to 4.22 million microplastic particles and 2.11 billion nanoplastics—from just one square centimeter. It’s why I skip hot takeout in plastic containers. Who wants chemical soup with their noodles? ✅ Choose loose-leaf or non-plastic teabags A single plastic tea bag releases 11.6 billion microplastics per cup. I love herbal tea, so I’m using loose-leaf and brands like Harney & Sons and Tea Pigs that have non-plastic, non-toxic bags. ✅ Cut back on shellfish. Mussels, clams, oysters, shrimp, anchovies, and sardines are microplastic sponges. As much as this Baltimore girl loves shrimp and crab, I lean on salmon for my omega-3s instead. I order from Seatopia , which tests every one of their products to ensure zero detectable microplastics and less than 0.1 PPM of mercury. ✅ Choose rock salt over sea salt. Sea salt comes from evaporated seawater (which now has a microplastic cocktail floating in it). Rock salt is plastic-free. Look for one without additives like Wild Pink Salt . ✅ Take a broccoli sprout supplement. Sulforaphane, found in cruciferous vegetables—especially broccoli sprouts (which have 100x higher concentration than actual broccoli)—supports the NRF2 pathway, one of the body’s natural detoxification systems. Sulforaphane can’t flush out plastic particles, but research suggests it binds to microplastic chemicals (BPA, BPS, phthalates) making them water-soluble so that the body can excrete them. I take Thorne’s Broccoli Seed Extract (50mg Sulforaphane Glucosinolate) to help my liver do this important job. ✅ Get 30-50 g of fiber per day. Beyond broccoli, dietary fiber may help remove PFOS and PFOA—two of the most common “forever chemicals” found in microplastics—from your gut. If I get 30g of dietary fiber that’s a good day—50g is a great day. What I’m Reading This Week #1 The FDA just approved the first Alzheimer’s blood test Nearly $50 billion dollars in pharma research later, and we still haven’t found a cure for Alzheimer’s. Meanwhile, we have been systematically ignoring the fact that we can get ahead of this disease, which starts developing 20 years before symptoms emerge. Being proactive with diagnostic testing is one of the ways we shift the trajectory of our health. I’m a huge proponent of testing early and often. By testing more broadly, from MRIs to bloodwork, we learn more about who really needs intervention, and we become more proactive about our health as a society. The new Alzheimer’s test approved by the FDA this month is a win for preventative health. The blood test detects amyloid plaques in the brain with over 90% accuracy, significantly improving upon the current 60% diagnostic accuracy rate. A test like this would be useless and scary however if there was nothing you could do about your Alzheimer’s risk. But that is not the case. Alzheimer’s is significantly associated with poor cardiovascular and metabolic health. (It’s sometimes called “Type 3 Diabetes.”) That means a meaningful percentage of Alzheimer’s cases are preventable or reversible . In my practice, we use protocols similar to Dr. Dale Bredesen’s paradigm-shifting ReCODE , which focus on optimizing heart health (cholesterol) and metabolic health (blood glucose) markers to lower the risk of cognitive decline and Alzheimer’s. Given 13 million people are projected to be living with Alzheimer’s by 2050, here are the people I’m telling to get this new blood test: Anyone over 55 Anyone over 30 with two copies of the APOE4 variant or one copy of the APOE4 and one copy of the APOE3 allele (By the way, before you delete your 23 and Me account, save a copy of the raw data. You can bring it to us at Parsley and we can help you analyze your genetic risks.) Anyone over 30 with diabetes, metabolic syndrome, elevated cholesterol, or a high waist-to-hip ratio (0.9 or higher for men and 0.85 or higher for women) Anyone over 30 with a family history of Alzheimer’s Anyone over 55 experiencing symptoms of cognitive decline #2 Drinking raw milk is 840 times more likely to make you sick compared to pasteurized milk. I actually appreciate why proponents of raw milk (including some of my friends) are so passionate about it. Animal milk is a living food (like breast milk)—probiotics, enzymes, immunoglobulins, proteins and fats give it much of its health benefits. The pasteurization process denatures these fats, enzymes, and immune products, and eliminates healthy bacteria, reducing a large part of milk’s nutritional value. Industrial farming practices also expose dairy products to pesticides and antibiotics. The truth is, if you’re a healthy adult, the absolute risk of getting sick from drinking raw milk is pretty low. But since there are other ways to get the nutritional benefits of raw milk that don’t also come with the risk of severe illness (especially for kids, pregnant women, and those who are immunocompromised), I don’t recommend drinking it. Here’s what I do recommend: 🥛 Make or buy nutritionally dense nut milk . Making nut milk is actually really easy. Blend nuts, water and a date (optional) in your Vitamix and strain it. If it were more complicated than that, I promise you I wouldn’t do it. When I buy milk, I buy unsweetened, organic, carrageenan-free almond or macadamia milk. 🦠 Focus on fermented dairy. Organic yogurt and kefir provide probiotics and bioactive peptides that support gut health and immune function. These offer some of raw milk’s key benefits—and they’re pasteurized first, so they’re safe. 🐮 Supplementing with bovine colostrum may benefit gut health . I sometimes prescribe it for people with intestinal permeability (aka leaky gut). #3 Is bioelectric-medicine the next frontier in longevity? I’ll never forget when I first trained in functional medicine and learned about something called the Tennant BioModulator, which uses low-level pulsed electrical currents to stimulate cells as a therapy for pain, improved cellular function, and tissue repair – I was fascinated. I had learned in my medical training that the human body is one big electro-chemical gradient. Every second, charged ions are flowing back and forth across your 37 trillion cells sending electrical impulses throughout the body. We use this all the time when it comes to heart health and cardiology (e.g. pacemakers); but I always found it strange that we don’t use this fact more broadly in therapeutics. So this week I was excited to see the WSJ article on two new devices that harness the body’s electrochemical gradients. SetPoint Medical is developing an implantable device that stimulates the vagus nerve to regulate inflammation in rheumatoid arthritis patients. In clinical trials, 50% of patients experienced symptom relief after six months. The company is seeking FDA approval and plans to test the device for conditions like Crohn’s disease and multiple sclerosis. Another device from Novocure employs low-intensity, alternating electric fields to interfere with cancer cell division; it’s already approved to treat glioblastoma and mesothelioma, with ongoing trials exploring pancreatic and lung cancers. I think that non-pharmaceutical therapeutics for chronic disease are truly the next frontier and that harnessing the energy currents of our bodies to heal makes so much sense. I’m excited to see this field evolve. For now, maybe it’s time to stop making fun of our friends with their amethyst ion mats after all! If someone wants to send me one, at this point I wouldn’t say no 🙂 And if you don’t have an ion mat, a reminder that practices like deep breathing, meditation, cold exposure and even humming can activate your vagus nerve. How to be healthier than ever this week 🔥 Love as medicine: Recently I had a very fun talk with my friend Dr. Erika Siegel on the role of love and relationships in building a comprehensive longevity protocol. Don’t miss the key takeaways I shared on Instagram . 🍳 Replace your nonstick: I’ve been loving my Caraway pans . Non-toxic (free of forever chemicals and microplastics), nonstick, and they actually look good on the stove. Use my discount code: ROBIN10 for 10% off. 🫒 Drink your EVOO: A study of 90,000+ people found that consuming 1 tablespoon of olive oil daily cuts dementia-related death risk by 28%. Wild. I down a spoonful of the good stuff every morning with my supplements. Ready to be healthier than ever? Make sure you’re subscribed ! Keep Reading Mold Symptoms: Are Mycotoxins Behind Your Illness? My personal supplement stack. Are seed oils toxic to your health? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My personal supplement stack.
URL: https://www.robinberzinmd.com/my-personal-supplement-stack/
Updated: 2026-05-03 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I get asked so often from people if the supplements they are taking are legit, I feel like I should set up a roadside stand with a sign that says: “Will ev
I get asked so often from people if the supplements they are taking are legit, I feel like I should set up a roadside stand with a sign that says: “Will evaluate your supplement stack for $10K.” Always good to have a backup plan, right? 😉 Robin’s Short Version Certification Over Brand: NSF- and GMP-certified or professional-grade brands like Thorne are far safer than Amazon or pharmacy options, which can be counterfeit or nearly useless. Hormone Supplements Are Slower: Most supplements take 2–3 weeks to show results, but hormone-supporting supplements require a full 2–3 months before you can fairly judge whether they’re working. Test, Don’t Guess: Regular functional lab tests are the only reliable way to confirm a supplement is actually moving the needle and worth the cost. I also get asked to promote consumer supplement brands constantly. Supplements arrive at my house unannounced daily—my family is practically swimming in them. But I’ve never worked with an outside supplement brand to promote it other than two companies I love, respect and trust: Ritual (I became an advisor almost a decade ago and weighed in on the formulation of the original prenatal), and Seed, whose rigor around science and quality have truly impressed me. (Maybe a coincidence, but both are run by incredible women!) Can supplements be powerful tools for longevity and even disease treatment? Yes. Do you need more than a multi-vitamin? Also yes. But are most of the supplements on grocery store and pharmacy shelves a waste of money? Yes again—you might as well be taking sawdust. Here’s what I see on repeat: people spinning between 10+ supplements on rotation on their kitchen counter, with zero idea if they’re high-quality or if they’re actually working. They’re spending way more money on products on Amazon and TikTok ads than they are on testing and medical care—things that will actually move the needle. Yikes. Let’s clean that up. So, what can you do? Short answer: Ideally, work with a supplement literate provider who uses personalized medicine to help you choose the most effective, bioavailable, and safe supplements for your individual biology and health goals. Also ensure that, like in my practice, your doctor does not make more money if they recommend supplements. (Real talk: Parsley doctors and coaches are not financially incentivized to recommend supplements, ever . Their salaries are the same if they recommend zero supplements or five. Not all practices are like this.) Longer answer : Vetting supplements on your own takes a little time but is more than worth the payoff. Here’s how I screen for safety and efficacy: 🕵️‍♀️ Look for certifications and bioavailability. Big-name stores (looking at you, Amazon + CVS) don’t guarantee quality. There are a lot of counterfeits (especially online) and low-quality crap out there . Here’s my gold standard: ✅ NSF-certified → Third-party tested for what’s actually inside (and what’s not, like heavy metals). ✅ GMP-certified → Made in clean, professional-level facilities. ✅ Professional Grade → Trusted brands sell through licensed providers and therefore have to meet our quality standards. Think: Thorne, Metagenics, Orthomolecular. These are some of the brands that manufacture our Parsley Health supplement line. ✅ Bioavailable → You get what you pay for—top brands use the most bioactive ingredients and research-backed formulations. Think: more effective formulations like methylated forms of Folate and B12, iron that comes with Vitamin C, and curcumin formulated with black pepper. 🕒 Give it time to work! Don’t expect magic overnight. Most supplements need 2-3 weeks (or in the case of supplements to support hormone health, 2-3 months) to show results. Stop adding to your “supplement graveyard” of half-empty bottles you ditched after a few days. 🩸 Test, don’t guess. Your body is a data goldmine. The only way to know for sure if a supplement is moving the needle is by getting regular functional lab tests, measuring biometrics like lean muscle mass and sleep quality, and tracking your symptoms with a measurable symptom score . If the supplements are working you’ll see your markers and your symptoms improve. If this tells you anything it should be how serious I am about keeping it tight when it comes to supplements. I hope you do the same. All the ineffective supplementation I’ve seen out there is why I became a clinical advisor at SuppCo . The app does what I wish I could personally do for everyone of you—it helps you make sense of which supplements are right for you, which products are actually high-quality, and how to take them properly. (P.S. I’m super proud of how well Parsley’s supplements scored—we’re in the top 5% of all supplements on the platform for quality. We walk the walk.) I probably get asked the most about supplements for GI issues, so I worked with the SuppCo team to design two gut health protocols to help you figure out which supplements will actually increase your microbiome diversity, reduce gut inflammation, and support gut barrier repair. Check them out! My personal supplement stack I love my supplements and use them for targeted reasons from optimizing longevity and long-term bone health, to improving my sleep and mood. But! I’m extremely careful about the supplements I take. I’m militant about quality and sourcing for myself, my family, and for our patients at Parsley. Here’s what I personally take because I’ve tested, tracked, and know it works. Parsley Magnesium Glycinate For deeper sleep, more calm, and bone building support. Parsley Rebuild Clean Protein Powder For 26g of plant-based clean protein (enhanced with BCAAs to make it a complete protein source) I can build muscle with. Thorne Curcumin Phytosome For anti-inflammatory support and metabolic health optimization. Parsley Daily Dose Multivitamin For my daily dose of methylated B vitamins— which my mood relies on —and critical minerals like zinc. Parsley Vitamin D3 + K2 For immune and bone health as well as mood support. Pure Astaxanthin For antioxidant support and cellular energy. Parsley Omega3 For short- and long- term brain health. Seed DS-01 Daily Synbiotic For supporting a healthy microbiome and keeping my digestion regular. Thorne Creatine For supporting lean muscle mass now that I’m lifting. Thorne Collagen For supporting skin elasticity and aging. Sakara Fiber For hitting my fiber goals of 30-50g per day. Host Defense Mushrooms MycoBotanicals Brain For optimizing mental clarity and neuroplasticity. Metagenics Indole-3-Carbinol For hormone balance. If you need some help figuring out which supplements are right for you, I highly suggest checking out my roadside stand—it’s called Parsley Health and we will run the right tests, assess your clinical history and health goals, and get you on the right track for your stack. Use my code RBMDCREW for $150 off your Parsley membership. Keep Reading My personal microplastics protocol Omega-3 deficiency is as harmful as smoking Is NAD+ the key to energy and longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Can processed & deli meats be healthy?
URL: https://www.robinberzinmd.com/can-processed-deli-meats-be-healthy/
Updated: 2026-04-05 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Here’s my controversial take: When eaten the right way, deli meat is a great source of protein and healthy fat.
One of the healthiest things you can do for your body is pack your own lunch. And one of the easiest things to pack is a deli meat sandwich. But if you’ve been following the headlines on the dangers of ultra-processed foods , the idea of serving yourself (let alone your children) a sandwich packed with slices of processed deli turkey, ham, or roast beef might seem anathema to anyone hoping to avoid heart disease , diabetes , cancer , and anxiety . Robin’s Short Version Processing Tier Matters: Counter-sliced deli meat is minimally processed, putting it in a different category from pre-packaged meats linked to a 50% higher risk of cardiovascular death. Nitrates Are Key: Cancer risk is concentrated in cured, nitrate-containing meats — uncured options with no synthetic nitrates carry a genuinely different risk profile. Build the Right Plate: Pairing deli meat with fiber, healthy fat, and vegetables directly offsets the sodium load and blood sugar impact that make it a dietary concern. Most deli meat is processed. If you buy it, choose minimally processed options with short ingredient lists and no direct nitrites/nitrates, artificial preservatives, or vague flavor additives. Best bets: Applegate Naturals, Applegate Organics, Boar’s Head All-Natural, True Story, Diestel Even better: Roast and slice your own chicken Here’s my controversial take: When eaten the right way, deli meats are a great source of protein and healthy fat. I realized what an important issue this was to discuss after seeing the reactions to an Instagram story I posted with a photo of a meal I often prep for my kids: High-protein chickpea and turmeric pasta tossed with a high-quality EVOO , cucumbers, and a few slices of— gasp —soppressata. A lot of you freaked out (to put it lightly). Are you seriously eating processed meat? Isn’t soppressata carcinogenic?! The controversial deli meat in question. Here’s what the latest science says about processed proteins like deli meat and cured meat, how to consume them responsibly, and what I personally pack in my lunch (and yes, my kids’ lunches, too). Nutrition advice changes constantly. In Off Script, I break down what’s actually evidence-based – and what’s noise. The research says There are three types of foods: unprocessed, processed, and ultra-processed. Choose unprocessed foods —think: whole fruits, veggies, fresh meat and fish (i.e. not smoked or cured), and whole/unaltered grains and legumes— whenever you can. They retain their full fiber, protein, healthy fats, vitamins, and minerals. They are also the least likely to be high in fat or added sugar. Processed foods — like canned or frozen veggies, fruit juice, nut butters, tofu, EVOO, and some deli meats sliced fresh at the counter —are foods that have been minimally altered. They definitely have a place in a healthy diet, though they often require a little more scrutiny to avoid consuming excess sodium and added sugars. The TL; DR: some are healthier than others. Ultra-processed foods (UPFs), which now make up an estimated 60-90% of the average diet , are bad news. Think: Bacon, hot dogs, pre-packaged meats, french fries, packaged bread, cereal, sweetened yogurt. Earlier this year, a massive meta-analysis of studies on ultra-processed foods , published in the British Medical Journal and involving data from over 10 million people, found a link between consuming UPFs and over 30 serious health problems including: 50 percent increased risk of cardiovascular disease-related death 48-53 percent increased risk of anxiety and other mental disorders 12 percent increased risk of Type 2 diabetes UPFs are also highly addictive to the point that some scientists are proposing a new mental-health condition called “ ultra-processed food use disorder .” What I’m doing for my own body The takeaway: Deli meat isn’t the healthiest thing you can eat but not all deli meat is created equal. I think we’ve thrown the baby out with the bathwater in writing off the entire category. Here’s where I’m coming from: Animal proteins like turkey and chicken are excellent sources of protein and healthy fat. They’re also exceedingly convenient ingredients for on-the-go lunches. Ideally, if I wanted to make my kids a turkey wrap for lunch or make myself a healthy snack box to help me meet my protein goals , I’d roast a turkey myself and carve it up in slices. But…who has time for that? With three kids and a full-time job, certainly not me. That means choosing meat that’s been processed to some degree. Pre-packaged deli meat is usually ultra-processed. It can be filled with “ undesirable ” animal parts used as filler, loaded with sodium and added sugars (especially honey roasted versions), and typically contains nitrates and nitrites—additives used as preservatives, which are linked to cancer . The better option is meat sliced fresh at the deli-counter. It’s processed, yes, but these meats tend to contain less added sugar or sodium than the pre-packaged versions sold in the refrigerator section. What you eat with your deli meat of choice is also important. I always pair processed meat with greens and a source of healthy fiber (like the chickpea pasta I paired with the soppressata for my kids, lentils, or brussel sprouts roasted with EVOO). I’ll take a home-made lunch that includes minimally processed deli meat, fiber, and veggies over a dubious takeout option any day. What I recommend for you So, is there any healthy way to eat processed meats? Yes. If you follow these steps: 1. Round out the deli meat with healthy sides. If your entire lunch consists of deli meat and packaged bread, day after day, yes that’s bad. Pair your processed protein of choice with lots of cut up veggies, whole unprocessed grains like quinoa, and high fiber sources like nuts and seeds. 2. Choose fresh-sliced meat from the deli counter whenever possible. Opt for low-sodium versions if they’re available, and stay away from “honey-roasted” varieties, which contain added sugars. 3. Choose “uncured.” I always buy uncured soppressata for my family. It’s aged naturally with no nitrates or nitrites and isn’t loaded with excess salt. 4. Read nutrition labels. The more ingredients on the list, the more processed the meat. Opt for versions that contain as close to 50% protein and 50% fat as possible (i.e. fewer added sugars or fillers). Deli meat brands I personally recommend: Applegate All of their deli meats are “ minimally processed ” and don’t contain artificial flavors, colorings, or preservatives. My go-to if I can’t get to the deli counter. Boar’s Head All-Natural Surprisingly, Boar’s Head has some not-so-bad options. They have an “all-natural” line that’s made without preservatives and offers several uncured options. Amylu In a pinch, this brand has minimally processed chicken sausages and burgers that are great for lunches. Fork in the Road This brand has an uncured hot dog made from hormone-free, grass-fed beef that is better than many of the alternatives for ultra-picky kids. Frequently Asked Questions What is the healthiest deli meat? There’s no truly healthy processed meat, but if you’re going to buy deli meat, choose minimally processed options with short ingredient lists and no direct nitrites or nitrates, artificial preservatives, or vague additives. Robin’s better brand options include Applegate Naturals, Applegate Organics, Boar’s Head All-Natural, True Story Foods, and Diestel Family Ranch. Is deli meat processed? Most deli meat is processed, even when it looks simple or is labeled “natural” or “uncured.” Traditional deli meats often contain preservatives, additives, and sodium. Even “uncured” meats may still use celery powder or celery juice, which are loophole ingredients that contain natural nitrates. Are “uncured” deli meats healthier? Not necessarily. “‘Uncured’ meats with celery powder still contain natural nitrates.” Robin recommends scanning ingredient lists for celery powder, celery juice, or vegetable juice, since those are often the loophole ingredients. What ingredients should I avoid in deli meat? Avoid sodium nitrite, sodium nitrate, BHA/BHT, carrageenan, and watch for dextrose, modified starch, natural flavors, honey, and polysorbate 80. What brands are better options? Robin names Applegate Organics, Applegate Naturals, Boar’s Head All-Natural, True Story Foods, and Diestel Family Ranch. Looking for a personalized plan to lower your disease risk? Come talk to one of our experts at Parsley . Use my personal code RBMDCREW for $100 off your membership. Keep Reading 10 nutrient-dense snacks I pack on-the-go Are plant-based meats just ultraprocessed food in disguise? My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## 10 nutrient-dense snacks I pack on-the-go
URL: https://www.robinberzinmd.com/10-nutrient-dense-snacks/
Updated: 2026-04-05 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Eating healthy when you’re traveling feels impossible, I know. These are the nutrient-dense snacks I throw in my bag to avoid feeling bloated and foggy.
I hear this all the time from patients: Robin’s Short Version Sugar’s True Scale: The average American consumes 152 pounds of sugar yearly—nearly their own body weight—fueling heart disease, diabetes, cancer, and accelerated aging. Snacks Affect Cognition: A 10% increase in ultra-processed foods raises your risk of cognitive impairment by 16–25%, making every snack choice a brain health decision. Pre-Stock, Don’t Scramble: Dr. Berzin shops one to two days before travel so she arrives with healthy options instead of defaulting to airport or hotel food. I was on the road and I kind of fell off the wagon when it came to eating healthy. I know what to eat but it was vacation / a work trip / was with my kids. I’m here seeing you because wow my skin flared / I’m super bloated / my sleep is a mess . I just got back from two weeks at the beach with my family and said to myself, Ugh, why am I feeling kind of meh right now? Then I immediately had that DUH moment that comes when you forget your own advice. I completely slacked on eating nutrient-dense snacks. I inventoried what I had been eating and drinking on my vacation and my culprit was clear. (Let’s just say I had indexed unusually high on Cape Cod potato chips, lobster rolls, burgers from the beach general store, flavored sparkling waters, and wine, natural though it may have been). I felt bloated, foggy, tight from so much sitting in the car, and my sleep was terrible. Hello! I’m also starting down a fall full season of work travel, and so based on my summer experience and the climb ahead of me, I thought it could help us both if I wrote down exactly what I need to eat on the move to feel healthy and sharp. The research says The Standard American Diet (also known as the SAD) is both highly inflammatory and highly processed. The average American eats 152 pounds of sugar a year. Given the average American woman weighs 170 pounds, we are almost literally eating our own weight in a food linked to heart disease , diabetes , cancer , Alzheimer’s , and cellular aging . Let that sink in. Meanwhile, recent research estimates 73% percent of the American diet— including kids’ diets —is ultra-processed or ultra-refined. These are not real foods. They’re frankenfoods. They are toxic to the body and disruptive to almost every system: the immune system, the gut, the brain, your hormones. Even just a 10% increase in ultra-processed foods in your diet (like, say, the errant packaged snack that becomes a regular thing) has been linked to a 16-25% increase in the likelihood for cognitive impairment in recent research . The bottom line: better nutrition is an evidence-based lever for better health. (To hear me sound off how the Standard American Diet leads to Standard American Diseases, tune in to my recent interview with the hosts of Second Opinion on Apple podcasts , Spotify , or YouTube .) What I’m doing for my own body Okay so avoid ultra-processed empty calories—this is all well and good in theory. But how do you actually avoid these foods when you’re starving and they’re seemingly the only options around? How do I avoid them on-the-go? I follow three principles: Pre-stock. I do a shopping trip a day or two before I travel to stock my suitcase with healthy options. This way I’m not arriving at the flight empty-handed left to scavenge the airport, or defaulting to whatever the hotel or vacation destination has to offer. I come ready! Have a few go-tos. I keep a running mental list of healthy grab-and-go nutrient-dense snacks that you can find at basically any grocery store (and often, coffee shops). Fresh fruit, obviously, but also string cheese, nut butter packets or packets of raw nuts, and no sugar added jerky. When I don’t have time to pre-pack, knowing that I can divert the Uber to any Whole Foods, Trader Joes or Stop & Shop and get something to keep me going keeps me focused. Mind my macros. I’ve recently started paying a lot more attention to my protein intake . I aim to get at least 80g per day and am trying to get closer to 110-120g. To meet this goal, I can’t afford to eat empty snack calories. I look for on-the-go foods that help me reach my goal of 1 gram of protein per pound of body weight and less than 25 grams of sugar per day. I am also mindful of fiber and getting at least 30 grams a day to keep my gut happy. The nutrient-dense snacks I recommend for you These are my personal go-to nutrient-dense snacks to help me meet my protein and fiber goals and avoid blood sugar spikes. They’re not all nutritionally perfect, but they’re a lot better than most ultra-processed convenience foods. Epic Bison Jerky It tastes better than beef jerky (to me at least) and it’s leaner. Just make sure you watch out for added sugars in all jerky. 10g protein, 7g fat, 2g carbs, 0g sugar Wild Zora Paleo Meals to Go These ready-made meals are perfect for camping or a long beach day. (I also like Wild Zora’s dried fruit mixes, which are great nutrient-dense snacks with no added sugar, dyes, or sulfates.) 29g protein, 2g fat, 39g carbs, 15g sugar Nature’s Promise Organic Mozzarella String Cheese These are especially good for picky kids. (If you can’t find this brand, I also like Organic Valley and Wild Harvest.) 7g protein, 6g fat, 0g carbs, 0g sugar Justin’s Organic Almond Butter Packets Plenty of options on grocery shelves, but I like Justin’s packets because they have no added sugar or salt. 6g protein, 19g fat, 5g carbs, 1g sugar Sakara Life meals I like their 2-day meal option if I’m on a longer trip. It takes care of enough days that I feel like I get my 30 grams of fiber in easily, while giving me the flexibility to eat what I want the other days, or save one of their meals for a meal I know I want to BYO. This will be how I survive a few healthcare conferences this fall! (Use my code ROBINBERZINSAKARA for 20% off their Meal Program or Supplements .) BjornQorn Popcorn A filling alternative to chips, non-sweet popcorn is also great for fiber intake (3 oz of BjornQorn has 10g). 4g protein, 8g fat, 14g carbs, 0g sugar Hard boiled egg with sea salt Requires a little advance prep but totally worth it. 6g protein, 5g fat, 0g carbs, 0g sugar Siggi’s Plant-Based Coconut Yogurt Great for the dairy-free amongst us! 11g protein, 12g fat, 8g carbs, 4g sugar Primal Kitchen protein bars I try to pick whole foods over protein bars (which are often laden with sugar) when I can, but sometimes you can’t beat the convenience. I like Primal Kitchen’s bars as they’re an awesome source of 6 grams of fiber. 15 g protein, 16g fat, 13g carbs, 3g sugar Raw almonds I almost never go anywhere without a little baggie of raw almonds; eat them alone or pair them with a higher fructose snack like an apple to help balance blood sugar. 6g protein, 14g fat, 6g carbs, 1g sugar Reviewing the above, I am at no risk of feeling bloated and foggy on my trip, my kids will eat 80% of this list, and I’m not breaking the bank. Order going in! Want personalized nutrition recommendations? Get started with Parsley Health . Use my personal code RBMDCREW for $100 off. Keep Reading How to Pick a Protein Bar That’s Actually Healthy How Much Protein Should You Really Be Eating? 4 fasting for women strategies to optimize longevity. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is estrogen the ultimate longevity drug?
URL: https://www.robinberzinmd.com/is-estrogen-the-ultimate-longevity-drug/
Updated: 2026-04-03 · Topics: Women’s Health & Hormones
Summary: What if one hormone could slash your risk of heart disease, stroke, breast cancer, and Alzheimer’s? That’s the potential of estrogen therapy.
Plus, the sport that can add 10 years to your life. Robin’s Short Version Timing Is Everything: Starting estrogen in perimenopause—not after—is linked to a 60% lower risk of breast cancer, heart attack, and stroke. The WHI Got It Wrong: The study used synthetic hormones on women 10+ years post-menopause—the wrong drug, wrong formulation, and wrong window of time. Decline Starts at 35: Estrogen begins dropping in your late 30s and falls 85–90% at menopause, raising risk for Alzheimer’s, bone loss, and heart disease. What if one hormone could slash your risk of heart disease, stroke, breast cancer, and Alzheimer’s by 60%? That’s the potential of estrogen therapy done right, according to emerging research presented last month at the annual meeting of The Menopause Society. Estrogen isn’t just about hot flashes and menopause. It’s the master regulator of female longevity; when started at the right time, it can literally slow biological aging. Yet only 5% of women are currently using HRT ( JAMA Health Forum , 2024). Why? Two decades ago, estrogen’s reputation was destroyed overnight. A misreading of the Women’s Health Initiative (WHI) study in the early 2000s led to widespread fear that hormone therapy caused breast cancer. Yesterday, the U.S. government announced it is finally removing the black box warning on menopausal HRT to reflect the latest understanding of the research. Here’s what you need to know. 🤓 What to know: Estrogen is the master regulator of women’s longevity. I’ve said it before and I’ll say it again: there’s no better longevity drug for women than estrogen. The fresh data presented at The Menopause Society backs that up big time. Researchers analyzed 120M+ medical records and found: Women who began estrogen therapy in perimenopause and stayed on it for 10+ years had a 60% lower risk of breast cancer, heart attack, and stroke. Women who started HRT after menopause had a slightly lower risk of breast cancer and heart attack but a 4.9% higher risk of stroke. 🌟 Benefits of estrogen: The Menopause Society data backs up the last two decades of research on estrogen and longevity: 🧠 Brain Estrogen supports mood, memory, and cognition (serotonin, dopamine, glutamate, gaba, and BDNF expression) → estrogen loss is linked to brain fog and higher Alzheimer’s risk ( Frontiers in Molecular Biosciences , 2025). 💪 Muscle + Metabolism Estrogen helps maintain lean mass and insulin sensitivity → when estrogen drops, risk for metabolic syndrome and diabetes increases ( Biomedicines , 2023). 🦴 Bones Regulates bone remodeling → women can lose up to 20% of bone density within 5 years of menopause without HRT ( Endocrine Society ). ❤️ Heart Maintains flexible arteries and healthy cholesterol → estrogen decline spikes post-menopausal heart disease risk ( Archives of Medical Science , 2022). 🔥 Inflammation Acts as a systemic anti-inflammatory → drop in estrogen accelerates cellular aging ( JAMA Network Open , 2024). 💦 Skin + Sexual Health Boosts collagen, hydration, elasticity ❌ Why did estrogen become the villain? In the early 2000s, the Women’s Health Initiative (WHI) study sent shockwaves through medicine. It reported that hormone therapy increased the risk of breast cancer, heart disease, and stroke. Millions of women stopped HRT overnight. But here’s what was missed: The WHI used oral synthetic hormones (Premarin and Provera), not bioidentical estrogen. Most participants were 10+ years past menopause , when arteries and tissues were already less responsive. In other words: the wrong hormones, given to the wrong women, at the wrong time. Later analyses of the WHI data flipped the script. Estrogen, when started early and dosed right, reduces the very risks we feared. ⏳Why estrogen matters after 35 Estrogen is not just a “menopause hormone.” It peaks in your 20s and early 30s, starts decreasing in your late 30s, and plummets 85–90% during menopause ( Trends in Molecular Medicine , 2013). Estrogen comes in 3 forms: Estradiol (E2) – strongest, dominant pre-menopause Estrone (E1) – made after menopause from fat Estriol (E3) – weaker, dominant in pregnancy; used in vaginal estrogen Estrogen is made in your: Ovaries (main source pre-menopause) Adrenals + body fat (post-menopause backup system) Muscle (converts testosterone into estrogen via aromatase) 🚨This is why women with more muscle and better adrenal health tend to have smoother transitions into menopause. 🔍 Hormone therapy: What we know now When started within 10 years of menopause (or before age 60), estrogen therapy can: ✅ Lower risk of cardiovascular disease and all-cause mortality ( Cancer Journal , 2023) ✅ Lower risk of osteoporosis and fracture ( Osteoporosis International , 2022) ✅ Lower risk of Alzheimer’s disease ( Alzheimer’s Risk and Therapy , 2024) ✅ Slow biological aging ( JAMA Network Open , 2024) ✅ Improve ability to build and maintain lean muscle mass post-menopause ( Frontiers in Physiology , 2021) ⚠️ For women with a history of breast cancer , systemic HRT is generally not recommended because of recurrence risk. Local estrogen (like vaginal estriol) is often safe—always consult your provider ( Menopause , 2025). 💪What to do: Track hormones after 35, work with a hormone-literate provider, start HRT within 10 years of menopause. Every woman should have an informed conversation about the preventive benefits of estrogen as a longevity tool. 🧪 Step 1: Start tracking hormone levels at 35. Get baseline levels of: Estradiol (E2) Progesterone Testosterone FSH and LH (for menopausal status) SHBG (affects free hormone availability) Thyroid + metabolic markers (they influence hormone balance) Hormone levels can fluctuate wildly during perimenopause but tracking early can help you notice trends over time. ⌚Step 2: Use a wearable to track symptoms. Devices like Whoop can help flag changes in sleep, temperature, or cycle length—early clues that your hormones are shifting. Pair this with a symptom log. Symptoms + hormone levels + cycle trends help inform your treatment plan. 🌿 Step 3: Support estrogen naturally. HRT works best alongside lifestyle medicine: Prioritize protein + resistance training for bone and muscle Balance blood sugar to reduce estrogen dominance Manage stress and sleep to stabilize cortisol, which affects estrogen metabolism 🧑‍⚕️Step 4: Find an HRT-literate provider. If your PCP or gyno is telling you HRT is dangerous, their information is out of date. Work with someone who understands: Bioidentical hormones Timing windows Your unique health history and risk profile. Smart estrogen therapy is highly individualized. The point is to have an informed conversation early. Like my board-certified team at Parsley . This is our jam. ⏳ Step 5: Start HRT within 10 years of menopause. Starting estrogen therapy within 10 years of menopause onset lowers risk for heart disease, dementia, and bone loss ( International Journal of Women’s Health , 2014). The new data makes the case that earlier is even better. Ask your doctor whether starting during perimenopause might be right for you. 💊 Step 6: Consider bioidentical estrogen. Bioidentical = matches your body’s own hormones Transdermal patches (like Vivelle-Dot) = safest, best-tolerated Compounded creams = flexible dosing for in-between needs Vaginal estriol = minimal systemic absorption 👉 Start low, go slow. Most women feel best with levels that mimic their 20s–30s (E2: 50–100 pg/mL). ⚡Quick Hits 🎾 Tennis is the #1 sport for longevity A 25-year study found people who play tennis live nearly 10 years longer than sedentary peers, outpacing those who prefer cycling (+3.7), swimming (+3.4), jogging (+3.2) and gym-goers (+1.5). Why? Researchers think the combo of movement and built-in social connection gives tennis an edge. Time to grab a racket? 🩸The best-priced full functional labs—finally Run, don’t walk people! Parsley Health now offers the most affordable comprehensive lab panel on the market covering 80+ labs (hormones, inflammation, metabolism and more) for just $350. The best part? Only 1 lab draw is needed for the full panel. (The other companies out there make you go twice in a week—who has time for that?) Sign up here ! 🧬 Mitochondrial reboot in a pill? A new 4-week trial found that 1,000 mg of urolithin A made immune cells act younger, rewiring them to burn cleaner, mitochondria-powered fuel instead of quick sugar. The result: stronger immune readiness without added inflammation. A Urolithin A supplement may also help you maintain lean muscle mass. 💛 The Momgevity Files Last week, I took three days for a solo retreat in Santa Fe. Between new product launches, nonstop kid chaos, and the general pace of life, I realized I couldn’t hear myself think. So I asked my husband to hold down the fort so I could take a few days to pause—reset my nervous system, reflect on 2025, and plan for 2026. I chose Santa Fe intentionally. I considered LA, but I knew I’d get pulled into the office and swept up in social plans or work commitments. Instead, I picked somewhere I’d never been known for its art, landscapes, and vortexes: places believed to amplify clarity and transformation. It delivered. I had Tibetan energy work from an incredible healer (who told me I’ll be fully fertile until 53!!—not testing that theory 😅). I went to Ten Thousand Waves, the famous Japanese hot spring spa, and had one of the best massages of my life. I drove to Taos for a blue-sky hike along the Rio Grande Gorge, journaled leisurely over an egg-and-mushroom rice bowl, wandered galleries, and met up with my friend and long ago yoga teacher, Elena Brower, whose new book Hold Nothing is about to launch. Elena recommended the Upaya Zen Center, where I joined two 7 a.m. meditations—just me in my sweats and twenty monks in black robes. It was humbling, quiet, and exquisite. Each day, I set aside time to write, reflect, and ask myself: The past 10 years have been extraordinary. What do I want for the next 10? If all of this sounds indulgent—it is. That’s the point. It’s also essential. One of the real keys to longevity, at least in my life, is creating space. I’m not great at slowing down or saying no—it’s just not in my nature. If I don’t carve out time intentionally, it won’t happen. So I treat it like a work trip. Only in this case, it was a self-led reset. The insights I found weren’t the kind that come during a walk around NYC. In meditation, my son appeared to me—with clarity about what he needs from me as an ADHD mom. I also found direction for where I see Parsley going in the new year (more on that soon). Reconnecting with Elena reminded me why I fell in love with this medicine in the first place. Fifteen or so years ago, in a workshop, she had us write out our dream lives in detail. What I wrote that day became the blueprint for everything I’ve done since. One of the biggest realizations from this trip: I’ve spent much of the last decade in CEO mode—and I miss doctor mode. That’s why I love writing this newsletter. It’s a passion project that keeps me close to the medicine I fell in love with years ago, and the reason I created Parsley and the life I live today. In longevity, we talk a lot about sleep, supplements, and recovery but not enough about reflection. And reflection, by definition, requires space. Space to listen. Space to reorient toward what matters. If you can, take a sacred pause. A day, a weekend—something just for you. Step far enough away from the noise to hear your own thoughts again. One of my best friend’s moms always said, “Where your eyes go, your car goes.” Sometimes, when you can’t see what’s ahead, you just need to stop, reset your gaze—and let the vision for what’s next come into view. Once your eyes can see it, the rest will follow. Stay strong, stay curious, and breathe. Robin Keep Reading Testosterone Therapy Is Trending—But Is It Right For You? Your bone density blueprint My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Omega-3 deficiency is as harmful as smoking
URL: https://www.robinberzinmd.com/omega-3-deficiency/
Updated: 2026-04-03 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Supplementing with omega-3s is one of the most powerful things you can do for longevity, heart health, and slowing biological aging.
In all the conversations I have with friends, patients, and colleagues about longevity, one nutrient continually comes up: omega-3s. Robin’s Short Version Mortality Risk Matches Smoking: Per the Framingham Heart Study, higher EPA and DHA levels in red blood cells predicted reduced all-cause mortality as strongly as not smoking. Cellular Aging Slows: Higher omega-3 levels link to longer telomeres and lower cortisol during stress, meaning supplementation may literally slow how fast your cells age. Deficiency Is the Norm: 80–90% of Americans are omega-3 deficient, making EPA and DHA supplementation one of the highest-impact longevity interventions most people aren’t taking. Omega-3s are polyunsaturated fatty-acids (PUFAs) which are essential for human health. They are a vital part of every cell in your body, acting as a structural component in cell membranes and regulating everything from intercellular communication, to inflammation, to hormone production. The body does not produce omega-3s on its own—we have to get them through dietary sources. The most bioavailable forms of omega-3 are found mostly in seafood: eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Alpha-linoleic acid (ALA), an omega-3 precursor, is also a common plant-based dietary source. Omega-3s support literally every system in the body. Major impacts include: Heart health: EPA and DHA lower triglyceride levels, reducing the risk of heart disease. They also help reduce inflammatory markers including C-reactive protein (CRP) and interleukin-6 (IL-6). Brain health: As a key structural component of brain cells, omega-3s are vital for neuroplasticity and cognitive function. The anti-inflammatory benefits also help prevent mood and neurodegenerative disorders. Metabolic health: Studies show omega-3s can improve insulin sensitivity and glucose metabolism, which may make them a key factor in preventing diabetes and metabolic disease. Bone health: Omega-3s support the formation of osteoblasts and inhibit osteoclasts (the cells that break down bone cells). Immune function: In addition to their anti-inflammatory properties, omega-3s support the gut microbiome, which houses 70-80% of the body’s immune cells. One important study published in the American Journal of Clinical Nutrition found Omega-3s are so vital that being deficient carries the same mortality risk as smoking. The bad news: There’s a very good chance you’re low in omega-3s—80-90% of Americans are omega-3 deficient. The good news? Upping your omega-3 levels is an easy fix. Here’s what to do: The research says To determine the role of fatty acids in mortality risk, researchers used data from the Framingham Heart Study , spanning a follow up period of 11 years. They found that people with higher percentages of EPA and DHA measured in their red blood cells had a reduced risk of all-cause mortality. The amazing part was that having higher omega-3 levels was as strong a predictor of reduced mortality than not smoking. In other words, increasing omega-3 intake may be as beneficial for longevity as quitting smoking . Another groundbreaking study published in Nature Molecular Psychiatry the same year examined the effects of omega-3 supplementation on cellular aging. They found that higher levels of omega-3 track with longer telomeres, lower inflammation, and reduced cortisol activity during periods of stress. “By lowering overall inflammation and cortisol levels during stress and boosting repair mechanisms during recovery, omega-3 may slow accelerated aging and reduce depression risk,” the study concluded. TL;DR: supplementing with omega-3s is one of the most powerful things you can do for longevity, specifically reducing risk of cardiovascular disease and slowing biological aging. What I’m doing for my own body Because I live the Parsley life, I already eat a diet rich in EPA and DHA and take a high-quality fish oil supplement. (More on those below.) But because I know my omega-3 index is vital for every single one of my health goals, I want to go above and beyond. Eat foods rich in ALA. Alpha-linolenic acid (ALA) is a precursor to EPA and DHA, the most bioavailable forms of omega-3. It’s less efficiently converted, but still an important PUFA source—especially from plants. In addition to 3-4 weekly servings of fatty fish, I aim to incorporate lots of chia seeds, flaxseeds, hempseeds, and walnuts into my snack habits. Optimizing my omega-6 to omega-3 ratio. As a person living in the modern world it’s too easy for omega 6s to sneak into your diet. In my deep dive on seed oils , I go into detail on the difference between omega-6s and omega-3s and exactly how to make sure you’re getting optimal levels of both. The TL;DR: you should aim for a 3:1 (or even better 1:1) ratio of omega-6s to omega-3s to lower your risk of inflammation and disease. For context, most people are getting closer to 20:1. My philosophy is, the more omega-3s, the merrier. To keep my ratio in the optimal range, I: Drink a teaspoon of high-quality olive oil daily and take a high-quality fish oil supplement Avoid packaged foods whenever possible Cook with high-quality olive oil or avocado oil rather than seed oils like canola Opt for grass-fed over grain-fed meat Protect omega-3s with antioxidants. Omega-3s are highly vulnerable to oxidation, meaning they can break down easily and contribute to inflammation—exactly the opposite of what we want them to do. Antioxidants including Vitamin E and Glutathione both help stabilize omega-3s. What I recommend for you Test your omega-3 index. The only way to know for sure if you’re low in omega-3s is via a simple blood test. If you’re getting the essential yearly lab work I recommend , that preventative health checklist includes an omega-3 index. Most Americans are below 4% , which is considered deficient. An omega-3 index of 8% or above is desirable, but I personally like to see patients closer to 12%. Optimize your nutrient intake. EPA and DHA are the most bioavailable forms of omega-3. General health guidelines recommend getting at least 250-500 mg of combined EPA and DHA per day. I recommend going above that and targeting 500-1,000 mg daily though you may need more if your levels are low. Major EPA and DHA sources include: Fatty fish : Salmon, sardines, mackerel, anchovies, trout and herring are all good choices. A single serving of salmon or sardines can easily exceed the daily recommendation of EPA and DHA. I recommend 2-4 servings of fatty fish per week. Shellfish : Oysters, mussels are also great sources of EPA and DHA, though less than fatty fish. Oysters also contain zinc and mussels are a great source of B12. If shellfish are your thing, aim for two servings per week. Algae-based foods : Technically, you can get DHA and EPA from plant-based sources including seaweed, nori, chlorella, and spirulina. But levels are significantly lower than fish sources. If you don’t eat fish, I absolutely recommend an omega-3 supplement. Add a high-quality omega-3 supplement. Adding an omega-3 supplement to your stack can help reduce inflammation, improve blood sugar regulation, protect your heart, and support brain health. I strongly recommend fish oil, as it contains EPA and DHA—the most bioavailable omega-3s. Algae-based omega-3 supplements contain primarily ALA, which is harder for your body to convert, and a small amount ( 100-300 mg )of DHA For optimal omega-3 absorption, Parsley’s Mega Omega 3 has 860 mg of EPA and 580 mg of DHA per serving. I also like the Metagenics OmegaGenics supplement which has 1,000mg of combined EPA and DHA. Become a member at Parsley Health to get a personalized plan for supplementation and lab testing. Use my code RBMDCREW for $150 off your membership. Keep Reading My personal supplement stack. The best diet for brain health? How to Slow Brain Aging Starting in Your 40s Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Brain, bones, booty: 3 things to take care of before you reach menopause. 
URL: https://www.robinberzinmd.com/3-things-to-take-care-of-before-you-reach-menopause/
Updated: 2026-04-03 · Topics: Women’s Health & Hormones
Summary: Your 40’s are a magic decade—the decade that can give you the most leverage when it comes to health span—if you know what to do with it.
Recently a friend came to see me as a patient at Parsley. She had just turned 40, finished breastfeeding her last child, and saw what appeared to be a light at the end of a very long tunnel. The light was the end of her fertility journey. She had spent the past five years consumed with having babies (in her case through IVF)—anything having to do with her own health, aside from fertility, had been sidelined. “What do I do now?” she asked. “Just wait around for menopause?” Robin’s Short Version Your 40s Matter Most: The decade after babies and before perimenopause offers more leverage for long-term health than any other. Risks Stack Quickly: By 50, women face prediabetes, 8% per decade muscle loss, and 1.5 lbs of yearly weight gain — most of it preventable. Test First: A baseline of around 70 biomarkers reveals exactly what to address before layering in any treatments or interventions. Wow, I thought. The answer to that question is a hard no. The period she was describing—post pregnancies, pre-perimenopause—happens to be the same life phase I’m in. And I think it’s one of the most important decades of your health. Over 86% of women in the US will have a baby in her lifetime but for too long we’ve classified women’s health as solely having to do with reproductive health—i.e. the ability to have children (fertility) and the loss of that ability (menopause).Traditional medicine overlooks the years in between, treating them like a reproductive no man’s land. As a result, a lot of women are lost when it comes to their health beyond their reproductive years. It’s a massive missed opportunity. Your 40’s post-babies are a magic decade—the decade that can give you the most leverage when it comes to health span (i.e. looking and feeling your best well into your later years)—if you know what to do with it. After our conversation, I designed a protocol for my friend that I am now recommending to women across my practice who have climbed the fertility hill and see the menopause hill off in the distance. They are often frantically Googling “perimenopause” and swearing to themselves they had a hot flash. We’ll manage the perimenopause symptoms when they arrive, I reassure them, but what matters most for your health—and will determine how you experience menopause—is how you act now. The research says By age 50, not only are most women in or approaching menopause, they are facing increased risk of several types of cancer (including breast cancer , skin cancer , and colorectal cancer ). Women in this age group are also staring down the onset of osteoporosis, worsening rates of anxiety and depression , worse metabolic function ( 45% of Americans over 45 have prediabetes ), and increasing rates of high blood pressure ( particularly after menopause ) and weight gain (starting in perimenopause and increasing by an average of 1.5 pounds each year ). They are also likely depleted energetically and nutritionally (specifically when it comes to Omega-3 fatty acids that support long-term cognitive function) while facing peak life overwhelm as care-takers in the sandwich generation (taking care of kids and elders while also often anchoring the workforce). On top of the above, women in this age group also face the loss of muscle mass (which begins in your 30s and picks up to a rate of about 8% per decade by the time you hit 60)—a major hit to metabolic function, bone strength, and long-term brain health. The good news is, if we start at 40, we can steer away from a lot of these highly preventable conditions, improve our mental health, reduce our biological age (vs. our chronological age), and achieve the world’s mildest menopause. Here’s how. The takeaway I call this the “Brains, Bones, Booty Protocol.” It’s a two-parter. We start with testing and screening to know where we stand and then we add additional interventions to take action. Here’s where to begin. Start with testing. Blood testing. I recommend testing around 70 biomarkers in total. At Parsley, our baseline cardio-metabolic health assessment includes blood sugar markers, an Omega-3 index, ApoB, inflammatory markers like hsCrp, thyroid health, core nutrients (including zinc, vitamin D3, B12, folate and ferritin), blood counts, liver and kidney function, and testosterone levels along with DHEA-S. If you’re menstruating, testing female sex hormones through a DUTCH test can also be helpful. Heavy metal screening. Due to rampant sushi intake and pollution exposure, heavy metals like mercury, which are stored in fat tissue, can be high in women in their 40s. I like to test the body burden of heavy metals and offer a detoxification program for those who need it, given mercury’s impact on the central nervous system . (I also recommend avoiding high mercury fish .) Preventive screenings. Only 8% of people annually get the preventive screenings they should. For my friend, I recommended the following tests: Mammogram DEXA bone density scan Skin cancer check Pap smear and HPV screen Full body MRI (optional) Grail Galleri cancer DNA screening (optional) Cologuard colorectal cancer screening (optional) Note: The last three tests listed here should be a conversation with your doctor, particularly the MRI and Grail. Some patients can handle the information they get from these tests—for others, it’s too much information and they want to stick with the basics. Mental health screening. This patient, like many others at this age, is balancing kids, a career, a partner, and a new awareness of her mortality. For some, the anxiety is crippling and the depression is real. I ask about substance use (which is a dangerous crutch for more people than you might realize) and support systems. Too often the healthy support systems—therapy, religious community, spirituality and spiritual practice—are missing, having been pushed to the wayside for work and family obligations. Take action. For my friend, we’ll use her specific test and screening results to further personalize her action plan, but my core protocol is as follows: Brain Take: Omega 3 fatty acids (2 grams of epa/dha) + 1 tbsp of EVOO daily, as well as a Methylated multivitamin containing Methylcobalamin and methyl B12 (such as Parsley’s Daily Dose Multivitamin ) to support neurotransmitter balance. (For more on what to eat for optimal brain health, read my last newsletter .) Do: A Daily meditation practice for 10-15 minutes. Meditation has been shown to build gray matter in the brain and reduce anxiety. I love the Insight Timer app for guided options. Cultivate: Community engagement. Whether it’s religious, through volunteering, spiritual, or via sports, find something to build social resilience outside of family and work. Bones Take: Bone health supplements like Bone Builder Forte from Metagenics with MCHC, calcium, magnesium, and phosphorous. I also recommend a strontium supplement (600 mg/day) and Vitamin D3 (5000 IU daily). Do: Weight training 3x per week to build bone density. Eat: Bone-building foods, particularly green leafy vegetables and dairy. Booty Do: Strength training 3x weekly to build lean muscle mass, which in turn supports testosterone preservation, and long-term brain function. Adding a weekly Pilates session helps develop core abdominal strength, while weekly yoga helps stimulate hyaluronic acid in the fascia in order to maintain mobility. Eat: 1 gram of protein per pound of body weight daily to build muscle. If you’re looking to work with a medical team who can tailor this protocol to your lab test results and your lifestyle, this is what we do at Parsley Health. Learn more with a free call . Keep Reading Is estrogen the ultimate longevity drug? Your bone density blueprint My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Are seed oils toxic to your health?
URL: https://www.robinberzinmd.com/are-seed-oils-toxic/
Updated: 2026-04-03 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Are seed oils toxic like everyone says? It depends on how you eat them. Here’s everything you need to know.
I recently posted something about my favorite healthy on-the-go snacks and was reminded by my amazing Instagram audience how confusing our modern (highly-processed) food landscape is. Especially when it comes to being able to easily spot what’s actually good for you and what’s not. You asked: Are seed oils toxic? Robin’s Short Version Fix the Ratio: Most people consume 20x more omega-6s than omega-3s; aim for a 3:1 or 1:1 ratio to reduce inflammation and disease risk. Processing Matters: Cold-pressed seed oils retain antioxidants and vitamins, while heat and chemical extraction strips those beneficial nutrients away. Choose Whole Sources: Getting omega-6s from walnuts, sunflower seeds, or pistachios avoids the inflammatory risks tied to refined seed oils. The snack in question was BjornQorn Popcorn. I touted it as being a great source of fiber, but some of you clocked that it’s popped in sunflower or safflower oil. Both are seed oils, which plenty of health influencers, doctors, and scientific studies will tell you are toxic to your health. “I find the topic so confusing,” one of you wrote. “Are there some seed oils to avoid and others that are okay in moderation?” This is such a good question. And it is confusing—seed oils are high in omega-6 fatty acids, which are essential nutrients. So does that mean seed oils aren’t actually that bad? I hear questions like this so often, I figured it was time to do a deep dive. Here’s what you should know about seed oils: The research says Seed oils are made from the seeds of plants. Think: sunflower oil, safflower oil, peanut oil, canola oil, corn oil, soybean oil, and sesame oil. They’re everywhere in our diets, particularly in ultra-processed and packaged foods (which is reason #1 why seed oils can be problematic for your health). Since seed oils tend to have a higher smoke point than healthier EVOO , they’re also often used as cooking oils at restaurants. There are two ways to harvest seed oils, which matters for how nutritious they are: Method 1: Heat and chemical extraction. Can strip oils of their nutrients. Method 2: Cold pressing. Retains more of the oils’ antioxidants and vitamins. As a group, seed oils are high in Omega-6 fatty acids, a type of polyunsaturated fat (or PUFA) that plays an important role in everything from brain function to the regulation of cholesterol . Omega-6s are not inherently bad for you— when consumed the right way ! But seed oils can also be the cause of many ills when consumed in excess. Omega-6s tend to promote inflammation (though there are some exceptions to this) and have been linked to an increased risk of cardiovascular disease and autoimmune diseases like inflammatory bowel disease (IBD) . So, how do we consume omega-6s in a healthy way? One thing we can do is opt for unrefined sources of omega-6s like walnuts, sunflower seeds, and pistachios rather than getting omega-6s in the form of seed oils. But what matters most when it comes to how you consume PUFAs, is the ratio of omega-6 to omega-3s. Most people are consuming too many omega-6s in the form of seed oils; in the modern food ecosystem, the average person consumes something like 20x more omega-6s than omega-3s . This is a yikes. Ideally, you should be consuming a 3:1 (or even better 1:1) ratio of omega-6 to omega-3s to lower your risk of inflammation and disease. Research shows this ratio is associated with a lower risk of cardiovascular disease, colorectal cancer and improved outcomes for rheumatoid arthritis and asthma. What I’m doing for my own body Unfortunately, refined seed oils are all but impossible to avoid in our modern food landscape. I focus less on trying to cut them out entirely, and more on choosing high-quality cold pressed seed oils when possible. And, more importantly, balancing my ratio of omega-6s to omega-3s. This way I’m not stressed when I eat a meal out (even though I know it was probably cooked in a low-quality refined oil) or have the occasional packaged snack like BjornQorn when I’m on-the-go. I eat to boost my omega-3s Increasing my omega-3 intake is key for maintaining a low ratio. I go for a daily tablespoon of EVOO (I’ll literally drink it) plus: Walnuts (2.5g per serving) Fatty fish like salmon (4g per serving) Chia seeds (4.9g per serving) Sardines if you’re into them (2.2g per serving) I cook most of my meals The biggest ways we are exposed to seed oils are in packaged foods and restaurant foods. I cook most of my meals at home and opt for fresh snacks like fruit or veggie sticks most of the time. When I’m cooking, I use high-quality EVOO or avocado oil when possible. When that doesn’t work for a recipe, I opt for a cold pressed organic seed oil high in oleic acid (omega-9s) . I like Ulli’s Oil Mill and Fresh Press Farms . What I recommend for you At Parsley, we can test your ratio of omega-6 to omega-3 intake . That’s a good place to start. Otherwise, I recommend the following. Avoid ultra-processed foods at all costs. I cannot say this enough. When you do need to reach for a packaged snack (Something not even I am immune to!) look for better-for-you options like the BjornQorn I recommended a few weeks ago. The relatively low amount of non-GMO seed oil it contains is way less concerning than the refined carbs and oil you’d get ingesting chips to satisfy a salt craving. Opt for cold pressed cooking oils at home. I’m betting the big jug of canola oil you keep in the pantry for frying and baking isn’t cold pressed. (Cold pressed canola oil does exist, but it’s wildly hard to find!) High-quality coconut oil, avocado oil, and EVOO are all excellent swaps. If you can’t get around using a seed oil (maybe you’re doing stir fry and want that sesame taste) opt for a cold pressed version. The bottom line: It would be next to impossible to eliminate seed oils from your diet entirely—and honestly you don’t need to. When eaten in a 3:1 (or lower) ratio with foods rich in omega-3s, cold pressed seed oils can be a healthy source of omega-6s. Want to test your omega-6 to omega-3 ratio and come up with a personalized plan to lower it? Come talk to one of our experts at Parsley . Use my personal code RBMDCREW for $100 off your membership. Keep Reading My personal microplastics protocol Can processed & deli meats be healthy? Are plant-based meats just ultraprocessed food in disguise? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Perimenopause Symptoms: What the Research Shows
URL: https://www.robinberzinmd.com/perimenopause-symptoms-research/
Updated: 2026-04-03 · Topics: Women’s Health & Hormones
Summary: I’ve been dealing with hormonal acne at 45. Here’s what I’ve learned treating perimenopause for a decade — and what the 2025 research changes.
I’ve been dealing with hormonal acne lately. At 45. Robin’s Short Version A landmark study analyzed 5,500+ women aged 40–69 and found that hot flashes and vaginal dryness can emerge well before cycles become irregular — a regular period does not rule out perimenopause. More than half of women ages 30–35 were already experiencing moderate to severe perimenopausal symptoms — but most didn’t seek treatment until decades later. Perimenopause can last anywhere from five years to fifteen years — the earlier you catch it, the more options you have. I hadn’t had it in years. Then stress hit differently — and suddenly I’m breaking out along my jaw like I’m in my twenties again. Only this time, it’s not just stress. It’s stress interacting with hormones that are quietly shifting. That’s perimenopause. Not a dramatic announcement. Not a missed period. Just… things feel a little off, and you can’t quite explain why. I’ve been treating women in perimenopause for over a decade. And the social media conversation, while well-intentioned, leaves a lot of women confused — every symptom blamed on hormones, every solution pointing to HRT. The reality is more nuanced. And knowing the difference could change how you treat what you’re feeling — for the better. 🤓 What to know: Your period is the last thing to change — not the first. ❌ The old assumption: Perimenopause starts when your cycle gets irregular. That’s what the standard diagnostic playbook (called STRAW+10) has historically said. But new research is reshaping this. ✅ The new reality: Symptoms often arrive before cycle changes. A landmark study in The Lancet Diabetes & Endocrinology , 2025 [1] analyzed 5,500+ women aged 40–69 and found that hot flashes and vaginal dryness can emerge well before cycles become irregular. A regular period does not rule out perimenopause. And it starts earlier than most women realize. Research in npj Women’s Health , 2025 [2] found more than half of women ages 30–35 were already experiencing moderate to severe symptoms — but most didn’t seek treatment until decades later. 💥 Perimenopause can last anywhere from five years to fifteen years. The earlier you catch it, the more options you have. One hormone test won’t tell you much. Estrogen and FSH fluctuate wildly during perimenopause — sometimes day to day. A single blood draw is a snapshot of one moment, not a trend. What matters is testing trends initially over 3–6 months — and then every 6 months thereafter. This gives you a way to connect the dots with your symptoms as hormones are in motion. It might not be perimenopause at all. Or not only perimenopause. This is where most media coverage gets it wrong. Brain fog. Abdominal weight gain. Sleep disruption. Mood shifts. Acne. These are real perimenopause symptoms. They’re also symptoms of: thyroid dysfunction adrenal dysregulation blood sugar instability gut microbiome imbalance nutrient deficiencies (iron, B12, vitamin D) The overlap between perimenopause and thyroid dysfunction is especially striking — both cause menstrual irregularities, mood changes, sleep disruption, and fatigue. As the European Menopause and Andropause Society [3] has noted, the differential diagnosis is genuinely difficult. If you assume it’s always a hormone problem, you often miss something important. 💪 What to do: Assess the whole picture — then treat what’s actually there. Step 1: Know which symptoms point most clearly to perimenopause Not all symptoms are created equal. More specific to perimenopause: Hot flashes and night sweats Vaginal dryness Cycle changes (heavier, lighter, shorter, skipped) New joint aches that track with your cycle Less specific — could be perimenopause OR something else: Fatigue, brain fog, weight gain, mood changes, poor sleep, hair thinning, skin issues If you have symptoms from the second list but not the first, start with a broader workup before assuming hormones. Step 2: Get the right labs — and watch for trends Ask for: Estradiol + FSH + progesterone (timed to cycle day 21 if you’re still cycling) Total and free testosterone TSH + free T4 + free T3 (not just TSH — you want the full thyroid picture) Fasting insulin + fasting glucose Ferritin, B12, vitamin D ApoB triglycerides and Lpa DUTCH test for hormone metabolism pathways and adrenal function One panel is a starting point. Two or three every 3–6 months is what tells the story. If you want to go deeper on which labs actually matter for women, I cover the full picture in my essential labs post . Step 3: Optimize foundations before reaching for hormones A lot of perimenopausal symptoms respond significantly to diet exercise stress reduction and supplements — not because the hormonal shift isn’t real, but because these fundamentals directly influence how your body handles that shift. 🛌 Sleep: Aim for a consistent wake time, 7 days a week — even on weekends. This single habit does more to regulate your cortisol rhythm (and downstream hormones) than most supplements. If night sweats are disrupting sleep, this is worth treating directly — topical progesterone or low-dose HRT can help. 🥩 Protein: Aim for 25–35g of protein per meal, especially breakfast. This stabilizes blood sugar, which is often swinging in perimenopause and amplifying symptoms like mood crashes and fatigue. Eggs, Greek yogurt, smoked salmon, or a quality protein shake all work. 🦠 Gut health: Take a daily probiotic with Lactobacillus strains. Your gut microbiome directly influences estrogen metabolism — a disrupted microbiome can worsen hormonal symptoms independent of what your ovaries are doing. I take Parsley Health’s daily probiotic and alternate it with Seed’s. 🔥 Inflammation: Cut alcohol first — even moderate intake amplifies hormonal swings and disrupts sleep architecture. Then look at ultra-processed foods and added sugar as the next lever. These are the highest-ROI dietary changes for perimenopausal symptoms. Step 4: Consider targeted supplements — and hormones when indicated Supplements worth trying: Vitex (chasteberry): A randomized double-blind trial [4] found Vitex significantly reduced total menopausal symptoms, anxiety, and hot flashes vs. placebo at 8 weeks. Best for irregular cycles and mild-moderate symptoms. Give it 8–12 weeks. DIM (diindolylmethane): Supports healthy estrogen metabolism — particularly useful when estrogen is higher relative to progesterone. Magnesium glycinate: 200–400mg before bed. Supports sleep, cortisol regulation, and mood. When hormones are the answer: There are excellent options depending on your picture — low-dose progesterone (oral, topical, or vaginal), low-dose estrogen (patch, gel, or cream), testosterone. This should be personalized based on your symptoms, labs, and history. If you’re wondering whether estrogen is right for you , I go deep on the evidence in that post. The goal: you’re not white-knuckling through the transition. You’re assessing the full picture and treating what’s actually driving your symptoms. Does this resonate — the feeling that something is shifting but you can’t quite name it yet? Hit reply. 💛 The Momgevity Files I’m a doer. When there’s a problem, I fly into action. I help, I fix, I solve, I overfunction, I close the gaps. Sound familiar? It’s probably part of why longevity resonates so much with me. I love putting science into action when it comes to how I look and feel — and the sense of control I get from being proactive is almost… addictive. At the same time, I keep balance by giving myself permission. Sometimes it’s pizza day, or a glass of natural wine. Sometimes I’m not going to bed at 10:30pm — it’s going to be midnight because I’m out living my life, and I wouldn’t trade that for anything. Occasionally I have a day where I just don’t bother with supplements. Not sure what that one’s about, but since it only happens once a month or so — great. But even balance can become a finely calculated pursuit. A way of optimizing in and of itself. In my case, my greatest work right now is actually to do less. I have a personal formula I’m working with to accomplish that: Presence. Acceptance. Surrender. Ask for help. (I call it my PASA process 😊) When I find myself stressed, frustrated at how a situation is going, or feeling the need to micromanage or dive in and fix something, I start by being present with it — sitting with it, observing, watching. What is it telling me? Why did I create it? What decisions did I make in the past that contributed to it? Second, I practice accepting it. It is what it is. I don’t have to be at war with what’s in front of me — even just for a few minutes, even as the resistance washes through. I remember that resentment is like drinking poison and hoping someone else dies, and that expecting everyone and everything to follow my directions — like actors in a play I’m directing — is unrealistic. Third, I practice surrender . This means abandoning the idea that I’m going to DO anything about this right now — a business issue, a disagreement with a friend or my husband, a situation with my kid. I imagine what it would look like to take no action whatsoever. Finally, I ask for help . For me, that means asking God — non-denominational in my case — to help resolve the issue, guide me, or give me clarity. I don’t give up, because “giving up” implies exasperated defeat and the resistance is still in place. I let go and hand the situation over. This is not a natural exercise for me. It’s a practice. I share it because health is a practice — and we are all living our way to better health every day. My own health practice isn’t just physical. It’s mind, body, and spirit. We can lift all the weights, take all the supplements, and hit the perfect body composition — but if we’re at war with ourselves, or burning ourselves out, I don’t think we’re actually healthy. For me right now, optimal health means shifting into a paradigm of mental and emotional freedom through my PASA process. I hope you give it a try. I’m finding it makes life way easier — and that feeling might give me more longevity than anything else. ⚡️ One more thing… If any of this resonates — the symptoms, the confusion, the feeling that something is shifting but you’re not sure what — this is exactly what we do at Parsley. If you’re experiencing hot flashes or night sweats alongside brain fog and mood changes — and you’re not sure whether you’re looking at a hormone problem, a thyroid problem, or both — we can run estradiol, progesterone, free T3, and a DUTCH test together, and build you a personalized plan that treats what’s actually driving your symptoms. Talk to a Parsley provider → Stay strong, stay curious, remember to breathe, Robin Frequently Asked Questions Can perimenopause start in your 30s? Yes — and this surprised even me when I first saw the data. Research in npj Women’s Health (2025) found more than half of women ages 30–35 were already experiencing moderate to severe perimenopausal symptoms. Most didn’t seek treatment until decades later, which means a lot of women are suffering unnecessarily. Does a regular period mean I’m not in perimenopause? No — and this is one of the most important things I want women to understand. A landmark 2025 Lancet study of 5,500+ women found that hot flashes and vaginal dryness can emerge well before cycles become irregular. A regular period does not rule out perimenopause. What labs should I ask for to check for perimenopause? I recommend a comprehensive panel: estradiol, FSH, progesterone (timed to cycle day 21 if you’re still cycling), total and free testosterone, TSH with free T4 and free T3, fasting insulin and glucose, ferritin, B12, vitamin D, ApoB, and a DUTCH test for hormone metabolism and adrenal function. One draw is a starting point — testing every 3–6 months is what actually tells the story. What supplements help with perimenopause symptoms? Three I recommend starting with: Vitex (chasteberry), which a randomized double-blind trial found significantly reduces hot flashes and anxiety vs. placebo at 8 weeks; DIM (diindolylmethane) to support healthy estrogen metabolism; and magnesium glycinate at 200–400mg before bed for sleep, cortisol regulation, and mood. Give each at least 8–12 weeks before evaluating. Scientific References The Lancet Diabetes & Endocrinology, 2025 — Hot flashes precede cycle irregularity in 5,500+ women npj Women’s Health, 2025 — Over half of women 30–35 report moderate-to-severe perimenopausal symptoms European Menopause and Andropause Society — Perimenopause and thyroid dysfunction differential diagnosis PMC 2019 — Vitex reduces menopausal symptoms, anxiety, and hot flashes vs. placebo Keep Reading Fertility Over 35: 8 Evidence-Backed Levers Brain, bones, booty: 3 things to take care of before you reach menopause. My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Plasmapheresis for Longevity: What the Research Shows
URL: https://www.robinberzinmd.com/plasmapheresis-longevity-research/
Updated: 2026-03-14 · Topics: Longevity & Metabolic Health
Summary: My patients keep asking about plasmapheresis. Two 2025 studies finally gave me something real to work with — and the picture is more complicated than the $10,000 price tag suggests.
My patients have been asking me about plasmapheresis for years. I’ve watched colleagues offer it at longevity clinics — including at Extension Health in New York, where Parsley has a partnership. I’ve been curious. I’ve also been skeptical. Robin’s Short Version One 2025 study confirmed this directly: after removing certain toxins from plasma, they rapidly flooded back from fat stores — with a rebound ratio of nearly 2x for some compounds. A 2025 Buck Institute RCT showed TPE reduced biological age by up to 2.61 years — but only when plasma was replaced with albumin. The biggest benefits in the Buck trial went to people with the highest baseline inflammation. If your sleep, nutrition, exercise, and hormones are already dialed in, the marginal return may be pretty low. For a long time, I didn’t know what to tell people. Not because I hadn’t looked. Because the data wasn’t there. No solid before-and-after testing. No proof it moved the needle on symptoms or longevity markers. Just a very expensive, time-consuming procedure and a lot of hope. Then Gwyneth Paltrow shared her experience publicly, my inbox filled up again — and two major studies dropped in 2025 that finally gave me something real to work with. The picture got more interesting. And more complicated. 🤓 What to know: Blood isn’t where most toxins live. ❌ The assumption: Plasmapheresis "cleans" your blood of heavy metals and environmental toxins — and that’s why people are doing it. ✅ The problem with that assumption: Most toxins we worry most about — mercury, lead, pollutants — are stored in fat tissue, bone, and brain. Not circulating plasma. Blood is a transit system, not a storage depot. One 2025 study [1] confirmed this directly: after removing certain toxins from plasma, they rapidly flooded back from fat stores — with a rebound ratio of nearly 2x for some compounds. You can filter the river, but if the source is upstream, it fills right back up. ✅ What TPE actually does: As we age, plasma accumulates something called "SASP factors" — these pro-inflammatory proteins from dying cells that actively suppress tissue repair. Replacing that plasma with albumin (an antioxidant and immunomodulator) resets the environment. Research from the Conboy lab at UC Berkeley showed TPE restored youthful balance across the key inflammatory signaling pathways. [2] A 2025 Buck Institute RCT [3] showed TPE reduced biological age by up to 2.61 years — but only when plasma was replaced with albumin. A separate 2025 study [4] found that removing plasma without albumin replacement may actually accelerate epigenetic aging. What goes back in matters as much as what comes out. ⚠️ The caveats: The Buck trial had only 44 participants and was funded by Circulate Health, a company with commercial interest in TPE. No long-term clinical outcomes data yet. We don’t know if biological age reduction on epigenetic clocks translates to fewer diseases or longer life. At $10,000–$15,000 per session, that’s a meaningful gap. The biggest benefits in the Buck trial went to people with the highest baseline inflammation. If your sleep, nutrition, exercise, and hormones are already dialed in , the marginal return may be pretty low. TPE is not a shortcut. 💪 What to do: Ask these questions before spending anything. Step 1: Know what you’re actually trying to detox. If your concern is heavy metals or toxin burden, ask your doctor to run a heavy metals panel first. TPE is probably not the most direct intervention — chelation therapy (oral or IV) and reducing ongoing exposure address that problem at the source. Step 2: Demand albumin replacement. Not all plasmapheresis protocols are the same. The studies showing biological age reduction all used albumin replacement. The study showing potential harm used none. This is the single most important question to ask any clinic. ⭐ If you do one thing: Demand albumin replacement — the studies showing biological age reduction all used it, and the study showing potential harm used none. Step 3: Measure before and after. If you’re going to spend this kind of money, measure it. Get epigenetic age testing (TruAge or Tally Health) before your first session and again 6–8 weeks after. Data, not vibes. Step 4: Fix foundations first. The biggest benefits in the Buck trial went to people with the highest baseline inflammation . If your sleep, nutrition, exercise, and hormones are already dialed in, the marginal return may be pretty low. TPE is not a shortcut. The goal: If you pursue TPE, go in with clear expectations — not detox fantasies. The real promise is inflammation reset. That’s worth studying. It may even be worth doing. But only with the right protocol and measurable outcomes. 💛 The Momgevity Files This week I’ve been reflecting on a concept called: the Myth of the Linear Path. A close friend of mine is a Yale professor who teaches workshops on how to be good at life — navigating transitions, fighting well with people you love, the art of listening. (Check out Life Shop if you’re curious — I highly recommend it.) I’ve been creating more educational content lately (I taught a live workshop on fertility optimization last week, my first in a while), so I sat in on her life transitions class to see what I could learn. The message that landed hardest was something I tell friends, patients, and loved ones all the time — but TBH keep forgetting myself: progress is not linear. It’s showing up everywhere for me right now. I got into weight training, but I keep giving myself sacroiliitis — low back pain at the sacroiliac joint — by moving too fast, so I’m having to slow down and focus on alignment. I started using topical estrogen on my face to prevent skin aging and promptly got acne again, a sign my body isn’t quite ready for even a light dose, at 44. I thought we were settled in our home for a while; it now looks like we may have to move this summer, through forces outside our control. Some of the new directions we’re taking at Parsley are working better than expected. Others need a rethink. We tend to assume that by midlife, everything should be up and to the right. But there’s no such thing as a linear path. What midlife actually offers — if we let it — is enough self-knowledge to weather the backtracks, side quests, and unwelcome plateaus with more grace. Longevity requires resilience. Resilience requires perspective. The perspective I’m leaning into: linearity is a myth, but the journey usually brings me somewhere good — even when the path is surprising. Which is giving me the motivation to train slower, hold off on the estrogen, and trust the process. Have you been tempted by a high-ticket longevity treatment — and either did it or talked yourself out of it? Hit reply. ⚡ One more thing… Bone health is on my mind right now — personally and clinically. I just published a reel busting the biggest myths about calcium and bone protection. Go watch it here. One thing I’ve added to my own protocol: AlgaeCal Plus — a plant-based calcium that’s clinically shown to support increases in bone density . If your DEXA scan showed early bone loss — or you’re in perimenopause and haven’t checked yet — come talk to us. We’d run estradiol, DHEA-S, and a bone resorption marker panel (NTX or CTX) to understand what’s actually driving your loss, then build a protocol around the interventions that move bone density: hormones, resistance training, and targeted supplementation, not just calcium. Talk to a Parsley provider → Stay strong, stay curious, and breathe, Robin Join Parsley using RBMDCREW to save $100 on your membership. Frequently Asked Questions Does plasmapheresis actually remove toxins like heavy metals? The assumption that plasmapheresis "cleans" your blood of heavy metals is the core problem — most toxins we worry about are stored in fat tissue, bone, and brain, not circulating plasma. A 2025 study confirmed that after removing certain toxins from plasma, they rapidly flooded back from fat stores with a rebound ratio of nearly 2x for some compounds. Blood is a transit system, not a storage depot. How much can plasmapheresis reduce biological age? A 2025 Buck Institute RCT showed therapeutic plasma exchange reduced biological age by up to 2.61 years — but only when plasma was replaced with albumin. The trial had only 44 participants and was funded by Circulate Health, a company with commercial interest in TPE, so I’m holding the finding with appropriate skepticism while watching for replication. What is the difference between plasmapheresis with and without albumin replacement? This is the single most important question to ask any clinic. The studies showing biological age reduction all used albumin replacement — albumin is an antioxidant and immunomodulator that resets the inflammatory environment. A separate 2025 study found that removing plasma without albumin replacement may actually accelerate epigenetic aging. Not all plasmapheresis protocols are the same. Who is plasmapheresis actually worth it for? The biggest benefits in the Buck trial went to people with the highest baseline inflammation. If your sleep, nutrition, exercise, and hormones are already dialed in, the marginal return may be pretty low — TPE is not a shortcut. At $10,000–$15,000 per session and no long-term clinical outcomes data yet, I’d fix foundations first and measure before and after with epigenetic age testing if you do proceed. Scientific References Journal of Clinical Apheresis, 2025 — Toxin rebound from fat stores after plasma removal GeroScience, 2022 — TPE restored youthful inflammatory signaling balance Aging Cell, 2025 — Buck Institute RCT: TPE reduced biological age by 2.61 years Scientific Reports, 2025 — Plasma removal without albumin may accelerate epigenetic aging Keep Reading Chronological vs. Biological Age: Which One Really Matters? How to slow your aging velocity My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## 4 fasting for women strategies to optimize longevity
URL: https://www.robinberzinmd.com/fasting-for-women/
Updated: 2026-03-13 · Topics: Women’s Health & Hormones
Summary: The internet loves to argue: “Is fasting bad for women’s hormones?” But that’s the wrong question. We should ask: what type of fasting for women?
Plus, estrogen for longevity and cod bars. Robin’s Short Version The 16-Hour Threshold: Fasting past 16 hours switches on autophagy, clearing Alzheimer’s-linked proteins and eliminating precancerous cells. Break Fast Right: Ending your fast with 30g of high-quality protein hits the leucine threshold needed to trigger muscle protein synthesis and prevent muscle loss. Annual Deep Reset: A once-yearly 5-day fast drives deeper autophagy than daily fasting and can regenerate both immune and gut stem cells. Fasting for women is a powerful longevity tool—if you get the strategy right. Last month I wrapped up my annual 5-day fast (this year, a fasting-mimicking diet—more on that below). Not for weight loss. Not to “detox.” But because fasting done right can be one of the most effective ways to: Induce cellular repair Reset metabolic health Lower inflammation Rebalance hormones Reduce chronic disease risk Fasting is also one of the most misunderstood tools for women. The internet loves to argue: “Is fasting bad for women’s hormones?” But that’s the wrong question. The right one is: What kind of fasting, for which woman, and when? Let’s break it down. 🤓 What to know: Fasting triggers the magic of autophagy. For weight loss, fasting is less studied than calorie restriction. But for longevity , we know that fasting for 16+ hours can switch on autophagy —your body’s cellular recycling program ( International Journal of Molecular Sciences , 2025). Autophagy clears damaged components inside cells, removes “junk” proteins, and stimulates repair. Think of it as a deep clean at the microscopic level. The benefits are wide-reaching: 🧠 Brain Health Clears misfolded proteins like beta-amyloid and tau (linked to Alzheimer’s) Boosts BDNF, a compound that supports memory and mood 🎗 Potential Cancer Prevention Eliminates precancerous cells Lowers IGF-1 (a growth signal linked to cancer) Reduces oxidative stress + inflammation Enhances DNA repair 🔥 Lower Inflammation Removes damaged mitochondria that create inflammatory free radicals Downregulates pro-inflammatory pathways like NF-kB ❤️ Cardiovascular Health Improves lipid metabolism Enhances HDL/LDL ratios Reduces vascular inflammation 💪 Metabolic Health Improves insulin sensitivity Stabilizes blood sugar Reduces liver fat accumulation 🌱 Stem Cell Activation Prolonged fasts (48–72 hrs) regenerate immune + gut stem cells ⚠️ Why Women Need a Different Fasting Strategy Women have tighter hormonal feedback loops and store more body fat than men. That means aggressive fasting can cause: Muscle loss Blood sugar crashes Hormone disruption Your baseline matters. If you’re already metabolically fit, too much fasting can backfire. But many women (myself included) sit at a desk most of the day and aren’t burning through glycogen regularly. For women with impaired glucose control, PCOS, menopause symptoms, or metabolic syndrome, fasting can help reset hormonal imbalances and restore metabolic health ( Disease Markers , 2022). 💪 What to do: Start with a 16+ hour intermittent fast followed by 30g of protein. Fasting isn’t “bad” for women. But fasting without a strategy can be. My personal protocol: 16-hour intermittent fast (7 PM–11 AM) 3–4 days/week → burns glycogen, shifts my body into fat-burning mode, gentle enough that I don’t get hangry Break fast with 30g protein → enough to trigger muscle protein synthesis, which is most effective when you hit a threshold of leucine (~25–35g of high-quality protein) 1x/year 5-day fasting sprint → deeper autophagy, immune reset, inflammation reduction (especially important for my positive ANA marker, a marker of autoimmune activity) 4 fasting styles to explore: 🕜 Intermittent Fasting (aka time-restricted eating) Easy entry point, helpful for blood sugar regulation and mild caloric control. 12-15 hours: fat burning begins and insulin sensitivity improves. 16+ hours: autophagy begins. Try a 7pm to 11am fast 3x per week. 🥩 Ketogenic Diet High-fat, very low-carb diet—70-80% calories from fat, 10-20% protein, and 5-10% carbs—shifts the body into ketosis (i.e. burning fat instead of glucose for fuel). Works best when paired with blood (most accurate) or urine testing (least accurate) to confirm your body is in ketosis. Can worsen high cholesterol in some people. One small case study found that a ketogenic diet significantly improved symptoms in patients with major depressive disorder ( Frontiers in Nutrition , 2024) Talk to your doctor about your cardio labs before trying. 🚰 Nothing-But-Water Fast 4-12 hours: blood sugar and insulin drop 12-16 hours: ketosis starts 16-24 hours: autophagy begins, inflammation lowers, fat metabolism and growth hormone rises 24-36 hours: autophagy intensifies and cognitive and immune function may improve 48-72 hours: stem cell renewal in the gut, blood, and immune system I don’t recommend more than 5 days of fasting at a time. 🥗 Prolon (fasting-mimicking diet): This year I tried Prolon’s 5-Day Fasting Mimicking Program , a pre-packaged meal kit designed to induce ketosis and autophagy while you’re still eating. Designed by researchers at the University of Southern California to induce a state of “cellular fasting.” Allows you to eat pre-packaged food without activating nutrient sensing pathways (IGF-1, mTOR, and PKA). Proven to reduce body fat, improve blood pressure, and lower IGF-1 ( Science , 2017). Super convenient. Great for first-timers or those who can’t tolerate water fasting. 🚫 When to avoid fasting Burnout/adrenal dysregulation → Fasting activates stress pathways (AMPK and cortisol), which can worsen symptoms of hypothyroidism and adrenal dysregulation. Trying to conceive → can lower LH and estradiol, disrupting ovulation or causing missed periods (Note: this assumes you’re already metabolically healthy. Poor blood sugar control, metabolic syndrome and diabetes can all worsen fertility and conditions like PCOS. If intermittent fasting improves your blood sugar control, it may potentially help fertility.) Pregnant or breastfeeding → higher calorie needs; may affect milk supply or fetal development Perimenopause/menopause → research is mixed; may be especially effective for weight loss in post-menopausal women ( Nutrition and Healthy Aging , 2017), but could cause a drop in estrogen precursor DHEA ( Obesity , 2022). (My POV: even if a short-term fast temporarily disrupts hormones, a 5-day fast once a year to improve autophagy and reduce inflammation is unlikely to have a long-term effect on hormone levels.) Low muscle mass (<27%) or BMI (<18.6) → higher risk of muscle loss unless paired with adequate protein and resistance training On GLP-1s → risk of dangerously low blood sugar and GI distress History of disordered eating → even structured fasting can reinforce harmful food patterns ⚡ Quick Hits 🎧 Estrogen is the new longevity drug I joined the Global Wellness Institute podcast to talk biomarkers, GLP-1s, and why estrogen matters more than ever. Listen here ! 🥦 Real food = double the weight loss If you needed more proof UPFs are bad for you, a new study found people who cut ultra-processed foods lost 2x more weight. Whole foods increase satiety and reduce overall calorie consumption while improving body composition. My favorite recipes for addictive veggies. 🐟 Cod bars? David (of protein bar fame) is now selling vacuum-sealed wild cod fillets. Not sure how my stomach feels about this, but it’s at least a real-food upgrade from their “frankenbars. I still prefer Epic meat bars on-the-go. 💛 The Momgevity Files This week, I pulled a tick off my leg and prescribed myself a single 200mg dose of doxycycline to prevent Lyme disease. I’ve lived in Lyme-heavy zones, treated patients with it, and seen how disruptive it can be—so I take it seriously. I was upstate with some mama friends, where Lyme anxiety is running high. One won’t even let her kids walk in the grass. I get it… but I’m not spending the summer indoors. I’ll sit in the grass and let my kid run barefoot—then we do a tick check every. single. time. This week, both my three-year-old and I ended up with bites. Here’s what the CDC says: if a deer tick has been attached long enough, a single 200mg dose of doxycycline within 72 hours can lower Lyme risk by 87%. For my son (45 lbs of giant toddler—thanks, bone broth + Parsley protein powder) that meant a one-time 100mg dose. Yes, kids can take doxy as prevention, but it’s weight-based—so talk to your pediatrician. My take: If you get a tick bite, take the antibiotics and move on. Herbal antimicrobials can be amazing for chronic Lyme, but for acute prevention, doxy is fast, effective, and low-risk. In the wellness world, it’s easy to slide into “anti-medication” mode. But I’m a both/and girl: Eat real food Avoid toxins Move daily And yes—use pharmaceuticals when they’re the best tool for the job You can be anti-inflammatory and pro-antibiotic when the moment calls for it. Stay strong, stay curious, and breathe, Robin Keep Reading Metabolic flexibility: The secret engine behind energy, fat loss, and longevity. What a CGM Can Tell You About Your Aging Velocity How Much Protein Should You Really Be Eating? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## ADHD in Women: How Hormones Affect Focus and Diagnosis
URL: https://www.robinberzinmd.com/adhd-women-hormones-perimenopause-diagnosis/
Updated: 2026-03-06 · Topics: Women’s Health & Hormones
Summary: I co-authored ADHD research in my 20s and had no idea I had it myself. Here’s what perimenopause, estrogen, and dopamine have to do with your focus.
My first job in healthcare was at NYU School of Medicine, where I worked on ADHD research in my early 20s. I co-authored a peer-reviewed chapter on diagnosing ADHD in adults. I sat in on fMRI studies. I managed pharmaceutical trials. And I had absolutely no idea I had ADHD. I was always focused, high-achieving, and a great student starting in middle school (when my hormones turned on!) Nothing about what we studied looked like me. My mental model of ADHD was a hyperactive boy who couldn’t sit still — not a driven, creative, sometimes-scattered woman who hyperfocuses on what she loves and forgets the rest. Robin’s Short Version 43% of women get their first ADHD diagnosis between ages 41–50 — that’s not a coincidence. That’s estrogen. Estrogen boosts dopamine production, improves receptor sensitivity, and slows dopamine breakdown. 54% of women with ADHD experience debilitating perimenopausal symptoms — vs. one-third of women without ADHD. And their perimenopause starts up to 10 years earlier. Then one of my kids was diagnosed. And everything shifted. Going through that journey with my son, I started recognizing patterns I’d never connected before — in him, then in myself. The hyperfocus. The creativity I’ve always considered a strength. The genuine difficulty staying present in conversations that don’t fully capture my attention. The entrepreneurial drive that, I now understand, comes from the same wiring. I also looked back to childhood and remembered things that were written off at the time. The constant fidgeting and playing with my hair. Being far behind in reading in first grade – something that was chalked up at the time to a “motor delay.” Struggling as a student in lower school – then shooting to the top of my class in middle school when my hormones turned on. As an adult, ADHD is one of my superpowers. It’s also one of the most misunderstood conditions in women’s medicine. Millions of women my age are getting diagnosed for the first time and asking the same question I did: How did no one catch this? This week, I’m diving in. 🤓 What to know: ADHD in women was systematically missed — and perimenopause is the great unmasker. ❌ The old assumption: ADHD is a childhood disorder in boys. Scattered, overwhelmed women have depression or anxiety. Between 2007 and 2016, ADHD diagnoses in adult women rose 344% — vs. 264% in men [1] . That’s not overdiagnosis. That’s a correction. The diagnostic criteria were built on boys: hyperactivity, acting out, disruption. Girls present differently — inattentive, internal, emotionally dysregulated. Girls also mask . They learn to sit still, overachieve, compensate. By adulthood, many have been diagnosed with anxiety or depression first. The underlying ADHD goes untreated for decades. ✅ The new reality: Estrogen is your brain’s dopamine stabilizer. Perimenopause pulls it out from under you. ADHD is fundamentally a dopamine regulation problem. Estrogen boosts dopamine production, improves receptor sensitivity, and slows dopamine breakdown. High estrogen = better focus, working memory, emotional control. When estrogen crashes and swings wildly — as it does in perimenopause — dopamine becomes unstable. For women with existing ADHD, this is a double-whammy. For women who masked their whole lives, perimenopause removes the hormonal buffer that was quietly holding things together [2] . 43% of women get their first ADHD diagnosis between ages 41–50 [3] . That’s not a coincidence. That’s estrogen. 🧠 But is it really ADHD — or just menopause brain? Both can be true. And it matters which is driving things — because the treatment differs. True ADHD starts in childhood. The symptoms may have been subtle or well-masked, but they were there. Some women only see it in retrospect, especially after a child’s diagnosis. Others have purely hormonal brain fog that mimics ADHD without the underlying condition. A good clinician helps you tell them apart. Women with pre-existing ADHD worsened by hormones often need both HRT and ADHD treatment . Women with hormonal brain fog alone usually respond to HRT without ADHD meds. 54% of women with ADHD experience debilitating perimenopausal symptoms — vs. one-third of women without ADHD. And their perimenopause starts up to 10 years earlier [4] (N=5,392). If you have ADHD, menopause hits harder and sooner. 💪 What to do: Treat the whole picture — mind and body. Step 1: Start with your hormones. If you’re 38–55 with new brain fog, focus problems, or emotional dysregulation — get a hormone panel and assess for symptoms for estrogen decline (dry skin, vaginal dryness, irregular cycles.) If estrogen is declining, the patch or gel is often the fastest path to clarity. Many women see real cognitive improvement within 4–8 weeks. Step 2: Get a proper ADHD evaluation if symptoms don’t resolve. A real evaluation includes childhood history (symptoms need to trace back before age 12, even subtly), current symptom review, and ruling out other causes — thyroid, sleep issues, mood disorders. Online checklists are a starting point, not a diagnosis. If ADHD is confirmed, medication and HRT often work better together — estrogen makes stimulants more effective. Step 3: Cardio hits fast, Yoga rewires over time. Cardio 20–30 minutes at 65–85% max heart rate, 3–5x per week. The dopamine spike after cardio mirrors what stimulant medication does chemically — immediate reductions in inattention and impulsivity [5] . Layer in yoga 2–3x per week. A meta-analysis of 19 RCTs found yoga improved working memory, impulse control, and cognitive flexibility with medium effect sizes [6] . Step 4: Nail your sleep timing. 60% of adults with ADHD have sleep problems — and perimenopause makes it worse. The key is timing, not just duration: same bedtime and wake time within 30 minutes every day. Even one or two nights of irregular sleep degrades attention and impulse control. If you want to go deeper on sleep consistency as a longevity lever , I’ve written about it extensively. Step 5: Add two supplements. Fish oil: 1–2g daily, 4:1 EPA to DHA ratio. Consistent modest improvements in inattention across multiple trials [7] . Magnesium glycinate: 200–400mg at night. Adults with ADHD test lower in magnesium. Improves hyperactivity and the late-day crash when stimulant medication wears off — and doubles as sleep support. Step 6: Cut out alcohol. It disrupts dopamine and makes both ADHD and menopausal brain fog significantly worse. This one matters more than most people want to admit. For me, a low-inflammatory diet, regular yoga and cardio, daily meditation, and consistent supplementation have made me far more focused and calm — without touching my fast pace or my drive. The goal isn’t to flatten the ADHD. It’s to work with your brain, not against it. 💛 The Momgevity Files The past three years have felt like living in a slow-moving crisis as we’ve worked to understand my son’s brain. I’m deeply grateful to the NYU Child Study Center for helping us get a diagnosis in what felt like a sea of possible neurodivergent disorders — and to the psychologist there who gave us a behavior plan, helped us grow as parents, and helped us better understand and appreciate our brilliant kid. I’m grateful to Dr. Larry Rosen, our functional medicine pediatrician, who tested for gut health issues, food allergies, and histamine disorders, identified my son’s egg allergy, resolved his eczema, and helped us stabilize the impulsive behaviors that were hardest to manage. And to Dr. Gelb and the team at the Gelb Center in NYC for practicing modern airway medicine — my son’s palate expander, alongside targeted supplements, cleared up his chronic congestion and mouth breathing. Most of all, I’m grateful to live in a time when cognitive differences aren’t just recognized — they’re understood as superpowers. I never had an ADHD diagnosis growing up. It wasn’t recognized unless you had behavioral problems at school, and even then it was rarely diagnosed in girls. I went to an all-girls school where ADHD was something we almost never heard about. But looking back, many of my struggles as a kid were likely ADHD in disguise — the same variant my son has. For both of us, it shows up as intensity, hyperfocus, irritability, fidgeting, an almost desperate need to always be occupied. In recent years I’ve come to see that I genuinely don’t know how to be without somewhere to be. I’ve operated at warp speed since middle school, when it felt like a giant light bulb turned on — my academic abilities suddenly lit up. Looking back, that was puberty. Estrogen probably gave me the lift. Now, as a mom of a neurodivergent kid who doesn’t obviously present that way (his school has no idea — he excels academically), I’m still slowly learning to understand his brain. And in turn, my own. I’ve always said longevity for women is about taking care of your brain, bones, and booty . In this case, the brain part doesn’t just mean long-term cognitive function. It means building a new appreciation for my differences, developing maturity with my son as my mirror, and cultivating a deeper self-love. What could be more important than that. Stay strong, stay curious and breathe, Robin ⚡️ One last thing… At Parsley, we treat the whole picture. If you’re dealing with brain fog, mood changes, or focus issues in midlife, we don’t just hand you an antidepressant. We look at your hormones, sleep, nutrients — and yes, whether ADHD might be part of your story. This is functional medicine at its best: mind and body, connected. Book your Parsley labs here → or bring your own and book a consult for a full analysis and personalized plan. Join Parsley using RBMDCREW to save $100 on your membership. Frequently Asked Questions How does perimenopause cause ADHD symptoms in women? Estrogen is your brain’s dopamine stabilizer — it boosts dopamine production, improves receptor sensitivity, and slows dopamine breakdown. When estrogen crashes and swings wildly in perimenopause, dopamine becomes unstable, and focus, working memory, and emotional control all suffer. For women who masked their ADHD for decades, perimenopause removes the hormonal buffer that was quietly holding things together. How do I know if it’s ADHD or just menopause brain fog? Both can be true, and it matters which is driving things — because the treatment differs. True ADHD starts in childhood, even if the symptoms were subtle or well-masked. Women with pre-existing ADHD worsened by hormones often need both HRT and ADHD treatment, while women with hormonal brain fog alone usually respond to HRT without ADHD meds. A good clinician helps you tell them apart. Does exercise actually help with ADHD symptoms? Yes — the dopamine spike after cardio mirrors what stimulant medication does chemically, producing immediate reductions in inattention and impulsivity. I recommend 20–30 minutes at 65–85% max heart rate, 3–5x per week. Layering in yoga 2–3x per week adds longer-term benefits: a meta-analysis of 19 RCTs found it improved working memory, impulse control, and cognitive flexibility with medium effect sizes. What supplements help with ADHD in women? The two I focus on are fish oil (1–2g daily at a 4:1 EPA to DHA ratio), which shows consistent modest improvements in inattention across multiple trials, and magnesium glycinate (200–400mg at night). Adults with ADHD test lower in magnesium, and it helps with hyperactivity, the late-day stimulant crash, and doubles as sleep support. Scientific References JAMA Network Open, 2019 — ADHD diagnoses in adult women rose 344% between 2007–2016 Journal of Attention Disorders, 2025 — Perimenopause removes hormonal buffer in women with ADHD Journal of the International Neuropsychological Society, 2023 — 43% of women first diagnosed with ADHD between ages 41–50 Frontiers in Global Women’s Health, 2025 — 54% of women with ADHD have debilitating perimenopausal symptoms; perimenopause starts up to 10 years earlier (N=5,392) Journal of Global Health, 2025 — Cardio produces immediate reductions in inattention and impulsivity mirroring stimulant medication Journal of Attention Disorders, 2023 — Meta-analysis of 19 RCTs: yoga improved working memory, impulse control, and cognitive flexibility Frontiers in Nutrition, 2025 — Fish oil shows consistent modest improvements in inattention across multiple trials Keep Reading Is estrogen the ultimate longevity drug? How to Slow Brain Aging Starting in Your 40s My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to Pick a Protein Bar That’s Actually Healthy
URL: https://www.robinberzinmd.com/healthy-protein-bar-guide/
Updated: 2026-03-01 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Most protein bars are ultra-processed junk in disguise. Here’s what to avoid, the 4 bars I actually recommend, and why ingredients matter more than the ma
55% of our calories now come from ultra-processed foods (UPFs). When I bring this up, I often hear, “Not me. I don’t eat candy, chips, or sugary cereal!” But UPFs don’t always look like junk. They hide behind “healthy” labels (flavored yogurt, veggie chips, granola bars). And few disguise themselves better than the protein bar. Robin’s Short Version Sugar Caps Matter: Even “healthy” bars like Clif pack 16g of added sugar—over half your recommended daily limit. The Bar Formula: Aim for under 10g sugar, 4g+ fiber, and leucine-containing protein to avoid blood sugar spikes and gut stress. Hidden Gut Risks: Emulsifiers like carrageenan and mono/diglycerides are linked to gut inflammation and cancer risk per PLOS Medicine, 2024. As a busy mom, I totally understand the pull. Shelf-stable snacks make the week survivable. But here’s the problem: kids and adults are getting a significant chunk of their daily calories from what are essentially edible science experiments. UPFs have been directly linked to higher cancer risk, earlier death, and worse mental health outcomes ( British Medical Journal , 2024). So the big question is: Can you find a bar that actually supports protein goals, doesn’t spike blood sugar, and is safe for the whole family? Let’s investigate. 🤓 What to know: Most “health” bars will spike your blood sugar and stress your gut microbiome. When I was growing up in the ’80s and ’90s, your options were: granola bars, PowerBars, or candy bars. Then came the 2000s—hello bar explosion. Now we’ve got entire aisles of so-called “smart” snacks. But just because something brags about protein doesn’t mean it’s a smart choice. Here’s why most bars fail my test: 💣 Sugar Bombs in Disguise Even the most innocent-looking bars often pack 12–20g of added sugar. Example: A Clif Bar contains 16g of added sugar— more than half the recommended daily limit . Sneaky sweeteners like sucralose and acesulfame potassium (hello, “low carb” claims) may disrupt the gut microbiome and interfere with glucose metabolism. 🐮 Protein at Any Cost Most bars use cheap whey protein from industrial dairy, often sourced from cows treated with hormones, antibiotics, and fed pesticide-laced feed. Quality matters: The most bioavailable protein still comes from animal muscle , not isolated powders. Plus, your body can only use ~20–30g of protein at once for muscle synthesis. More than that = no extra gain, but potential kidney strain and digestive discomfort. 🌱 Missing the Fiber Fiber is essential for heart health, blood sugar stability, and hormone regulation. Yet most bars are fiber-poor. Even those with oats or nuts often have <3g of fiber , which doesn’t cut it. You want 4g+ per snack if possible. ☠️ Franken-Ingredients Emulsifiers like mono/diglycerides and carrageenan are linked to gut inflammation and possible cancer risk ( PLOS Medicine , 2024). Novel fat substitutes like EPG (used in David Bars) are not fully digested, not long-term studied, and may affect nutrient absorption, microbiome composition, and cardiovascular markers. 💪 What to do: Look for bars with non-dairy protein, less than 10g of sugar, and gluten-free organic ingredients. Bars can absolutely be part of a smart routine, but they should be a bridge snack , not a meal replacement. Also: they’re not immune to context—what works for a post-workout teen might not work for a perimenopausal mom. When evaluating a bar, I look for: ✅ Under 10g of sugar (Check serving size: some bars are multiple servings.) ✅ Well-sourced protein (Animal, egg, or plant-based protein + leucine.) ✅ Organic or grass-fed ingredients ✅ 4+ grams of fiber ✅ Gluten-free (To support gut health and reduce inflammation and bloating.) 3 bars I actually recommend After vetting dozens, here are three that pass my test ( with caveats) : 🥩 EPIC Wagyu Beef Snack Strips 6g of clean, animal-based protein Only 2g of sugar Whole ingredients, gluten-free Caveat: Not enough protein for a full snack on its own—I usually eat two. 🥜 Big Spoon Roasters Peanut Butter Bars 11g of plant-based protein No refined sugar, 4g fiber, gluten-free, organic, filling Caveat: Peanuts are low in lysine, so they’re not considered a complete protein. Better as a filling, low-sugar snack than a muscle-builder. 🌿 Immortal Vegan Protein Bars 15g plant-based protein Organic, gluten-free, whole food ingredients Caveat: Uses pea protein, which isn’t naturally a complete protein unless enhanced with other aminos. Good for gut health; not ideal post-lift. 🐮 Jacob Beef Tallow Protein Bar 20g complete grass-fed whey protein 9g prebiotic fiber Sweetened with honey; no sugar alcohols Caveat: If you tolerate dairy, a clean whey-based bar can be great. If you’re sensitive to dairy proteins, these can trigger inflammation, bloating, or skin issues. Got one you love that I didn’t list? Reply and tell me. I’m all ears! ⚡️ Quick hits 🍟 French fries & diabetes A new Harvard study tracking 200,000 for 30 years found that eating french fries 3x per week is linked to a 20% higher risk of type 2 diabetes. French fries (though delicious) are metabolic kryptonite thanks to refined flour coatings and inflammatory seed oils. Bake sweet potatoes or russets with EVOO and sea salt. This handy fry-cutting gadget makes it simple. 🍷 Glutathione & alcohol When you drink alcohol, your liver uses up glutathione, the body’s master antioxidant, to detoxify it. To support recovery after a night out, supplement with NAC (N-acetyl cysteine), a key glutathione precursor. I like this one (which also has Zinc and Vitamin C) to keep antioxidant levels up and inflammation down. 🩸 Safe cycle tracking Safety concerns over period app data are in the news again . I use two highly-vetted wearables Whoop (helps you sync your workouts to your cycle) and Oura (just launched perimenopause features) without fear of my data being shared. For a non-wearable tracker, I like Stardust —it’s beautiful, engaging and committed to privacy. 💛 The Momgevity Files Late Friday afternoon, after a very long work week—three-day executive offsite, multiple team dinners, late nights, plus solo parenting while my husband traveled—I hit a wall. Let’s be honest: all I wanted was to crawl under a blanket and watch The Lion Guard with my 5- and 3-year-olds. But instead, I logged onto a 45-minute Zoom Pilates class with weights. Why? Because, also being honest, I hadn’t worked out since the previous Sunday. The core work and goblet squats left me feeling calmer, clearer, and more energized. ( Duh , you might say.) But wow, it’s hard for me to fit in exercise right now. That’s a problem, because the research is beyond clear: movement—especially weight training, Zone 2 cardio, and HIIT—is the closest thing we’ve got to a longevity superpower. You can take all the peptides, eat all the protein, and track your bloodwork religiously. But nothing replaces exercise. Nothing even comes close. Instead of spiraling into guilt or self-judgment, I told myself what I tell my patients (and what Buddhist teachers have been saying for centuries about the path to enlightenment): Begin again. Or in the words of Dr. Oz (my old boss—that’s a story for another day) who blew my overachiever A-student mind in 2006 by saying: “Don’t let perfect be the enemy of good.” On Saturday, I got in the infrared sauna (shown to mimic some of the cardiovascular benefits of exercise). On Sunday, I went to yoga and cleared the cobwebs from my fascia after a sluggish week. On Monday, I did Rocamoons’ 25-minute HIIT class (one of my faves, who I discovered via her IG recs). And today? I probably won’t exercise. My husband’s still away. There are the usual demands of work, kids, life, etc. But I’ll track my steps and be grateful that in NYC, the subway does give something back: a reliable way to hit 7,000+ steps a day. (Even if the sweat and smells rob my soul.) I’ll remind myself it’s all OK. Because I’ll begin again. Stay strong, stay curious, and breathe, Robin Keep Reading 10 nutrient-dense snacks I pack on-the-go Are seed oils toxic to your health? Is “fibermaxxing” the key to slowing aging? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Mold Symptoms: Are Mycotoxins Behind Your Illness?
URL: https://www.robinberzinmd.com/mold-symptoms/
Updated: 2026-03-01 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Is mold exposure making you sick? Here’s why mold symptoms can be so hard to identify and how we treat biotoxin illness at Parsley.
Plus, the optimal eating window and broccoli for cold symptoms. Robin’s Short Version Genetic Vulnerability: 25% of people carry an HLA-DR variant that triggers chronic inflammation even at mold levels others tolerate without issue. Modern Toxic Load: PFAS, microplastics, and pesticides already overwhelm detox pathways, making mold the tipping point that pushes the body into CIRS. Smarter Testing: ERMI or HERTSMI-2 dust tests outperform air samples; pair them with a urine mycotoxin panel to pinpoint species and exposure load. When did everyone become so afraid of mold? I​​f you run your hand over your desk right now, I hate to break it to you but…there’s mold. Mold comes in hundreds of thousands of species and has been on Earth forever . But lately, it feels like everyone’s panicking about it. So what changed? It’s not the mold, it’s us . Most mold exposure isn’t a problem. Some people can clean out a moldy attic, inhale lungfuls of Aspergillus, and be totally fine. Others experience a form of biotoxin illness where mold exposure causes a chronic inflammatory response (CIRS) and wreaks havoc, leading to everything from unexplained weight gain, to chronic fatigue, to bloating and digestive issues, to headaches to an impaired immune response. At Parsley, we’ve spent a decade treating mold illness and (spoiler) it’s a lot more nuanced than TikTok makes it seem. Here’s how to know if mold could be behind your brain fog, fatigue, or “weird” symptoms and what to do if it is. 🤓What to know: Mold is ancient but modern bodies are struggling with it. Mold is not new and not always dangerous. But modern immune systems? Not the same story. Between PFAS, microplastics, pesticides, and endocrine disruptors, our detox systems are already overloaded. For some people, mold tips the scale. 🦠What is mold illness? Also known as biotoxin illness or chronic inflammatory response syndrome (CIRS) , it’s when your immune system overreacts to toxic compounds called mycotoxins that mold releases into the air. An estimated 25% of people carry a genetic variant (HLA-DR haplotype) that makes them more likely to have this kind of extreme response. For these people, even low-level exposure can set off: Persistent inflammation Mitochondrial dysfunction Brain fog, fatigue, hormone shifts ⚠️ What mold does to your body The top mold culprits are: Aspergillus → common in contaminated foods like grains & coffee Penicillium → lives in water damaged walls Stachybotrys (“black mold”) → thrives in organic materials like wood, compost & potting soil Fusarium → found anywhere it’s damp, like bathrooms & basements Chaetomium → grows where there’s long-term water damage Research shows exposure to mycotoxins produced by these strains of mold is linked to: ❌Lower glutathione, the body’s master antioxidant ( Toxins , 2014) ❌Kidney damage ( International Journal of Molecular Sciences , 2021) ❌Neuroinflammation, brain fog, memory and mood problems ( Brain Behavior Immunology , 2021) ❌Various types of cancer ( Life , 2023) ❌Impaired immune activity and autoimmune conditions ( International Journal of Molecular Sciences , 2021) ❌Estrogen metabolism disruption and impaired fertility ( Toxins , 2024) ❌Weakened gut barrier integrity ( Toxins , 2020) 🧩 Could mold be behind your symptoms? Because it affects so many systems, mold-related illness can look like: Brain fog or fatigue Digestive issues, bloating, SIBO Sinus congestion or frequent infections Skin rashes or eczema Headaches, light sensitivity Histamine intolerance Tingling, numbness, muscle pain Weight gain or loss Anxiety or mood swings Night sweats, urinary urgency Painful or heavy periods If you’re one of the 25% genetically predisposed to mold sensitivity, our Parsley Health team includes some of the nation’s top mold-literate MDs. Don’t go it alone . 💪 What to do: Test, remove, repair, reset. Mold recovery is a process, not a one-and-done detox tea. Here’s how we approach it at Parsley Health: 🔬 Step 1: Test (the right way) Environmental testing: ERMI or HERTSMI-2 (dust-based tests are more accurate than air samples) Focus on identifying species + load, not just presence. We’re all living with some level of mold. Clinical testing: Urine mycotoxin panel (we use Real Time Labs) Bloodwork for inflammation markers, liver enzymes, and nutrient status ⚠️ A positive test = exposure, not necessarily illness. This is why it’s so important to work with a mold-literate provider to interpret results. ❌ Step 2: Remove the source Remediate your home to remove existing harmful growths Check for leaks, keep indoor humidity < 50%, clean AC drip pans and filters monthly HEPA air purifiers can remove up to 99.9% of airborne mold spores 🧬 Step 3: Start mast cell stabilization Mast cells are a type of immune cell that releases histamine and other inflammatory chemicals when triggered. Protocol can include: H1/H2 histamine blockers Professional-grade herbal support (quercetin, nettles) DAO-enzymes ♻️ Step 4: Support elimination in your body Get regular: A daily bowl movement supports the detox protocols below Binders: Activated charcoal, bentonite clay, or prescription cholestyramine bind mycotoxins in the gut Fiber: 30–50 g/day Hydration: 2–3 L water daily + electrolytes Sweat: Infrared sauna and regular exercise can boost toxin clearance 💪 Step 5: Rebuild the body’s immune response Antioxidants : Glutathione, NAC, alpha-lipoic acid, vitamin C Mitochondria : CoQ10, acetyl-L-carnitine Gut repair : Probiotics + anti-inflammatory foods (think: turmeric, leafy greens) Immune modulation : Omega-3s, vitamin D, curcumin, quercetin 🌱 Step 6: Reset your diet Mycotoxins activate inflammatory pathways (NF-κB, IL-6, TNF-α) linked to chronic disease. Support your system by: Avoiding mold-heavy foods: aged cheese, peanuts, grains, wine Eating anti-inflammatory: leafy greens, berries, omega-3s Prioritizing gut health for better toxin elimination ⚠️ The bottom line: mold isn’t the enemy—overload is. For most people, the goal isn’t “zero mold” exposure; it’s a steady state where your immune system recognizes mold as background noise, not a five-alarm fire. ⚡Quick Hits 💊 Multi-vitamins reduce aging afterall A randomized controlled trial with 3,500+ participants showed taking a daily multivitamin improved memory and cognitive performance in older adults—roughly equivalent to reversing ~3 years of age-related memory decline. Don’t skip your multi . 🥦 Broccoli extract reduces cold symptoms 100 mg sulforaphane from broccoli seed extract cut daily cold symptoms by 40% in a placebo-controlled trial . The study was small (< 100 people) but with no negative side effects, this falls into the “can’t hurt might help” bucket. I’m considering adding broccoli seed extract to my stack this fall. ⏰ 11-Hour Eating Window Improves Longevity A study of 33,000 adults found eating for ~11–12 hrs/day reduced mortality risk. More or less than that? Mortality risk went up. 💛 The Momgevity Files I was in LA this week for a women’s health summit on female longevity. I spoke about my Brains, Bones, and Booty protocol and why it’s never too early or too late to build muscle, strengthen bones, and protect brain health. I was even more excited to be an audience member and to connect with friends like Dr. Jessica Shepherd and Dr. Deepika Chopra. Seeing my people always makes me so happy. There’s something about nerding out with others who love what I love (read: all things health and wellness) that fills me up more than anything. The headline speaker was Selma Blair, whose public journey with Multiple Sclerosis has become her calling. She shared how, at the time of her diagnosis, there were virtually no resources except for end-of-life care. The idea of living with the disease wasn’t even considered. It reminded me of a close friend—early 40s, battling aggressive cancer—who told me she hid it for two years. As a successful businesswoman, she felt ashamed to be sick. When she finally went public, she said it felt like the sky opened up. There’s so much shame in our culture around illness. We’ll embrace “longevity” and “optimization” but deny being sick. At Parsley, I see it all the time—people come for weight loss or energy, but once they fill out our symptom score, or sit down with one of our doctors, the real story comes out: chronic bloating and reflux, unexplained joint pain, an endometriosis diagnosis, infertility. I’ve lost count of how many are ready to take GLP-1s or try a detox to lose weight but haven’t seen a medical provider for their autoimmune symptoms. There’s a chasm we all have to cross, especially as women, from denial to acknowledgment. It’s easier to bury things, minimize, deny, or focus on something less scary. Whether it’s our health, our kids, our marriages, or careers. For me, that chasm was about sharing that I have a neurodivergent child and being open about everything I’m doing to support him. For a long time, admitting the challenge felt like shining a light on something I didn’t want to face. But I’ve learned that the power comes in the embrace. Not through complaining or obsessing or staying stuck in the hard stuff but through a different kind of openness. One that says: This is here. I see it. I own it. It’s here to teach me something. And I’m not ashamed. If we want to truly experience longevity, we have to own the illnesses we carry. Be honest about our symptoms. And create the kind of openness that lets healing in. Longevity starts when we cross the chasm—and leave the shame behind. Stay strong, stay curious, and breathe, Robin Keep Reading Are seed oils toxic to your health? My personal microplastics protocol How to boost your immune system before it fails Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to Slow Brain Aging Starting in Your 40s
URL: https://www.robinberzinmd.com/slow-brain-aging-40s/
Updated: 2026-03-01 · Topics: Brain, Mood & Nervous System
Summary: Your brain shrinks 5% per decade starting at 40. Here’s my 6-step protocol — labs, exercise, HRT, supplements — to slow cognitive aging before symptoms ev
What’s younger? Your brain or your body? Neuroscientists are obsessed with the idea of the “brain age gap,” a way to measure how your brain is aging compared to your actual age. Robin’s Short Version Brain Shrinks Early: Your brain loses roughly 5% of its volume per decade starting around age 40, well before any symptoms appear. Exercise Is Non-Negotiable: Cardio twice a week plus strength training two to three times a week is the top protocol for boosting BDNF, the brain’s neuroplasticity driver. Hormones Protect Memory: Starting estrogen therapy within 10 years of menopause can lower Alzheimer’s risk, which affects two-thirds of all diagnosed women. I saw this gap play out with my 95-year-old grandmother. Her mind stayed razor sharp; it was her body that failed her. Now I see the opposite in clinic—40-somethings asking if they’re losing it because they forgot a name. Spoiler: It’s much less likely to be a sign of early dementia than what I call SMMD (Social Media Memory Disorder), a symptom of the constant overload of information that makes it hard to hold on to anything. But those moments are worth paying attention to—your brain ages faster than you think. Here’s what to do about it. 🤓 What to know: Your brain starts shrinking at age 40. We talk a lot about aging bodies, but not enough about aging brains. The brain starts shrinking around age 40 , losing 5% of its volume each decade ( Frontiers in Aging Neuroscience , 2022). Cognitive decline starts long before disease develops. This is when many of us start noticing dips in working memory and processing speed. 🧠 What ages the brain? Brain aging is fueled by a mix of metabolic, hormonal, vascular, and inflammatory stressors . Here are the big ones: Blood sugar spikes → Damage blood vessels + impair insulin in the brain Cardiovascular disease → Brain needs 20% of your oxygen—reduced flow = reduced cognition Inflammaging → Chronic inflammation breaks down neurons + energy production Low omega-3s → Your brain is 60% fat. Neurons rely on healthy fats (especially DHA) to fire properly Pregnancy → Depletes DHA if not replenished with supplementation Menopause → Estrogen supports mood, memory, and cognitive ability; its loss during menopause loss drives higher Alzheimer’s risk ( Frontiers in Molecular Biosciences , 2025) Heavy metals → Lead + mercury impair mitochondria + cognition over time Nutrient gaps → Low B12, vitamin D, magnesium, folate impair memory and the brain’s ability to send electrochemical signals ⚠️ Signs your brain might be aging faster than your body The reality is, 1 in 9 people will be diagnosed with Alzheimer’s after the age of 65 (two-thirds of them are women) and almost all of us will start noticing symptoms of cognitive decline in our mid-40s ( British Medical Journal , 2012). But early brain aging doesn’t look like dementia. It looks like: Forgetting words mid-sentence Struggling to multitask Slower learning or recall Brain fog after meals Mood shifts or irritability Feeling mentally “tired” faster More serious signs: Trouble remembering new info Getting lost in familiar places Difficulty understanding or finishing sentences Noticeable personality changes 🔍 How to measure your brain age There’s no single “brain age” test, but we can measure how the brain is aging across structure, function, metabolism, and biology. 🧠 Structural Imaging (MRI) Measures: Brain shrinkage, white matter integrity, hippocampal volume Why it matters: A full-body MRI like Prenuvo (available through Parsley ) can tell if your brain is shrinking faster than expected 🧠 PET Scans Measures: Glucose metabolism (declines decades before symptoms start), amyloid plaques and tau tangles (early markers of Alzheimer’s) Why it matters: The most powerful tool we have for detecting early neurodegenerative changes. 🧠 SPECT Imaging Measures: Blood flow to different brain regions Why it matters: Low perfusion is a red flag for aging and mood changes 🧠 Neural Activity Mapping (MEG + EEG) Measures: Electrical activity and neural communication Why it matters: “Brain age” algorithms can estimate biological brain age via signal speed 🧠 Functional Cognitive Testing Measures: memory, processing speed, executive function, attention. Why it matters: Tools like CNS Vital Signs (CNSVS) give you a real-time performance snapshot. 🧠 Epigenetic Age Tests Measures: DNA methylation patterns via tests like TallyAge Why it matters: Accelerated biological age is strongly correlated to decreased brain function ( Nature Scientific Reports , 2024). 💪 What to do: Prioritize nutrient support, cardio, HRT, and heat therapy. Here’s what I recommend to patients (and practice myself): 🧪 Step 1: Test biomarkers that predict cognitive aging ApoB (< 80) → high levels accelerate vascular aging, including in the brain. Fasting insulin (1-6) + HOMA-IR (< 1.5) → insulin resistance is a major driver of cognitive decline. Omega-3 index (> 6) → low DHA directly impairs neuronal membranes. Heavy metals (mercury < 3; lead < 1) → both accumulate in the brain and impair mitochondrial function. hs-CRP (< 1) → systemic inflammation = “inflammaging.” Food sensitivity test (KBMO) → Uncovers gut-brain inflammation 💪 Step 2: Strength 2-3x per week; cardio 2x per week. BDNF is the driver of neuroplasticity—your brain’s ability to learn, adapt, repair, and stay young—and it declines as you age. Exercise is the #1 way to boost it. Cardio: Even one session increases BDNF; harder efforts = bigger boost ( European Journal of Neuroscience , 2017). Strength training: increases baseline BDNF levels in older adults by improving insulin sensitivity, reducing inflammation ( Geriatric Nursing , 2023). 💊 Step 3: Supplement to plug nutrient gaps + lower inflammation Omega-3s (EPA + DHA): 1–1.5g/day supports neuron health; boosts BDNF after ~10 weeks ( Clinical Nutrition ESPEN , 2023). Magnesium threonate: More effectively crosses the blood-brain barrier than glycinate; helps memory ( BMC Neuroscience , 2020). Urolithin A: Supports brain energy metabolism by removing damaged mitochondria ( Nature Metabolism , 2019). Vitamin D, B12, folate: Critical for cognition, mood, myelination 🌸 Step 4: Consider HRT during menopause Started within 10 years of menopause (or before age 60), estrogen therapy can: Lower risk of Alzheimer’s disease ( Alzheimer’s Risk and Therapy , 2024) Slow biological aging ( JAMA Network Open , 2024) Read my full HRT protocol here . 🤓 Step 5: Challenge your brain with novelty Engaging in challenging, creative activities can make the brain act 3–6 years younger ( Nature Communications , 2025). Try: Taking up dance, art, or music Trying a new sport (my husband picked up ice hockey in his 30s; my mother started Pilates in her 90s) 🔥 Step 6: Add heat therapy to your recovery 20+ minutes of sauna (176–194°F) or a hot bath (108°F) reliably raise BDNF levels ( PLOS One , 2021). ⚡️ Quick Hits When it comes to making health fun to read about, few people do it like my friend Derek Flanzraich with his smart, witty newsletter 5HT . I asked him about what grabbed his attention in health headlines this week! 🥜 Peanuts are making fewer parents nuts. A new study in Pediatrics found peanut allergies have been cut in half (!) since parents started introducing peanuts earlier—typically around 4–6 months, thanks to updated guidelines. How cool is that?! Besides Trader Joe’s Bamba Peanut Snacks (sometimes), my favorite peanut-y thing to make for my kiddos is apple slices & peanut butter (it’s a classic for a reason). 💪 Grip it real good. A UK study of 93K+ adults over 13 years found stronger midlife grip strength predicted slower disease progression and lower mortality. Those with a stronger grip in their 40s–60s were less likely to develop obesity-related diseases or die early. My favorite way to boost grip strength? Rock climbing , where “getting a grip” pays off. 🚶 Walking for the win. New research shows walking a few thousand steps a day can slow cognitive decline in older adults at higher risk of Alzheimer’s. As someone with a family history, I take prevention seriously, and, according to science, one small step for your body is one giant leap for your brain. (FWIW, benefits peak around 5K–7.5K steps.) To see what other levers I’m pulling, see my personal Alzheimer’s & Dementia prevention plan . If you like health takes that are both clever and credible, subscribe to 5HT ! 💛 The Momgevity Files I’m just getting back from health and wellness candyland—otherwise known as Eudamonia, the consumer health summit in West Palm Beach, now in its second year—where 5,000 people gathered to hear expert talks, explore the latest health and wellness products, work out with their favorite teachers, and connect with like-minded wellness enthusiasts. I’m exhausted in the best of ways. I spoke three times: I recorded a live podcast with Dr. Will Cole; joined a mainstage panel on AI in healthcare with Dr. Mark Hyman, a functional medicine pioneer, and Dr. Dave Rabin, founder of ApolloNeuro; and delivered a keynote on female longevity on Saturday that I’m especially proud of. I also gave press interviews, hosted one-on-one office hours with attendees, and caught up with friends like Rich Roll, Dr. Jessica Shepherd from HERS, Dr. Amy Bilken (one of my favorite hormone experts) and Jeff Krasno and Schuyler Grant of One Commune. (P.S. Announcement coming soon on my first longevity retreat with Commune!) Our Parsley Health team was there too. We don’t usually do booths at events like this, but we made an exception—and I’m so glad we did. The hundreds of people who stopped by to ask questions or get their Parsley Symptom Score with one of our health coaches reminded me why we do this. The exhibit hall was a sight to behold: from massage robots to vibrating chairs that stimulate dopamine, to a new kind of air filter using AI algorithms to detect and remove mold and pollution from your home, the advances in tech for optimal health were fascinating. The best part of the event for me personally was being with my people. Over the past few years, I’ve spent a lot of time at traditional healthcare industry conferences—rooms filled with execs from insurance companies, government agencies, large employers, hospital systems, and investment funds. It’s been a privilege to share functional medicine in those settings. But where I truly feel at home is among people whose personal and professional passion for health and wellness runs deep. It’s one thing to try to incrementally improve the existing system. It’s another to completely rethink the model of proactive, preventive health from the ground up. Two personal highlights to share: First, my talk, Nine Ways to Supercharge Female Longevity , had such strong registration that I was assigned to the grand ballroom—the same stage where Dr. Andrew Huberman spoke that day. It was a massive space with a giant stage and enormous screens. I was paranoid it would be empty—people sign up for talks, but with so much happening at once, they don’t always show. The night before, I ran around asking friends to come—even for 15 minutes—so I wouldn’t be lecturing to just seven people in a cavernous room. A friend texted me the morning of the talk with a kind reminder: “No one fills up the big room their first time in it. You grow into it, you make it yours.” Happily, over 300 attendees showed up to hear my female longevity protocol and the stories of my grandmothers, my mom, and my daughter. I think I made the room mine. As I was running to my room to change for dinner, I ran into Dr. Jeffrey Bland—the man who founded the field of functional medicine over 30 years ago. He started the Institute for Functional Medicine, co-founded Bastyr (the naturopathic college in Seattle), and has launched numerous companies from Metagenics to Big Bold Health. He is a legend. We stopped to say hello, and out of nowhere he said: “Robin, I am so proud of you. What you have created in Parsley is what I dreamed would happen for functional medicine. You made it real.” Nearly in tears, I told him what an honor it is to play even a small part in continuing his work. He’s a north star for me: I want to keep creating throughout my life in a way that transforms health, just as he has, and at such a high level. We hugged. It was a powerful moment for both of us. The ninth step in my female longevity protocol is Community. People with strong social connections live significantly longer, while loneliness carries the same mortality risk as smoking 15 cigarettes a day— for a lifetime . I feel incredibly lucky and grateful to have such a clear sense of purpose and to be part of an inspired, inspiring community. It was hard to be away from my kids for yet another trip, but this one filled me with enthusiasm and clarity for what’s ahead. The kind that carries you a long way. The kind that reminds you why longevity matters in the first place. Stay strong, stay curious, and breathe, Robin Join Parsley using RBMDCREW to save $100 on your membership. Keep Reading The best diet for brain health? The best “calm tech” to hack your vagus nerve Is estrogen the ultimate longevity drug? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Loooongevity: Which Treatments & Therapeutics Actually Work?
URL: https://www.robinberzinmd.com/which-longevity-treatments-therapeutics-actually-work/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: I’ve reviewed the full spectrum of longevity treatments — from lifestyle to therapeutics. Here’s my honest breakdown of what the evidence actually suppor
Hi everyone – Robin’s Short Version Test One at a Time: Combining multiple longevity treatments at once makes it impossible to know what’s helping or causing harm. Clinic Red Flags: Many longevity clinics default to offering “the works” rather than identifying which specific therapeutics match your actual health goals. Define Success First: Before any treatment, clarify your specific goals and how you’ll measure results — without this, you can’t know if it worked. I hope you had a great Thanksgiving. Mine was spent at home in Brooklyn, cooking a largely gluten-free, dairy-free meal with my husband for our kids and parents, and having some much needed downtime. If you went somewhere fantastic or braved the holiday travel crush – I salute you..and have zero FOMO. As we head into the holiday season, today’s hottest wellness topic, Longevity, is top of mind for many of my patients. Health optimization and longevity have long been core to our practice at Parsley – I was even just named one of the 8 Top Female Longevity leaders by SheKnows. We’re probably the only place you can get everything celebrity longevity doctor Peter Attia offers in his practice at the same quality with top board certified doctors, including all the advanced tests, prescriptions, supplements and personalized care, but a fraction of the price and for many covered by insurance. NBD:-) The Keys To Longevity The keys to longevity—primarily those within your control—revolve around diet, physical activity, sleep quality, stress management (whether constructive or destructive), and exposure to environmental toxins. During certain times of the year, such as holidays, summer, personal and work travel, and winter, many of these “keys” are often temporarily disregarded. This isn’t a novel observation. However, I’ve recently noticed an increasing number of patients, friends, and followers turning to medical longevity treatments as a sort of “cleanse.” They view these treatments as a quick fix to compensate for periods of unhealthy living. As new clinics and practices emerge to meet this demand, I also observe people investing in these therapeutics without fully understanding what they’re purchasing, both in terms of value and safety. To help you navigate this trend, let’s discuss some of these treatments, their potential value, and provide a foundation for deciding whether to try them. What Are Longevity Therapeutics? Medical longevity therapeutics encompass a broad range of treatments and therapies, including exosomes, Wharton Jelly stem cell injections, Hyperbaric Oxygen, Ozone therapy, and Ketamine IVs. Injectable peptides would also be on this list, had they not been recently prohibited by the FDA. These treatments are administered in medical settings under the supervision of physicians (hopefully) and represent a step beyond popular biohacker choices like cryotherapy and nutritional IVs. A recent patient of mine underwent several Ketamine treatments, Wharton Jelly and exosome injections for injury areas, Ozone therapy (blood), NAD+ IVs, and Stellate Ganglion blocks at a specialized doctor. This cost her thousands of dollars. When she asked for my opinion on undergoing all these procedures, I asked her: “Why did you go? What were your health goals? And how do you feel now?” She sought to repair joint injuries, alleviate osteoarthritis pain, boost energy and mental clarity, and essentially “reboot” after a stressful work period. When I asked if it worked, she said it was too soon to tell. How I Would Prescribe Longevity Therapeutics Do I recommend these therapeutics? My response varies—sometimes yes, sometimes no. But the most crucial aspect is our approach to them. Undergoing multiple therapeutics simultaneously makes it challenging to discern what is effective, where the true value lies, and what isn’t working. My concern is that some medical longevity clinics are more inclined to offer “the works” rather than identify which therapeutics are most pertinent and effective based on clinical history. They often lack involvement in ongoing medical care, leaving patients unsupported in the event of side effects or for follow-up evaluations. I would have preferred my patient to start with one therapeutic at a time, repeating and assessing the benefits of each, to truly understand the impact. All Of The Longevity Therapeutics You May Be Hearing About And What You Need To Know If you’ve been tempted to try some of these, or are hearing about them, it’s important to understand the evidence, if any, behind each and what they are for before you go out and spend a lot of money or risk a negative side effect. So let’s take them one by one: Ketamine Therapy . Ketamine is a non-psychedelic dissociative drug used in anesthesia that has been researched to also be effective in mood disorders. Most effective for chronic or major depression, chronic anxiety. Best if offered in a series of 3-5 sessions, with integration therapy afterwards each time. Mechanism of Action : Believed to be the increase in synaptic connections (think new neural pathways in the brain) mediated by glutamate receptor activity My POV: Ketamine, along with its psychedelic cousins, is a tool not a cure, is much more effective delivered IV in a therapeutic setting then mailed to you at home as a nasal spray and requires an experienced therapist for integration to deliver its full value. Wharton Jelly Injections . Wharton Jelly is connective tissue that comes from the umbilical cord, and is highly dense with mesenchymal (meaning non-embryonic) stem cells. Mechanism of Action: Injection of various sources of stem cells including adipose tissue, bone marrow and Wharton’s Jelly, has been used in the field of regenerative medicine and has been shown to incite a healing response, through lowering inflammation, and through signaling pathways too complex to summarize quickly here that result in localized repair of damage. My POV: In my experience, stem cell therapies are more effective for soft tissue injury (rotator cuff, MCL tear) and less effective for osteoarthritis, and even then can be hit or miss. I see them work about 50% of the time. I believe they are very promising — including for osteoarthritis — but more research is needed in how to best harvest and use them to make their impact more reliable. Exosome Therapy . Exosomes are extracellular vesicles — ie, microscopic bubbles that encase various chemical messengers such as proteins, RNA, DNA, and enzymes. Think of them as a school bus of sorts transferring a set of messages from one cell to another. Exosomes derived from mesenchymal stem cells, the same types of stem cells found in Wharton’s Jelly, are a new promising tool in regenerative medicine. Mechanism of Action: Exosomes derived from stem cells appear to elicit the same kinds of anti-inflammatory, immunomodulating and tissue repair response when injected to injury sites as the stem cells themselves. My POV: Nanotechnology enabling the targeted use of exosomes – both cell derived and even lab engineered versions – are super exciting – and early. Same POV as for stem cells themselves, their impact can be hit or miss and more research is needed to make these therapies reliable. Stellate Ganglion Block . This is an injection of anesthetic into a sympathetic nerve bundle (the fusion of 2 nerve bundles, a cervical bundle and thoracic bundle) on both sides of the neck. It’s typically used to treat chronic neuropathic pain, cluster headaches, to improve circulation in conditions like Raynaud’s, and recently is being trialed for mental health conditions including PTSD. It’s often a treatment of “last resort” when a cause is unknown. Usually most effective if done multiple times, and often lasts only weeks to months. Mechanism of Action: Believed to be the reduction of sympathetic (think fight or flight) tone in the nervous system. My POV: Absolutely worth a shot in chronic pain syndromes while evidence is mixed, if administered by experienced hands. Ozone Therapy . Ozone, or O3 (three Oxygen molecules together as opposed to two which is the type of oxygen we breathe) can be produced by a medical grade machine that converts O2 to O3 and is either administered rectally where it can be readily absorbed into the bloodstream by the thin GI lining, or by removing 250-500 cc of blood via IV, mixing in Ozone in a sterile IV bag, and re-injecting the ozonated blood back through the IV. This therapy has a limited evidence base and the FDA warned against it in 2019, however it is more commonly used in Europe as a therapeutic where it is regulated as such. Mechanism of Action: Theoretically germicidal/antibacterial, anti-inflammatory, and incites cellular repair My POV: I’ve seen this treatment be highly therapeutic in some cases of mold, lyme and chronic fatigue but the evidence base is limited and I don’t prescribe it. Hyperbaric Oxygen . This therapy has been around for a while, for treatment of everything from carbon monoxide poisoning to slow healing wounds. Lately this therapy is increasingly popular in regenerative medicine for stimulating stem cell proliferation and immune function. Mechanism of Action: Breathing in oxygen in a tank that creates high atmospheric pressure allows the lungs to absorb much more oxygen into the bloodstream than at regular atmospheric pressure. The oxygen itself once in the bloodstream is toxic to bacteria and other underlying infections and also appears to stimulate stem cell production and other growth factors involved in tissue healing. My POV: Well understood and long used for wound healing , I’ve seen HBOT be very effective for specific patients with chronic lyme, mold toxicity and chronic pain. I’ve also seen it fail for other patients with these conditions. When it comes to general wellness/regeneration, I’d put it in the ‘unlikely to hurt, might help’ bucket – in theory it’s strong but the evidence base isn’t there..yet. NAD+ IV . NAD+ – nicotinamide adenine dinucleotide – is a key coenzyme in the synthesis of ATP, the energy molecule of the body. It’s also critical to energy metabolism in general, meaning how you break down various substrates to create energy, and it influences immune function and cellular repair. In fact, over 300 enzymes rely on the presence of NAD+ to function. In addition, NAD+ appears to be related to aging, and using NAD+ to reverse or slow age-related body changes may be effective. (By the way, I am wildly oversimplifying here for the sake of keeping this short and digestible). Mechanism of Action: NAD+ delivered intravenously is thought to restore NAD+ levels and thereby improve healthspan by bypassing your stomach, where NAD+ molecules are broken down, and instead traveling directly to the tissues of your body, providing a natural boost of energy, as well as enhanced mood and awareness levels. My POV: Also in the unlikely to hurt, might help bucket. I’d love for there to be better trials on this because a “shortcut to aging” like NAD+ would be amazing. I just rarely see an IV like this be enough on its own to undo or compensate for not eating well, managing stress and moving. Understanding the Scope of Longevity Therapies Each of these therapies could warrant its own detailed newsletter. You might wonder, why doesn’t Parsley Health offer these therapies ? We do prescribe Hormone Replacement Therapy (HRT), including testosterone, DHEA, and both synthetic and bioidentical forms of HRT. I’ll delve into this topic in a future post. Additionally, we assist in heavy metal detoxification for patients with high levels of metals like mercury and lead, as confirmed by validated diagnostic tests. We also implement various antioxidant and pro-cognitive protocols aimed at memory enhancement and Alzheimer’s prevention, and we treat conditions such as migraines and chronic pain. Furthermore, we advocate for evidence-based supplementation, particularly when we have clinical evidence of its efficacy in improving health or remedying a deficiency. However, many of these novel longevity therapies lack a substantial real-world evidence base. At Parsley, we are dedicated to evidence-based care. Our focus is on treating patients with chronic diseases, coupled with health optimization and prevention strategies. Most of these objectives can be effectively achieved through prescription drugs, diagnostic tests, and personalized nutrition, supplement, and lifestyle interventions. Guided by an experienced doctor, these methods can provide 99% of the benefits in terms of longevity. It’s a fact: exercise is the most potent longevity drug available. While additional therapeutics can be transformative for some patients, we believe they should be pursued cautiously, under the care of responsible, board-certified doctors. The goal should be to achieve specific health outcomes—such as healing a damaged joint, treating long-standing depression, or eradicating an infection—rather than a full-on “kitchen sink” approach. This strategy not only saves you money but also ensures that you receive value from the treatments you choose. *** Product Recommendation: It’s getting cold so dry skin is now a thing in our house for a few months. My top skincare brands are Beauty Counter for clean, environmentally conscious high quality moisturizers and peels, Environ for a step up when it comes to being aesthetician/dermatologist-grade products (their AVST line has transformed my skin) and Egyptian Magic which is great for chaffed chapped or super dry spots. Keep Reading Chronological vs. Biological Age: Which One Really Matters? My personal supplement stack. Is NAD+ the key to energy and longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## You booze, you lose?
URL: https://www.robinberzinmd.com/is-it-okay-to-drink/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I’m often asked if any alcohol is okay, how often it’s okay to drink, what to drink if you’re going to drink, and how to supplement around alcohol use. S
Hi everyone – Robin’s Short Version Risk Scales Exponentially: Each daily drink raises cardiovascular disease odds by 70%; heavy drinking pushes that figure to 470%. No Safe Threshold: Alcohol is a confirmed carcinogen that harms sleep, gut lining, blood sugar, and immunity even at light intake levels. Conditions Change Everything: If you have cancer, diabetes, or heart disease, alcohol directly amplifies your specific risks and should be avoided as much as possible. The holiday season is in full swing, and I have events almost every night of the week leading up to the holiday break, and then again through New Year’s. Booze, as I’m sure you can relate, is everywhere. Despite recent news indicating that the share of Americans who choose to drink is declining and the general cultural norming of non-alcoholic alternatives—such as more restaurants reliably serving mocktails and low ABV options—from my vantage point, alcohol’s central place in our social lives hasn’t budged. I’m often asked if any alcohol is okay, how often it’s okay to drink, what to drink if you’re going to drink, and how to supplement around alcohol use. So, I’ll attempt to answer these questions here. For the record, I am not recommending consuming alcohol: The data on alcohol’s health impact is too clearly negative to recommend it. The potential benefits are too few and too hard to prove to outweigh the associated risks. But I’m also a realist. Given that the majority of our tens of thousands of Parsley patients drink alcohol on some level, I want to help people make smarter, healthier choices that work for them—and for you too. The Research The hard truth is that the toxic effects of alcohol are well-established , and no amount of alcohol has been deemed “safe.” Alcohol is a known carcinogen, increasing the risk of breast, liver, GI, and most other cancers. It also increases dementia risk, damages the gut lining, disrupts a healthy microbiome, affects sleep quality, causes blood sugar imbalances, and suppresses the immune system. Even light or moderate alcohol use triggers depression and anxiety. Furthermore, as many as 30 million Americans have a clinically unsafe relationship with alcohol, leading to motor vehicle and firearm deaths, as well as other social and professional problems. Most research on alcohol focuses on its known toxicity with moderate, heavy, or abusive intake. To date, research on the potential health benefits of low alcohol intake has mostly been observational, limited in their ability to factor out other health conditions, nutrition status, lifestyle, and genetics. Conducting higher-quality randomized control trials is challenging due to the known toxic effects of alcohol—it’s ethically problematic to encourage regular drinking. A recent highly-covered study published in JAMA of over 300,000 people over 10 years attempted to reduce some observational trial noise using a research method called Mendelian randomization. This study found that even among light drinkers, every one drink per day increased the odds of high blood pressure by 30% and cardiovascular disease by 70%. The impact of more alcohol isn’t just linear—it’s exponential. For moderate drinkers, odds of high blood pressure and heart disease increased by 70% and 80%, respectively. For abusive drinkers, these odds skyrocketed by 160% and 470%, respectively. Conversely, reducing alcohol consumption exponentially improves heart health, contradicting the historically repeated notion that some alcohol is good for the heart. So, What Do You Do Now? How do you use this information to make decisions about what and how much to drink, if, like me, you recognize that alcohol is a toxin contributing to various health risks, but you do not suffer from alcohol addiction or alcohol abuse disorder, and you genuinely enjoy a glass of wine or a cocktail once in a while? Step One: Assess your physical health status and risks If you already suffer from health conditions like cancer, diabetes, heart disease, high blood pressure, or any other chronic condition, alcohol will exacerbate these issues. It’s advisable to avoid alcohol as much as possible. Additionally, consider your family history of cancer, heart disease, and stroke, as alcohol can interact with genetics to heighten these risks. Step Two: Assess your mental health Do you have depression, anxiety, or insomnia? Alcohol will worsen these conditions. For instance, the sleep impact I experience from even a glass of wine after 7 pm isn’t usually worth it for me. Step Three: Assess your lifestyle and environmental exposure risks Do you smoke? Follow a highly processed, high-sugar, low-nutrient-density diet? Are you sedentary or exposed to a highly polluted environment? These factors pose health risks, and combining them with alcohol increases the likelihood of diseases you’d want to avoid. People are often surprised when I link these factors to alcohol, but the body can handle and recover from minor toxic injuries here and there, whether from sugar, air pollution, cleaning product chemicals, or ethanol. However, the chronic burden of these, along with others, leads to physiological overload, where our repair mechanisms struggle to keep up, resulting in disease. From here, if you are generally healthy and none of the above factors significantly affect you, or if you simply don’t care about health advice and plan to drink socially, here’s what I recommend and practice for myself, as I do drink alcohol on a limited basis: Limit: No more than two occasions/nights per week, and no more than two drinks per occasion. Wine: Opt for natural wine (fully fermented, low to no residual sugar, lower ABV, mostly free from pesticides prevalent in conventional wine production). Our friends at Dry Farm Wines offer great options, and many stores now carry this type of wine. Reminder: most conventional wines contain sugar and pesticides, including many brands served at high-end restaurants and bars. Cocktails: Stick with Mezcal, Vodka, or clear Tequila. Avoid rums, bourbons, whiskeys, and other darker alcohols due to the additional toxins in them. Mix with club soda, water, or have your cocktail neat. Steer clear of fruity or sugary cocktails, as the sugar content can cause inflammation. Avoid beer if possible due to its carbs and gluten content. However, a dry, 0% residual sugar “keto” cider is an alternative. Regularly supplement with methylated B-vitamins (I take 2 of Parsley’s Daily Dose Multi daily), Alpha Lipoic Acid, NAC (N-Acetyl Cysteine is a glutathione precursor, and glutathione is our cells’ most powerful antioxidant), and milk thistle to support detoxification and liver protection. These are basic, tried and true options for antioxidant support. Additionally, consider a high-quality probiotic due to alcohol’s impact on the microbiome or consume more fermented foods. Pair drinking occasions with high-quality hydration support like Endura from Metagenics, which includes glutamine to help heal the gut lining. Swap alcohol for one of the many excellent non-alcoholic beverages on the market, ensuring the one you choose isn’t overloaded with sugar. Personally, I enjoy Kin Euphorics and Amass non-alcoholic vodka. Drink early and stop early. Allow your body time to metabolize alcohol before bedtime to achieve the lower resting heart rate and lower core body temperature required for deep sleep, which alcohol often interrupts. Avoid ibuprofen during or soon after drinking, as it exacerbates the impact on your liver and gut lining, which have already experienced a toxic hit. I hope this note equips you with the information and confidence to have a conversation about alcohol, both with yourself and with those you care about, in a positive and informed way. Wishing you a healthy, happy holiday season! *** Product Recommendations: Dry Farm Wines : Organic and sugar-free Parsley Daily Dose Multi : Supplemental vitamins and minerals Amass non alcoholic vodka : Premium non-alc botanics Kin Euphorics : Another refreshing non-alc option Keep Reading Are seed oils toxic to your health? My personal Thanksgiving menu Can processed & deli meats be healthy? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Neuroplasticity and the “New Year, New You” Craze
URL: https://www.robinberzinmd.com/neuroplasticity-and-new-years-habits/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: So what does it actually take to make a meaningful change in your life? Here’s what I’ve learned.
Hi everyone – Robin’s Short Version Don’t Wait for Symptoms: By the time symptoms appear, chronic illness is often harder to treat—early bloodwork enables prevention or reversal. Standard Labs Miss Key Markers: Fasting insulin, homocysteine, and hsCRP are routinely skipped but reveal metabolic and cardiovascular risk far earlier than basic panels. Numbers Need Context: Results must be interpreted alongside your health history and lifestyle by a doctor who understands your individual risk factors. Happy 2024! There’s something special about entering a new year. It might seem arbitrary to mark a new beginning on a calendar, but I find joy in the collective spirit of starting afresh. Life, after all, is a series of new beginnings. In my last newsletter, I delved into why we often fail at maintaining resolutions. This time, I’m focusing on strategies to make our goals more achievable, starting with a crucial step: bloodwork. Recently, a friend shared an Instagram post from a well-known fitness influencer who began the year with extensive health commitments, including a full range of medical tests. My friend wondered if this was over the top. My initial response was: if you have the resources, why not? Some of these tests listed actually could be excessive, and most will be out of pocket and pretty expensive. There is also the reality that there is a lot of unnecessary testing in the medical community that the American Board of Internal Medicine and others are rightly trying to dissuade (sadly, a lot of it is driven by providers fearing legal action if they don’t do “everything” even when not medically warranted.) But in a world where 60% of our workforce has a chronic condition, 30% have 2+ conditions, 50% of cancers are preventable, and younger and younger people are living with diabetes, obesity, inflammatory conditions infertility and GI issues, everyone should get bloodwork when it’s so widely available and the benefits are so widely established. These tests are vital for early detection of diseases. Often, waiting for symptoms to appear means facing more significant health challenges. Foundational blood tests are frequently overlooked, yet they are crucial. They can detect early problems, leading to impactful interventions, prevention, or even reversal of chronic illnesses, and in some cases, can be life-saving. Beginning the year with this data provides a baseline and measurable goals, fostering accountability and motivation through clear, quantifiable targets. However, merely getting tested isn’t enough. It’s equally important to consult a doctor who can interpret the results within the context of your personal health history and lifestyle. This January, I’m undergoing several tests. Most are part of Parsley’s standard annual bloodwork panel. I’ve also chosen additional tests to optimize specific health aspects, understanding my lifestyle’s risks and my health history. Having had three children in the past six years, I’m vigilant about monitoring for health issues I’ve previously faced and those I’m at risk for. My Personalized Parsley Baseline Labs: CBC – Red and white blood cell counts CMP (Comprehensive Metabolic Panel) includes electrolytes, kidney function and liver function, plus GGTP a measure of liver oxidative stress. Thyroid: TSH, Free T3, Free T4, (+ Thyroid autoimmune antibodies if you are a new and symptomatic) Key Nutrients: Vitamin D3 as Vitamin D, 0H-25, B12, Folate, Magnesium, Selenium, Zinc, Copper, Ferritin Blood Sugar: Hemoglobin A1C, and fasting Insulin Inflammation: hsCRP, ESR, homocysteine Toxins: Mercury, Lead Free and Total Testosterone, and DHEA-S: Because I am focused on building lean muscle mass this year! Note: I’m skipping estrogen and estrogen metabolites, and progesterone as I don’t have symptoms that I would act on using these numbers at the moment – and I test regularly – but at Parsley, we do test full hormones for those patients who have indications. Advanced Heart Health: Lipid Panel (Total cholesterol, LDL, HDL, Triglycerides) and Apo-B and Lpa. This panel will give me an overall picture of where I’m on track, where I’m at risk, where I’m off course, and where I have room to optimize. Reminder: having a normal result doesn’t mean you have an optimal result! I’ll share my results when they are back and what I’m doing to move the numbers. Knowing your stats is a very compelling way to maintain a resolution. At the end of the day, we all need a way to track progress. Without the data, especially when it comes to our health, we tend to drift. *** Product Recommendations: I’ve been taking Host Defense Lions Mane Mushroom supplements regularly for focus and cognitive function. I was taking them at night but experimented in the morning and I’ve noticed enhanced daytime clarity. I have been loving Endura from Metagenics for overall hydration, clarity and a reboot the morning after having a glass of wine (which disrupts my sleep every time). What’s New at Parsley: If you’re thinking about resolutions and testing, Parsley can help. Use my code RBMD50BACK on sign up for $50 back after your first medical visit!. Note that this code can’t be combined with other offers. ‘Til next time, RBMD Keep Reading How to Slow Brain Aging Starting in Your 40s The best diet for brain health? The best “calm tech” to hack your vagus nerve Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to prevent cancer at younger ages
URL: https://www.robinberzinmd.com/how-to-prevent-cancer-at-younger-ages/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: The alarming rise of cancer rates in younger populations is occupying a lot of space in my head these days. Today, I talk about why that is, what we can do
Hi everyone – Robin’s Short Version Prediabetes Raises Risk: Nearly 40% of U.S. adults have prediabetes, which raises cancer risk by 10% and cancer death risk by 14%. Ultraprocessed Foods Matter: Every 10% rise in ultraprocessed food consumption increases both cancer rates and cancer deaths, per a 2023 Lancet study. Cancer Is Preventable: Up to 50% of cancers are preventable, with diet, inactivity, and metabolic disease alone driving 42% of all cases. The alarming rise of cancer rates in younger populations is occupying a lot of space in my head these days. Today, I talk about why that is, what we can do to prevent it and how to reverse course. The Wall Street Journal reported last week that in the US, despite an overall decrease in cancer deaths—primarily due to reduced lung cancer rates from lower smoking rates—other cancer types like colorectal, breast, and melanoma are increasingly affecting those under 50 . The American Cancer Society notes a particular increase in colorectal cancer in people born after 1950, with 20% of cases now diagnosed under 50, up from 11% in the 1990s. A report from the British Medical Journal last fall revealed a stark reality: a 79.1% increase in early-onset cancers (diagnosed before age 50) and nearly a 30% rise in related deaths from 1990 to 2019. My journey into medicine began with my grandmother, who died unnecessarily young from colon cancer. This could have been prevented but she lacked good primary care and didn’t get a screening in time. She also smoked cigarettes and ate the Standard American Diet (also known as the SAD) for many years — two of the top risk factors for cancer. Despite the National Cancer Institute’s assertion that nearly 50% of cancers are preventable, it’s clear that over 20 years after her death, we are heading in the wrong direction. So, why are more young people getting cancer? Authorities often claim ignorance, which is a little bit like watching a car crash happen and then throwing up your hands and saying you don’t know how the car got totaled. While certain variables contributing to higher cancer rates in specific groups remain elusive, the overarching risk factors are evident. The car crash keeps happening right in front of us. The American Cancer Society attributes 42% of cancers to factors like diet , toxin exposure (including tobacco), lack of physical activity, and conditions such as diabetes and obesity. If you look at the trend lines, the percentage of people who are diabetic, have metabolic syndrome (i.e. pre-diabetes) and are sedentary have gone up dramatically for the last 50 years. From my perspective and from what we see at Parsley, this is all preventable, or “adjustable”. The factors increasing cancer rates are everywhere and easy to spot. Most importantly, we can change this trend if we act on the knowledge we already have. Here are my top 4 preventable cancer risk factors. Nothing is perfect, but I’ll take really good over perfect when it comes to cancer any day if perfect doesn’t exist: Sugar Consumption, Diabetes, and Metabolic Syndrome: The higher risk of cancer and death from cancer in patients with diabetes and pre-diabetes is well established . Per a paper in Nature from 2020 , diabetics have a 10% higher chance of cancer risk across the board and a 14% higher risk of death from cancer. In the past 100 years, sugar consumption has more than doubled, with the average person consuming 60lbs of added sugars per year , and much more than that in total sugar. With rising sugar consumption causing insulin resistance , the precursor to diabetes, the incidence of diabetes has increased in parallel. Now, nearly 40% of US adults have prediabetes; that’s almost 100M people ! Ultra Refined Diets (URDs): These are diets lacking fiber, whole plant sources of antioxidants and healthy fats. A 2023 paper in the Lancet showed that for every 10% increase in the consumption of ultraprocessed foods, overall cancer rates and death from cancer increased. Today 73% of our food supply is considered ultraprocessed . Lack of Exercise: Exercise is associated with lower overall cancer risk , per the American Cancer Society. While the studies make it hard to tease out the impact of exercise alone, controlling for reductions in obesity and blood sugar, the fact remains that too few people avail themselves to regular, vigorous exercise. Per JAMA, the average adult sits around 8 hours per day , starting in their teenage years. Additionally, with the rise in “white collar” work, sedentary jobs have increased 83% since 1950. Alcohol and Tobacco: Here is where you will find the best established links. Any level of alcohol consumption increases cancer risk , and the data reveals an exponential increase in risk occurring for moderate and high levels of drinking vs those with low alcohol consumption. The same is true of tobacco use: the reduction in tobacco use over the past 50 years is the number one reason lung cancer rates have declined by over 30%. Other factors that might contribute to cancer, though less understood, include plastics, aspartame, and other food supply toxins; microbiome disruption from antibiotics, medications, and refined foods; and impaired immune systems due to high sugar diets, food allergens, chronic stress, and intestinal permeability. While some factors remain unidentified or unquantified, I strongly advise focusing on controllable elements, specifically numbers 1-4 above. Additionally, regular screening is crucial: mammograms at age 40, colonoscopies at 45, PSA tests at 55 (or 40 for men with a family history or who are African American), and pap smears for women starting at age 21. At Parsley, we order and review all these tests for our patients. For those willing to go the extra mile, consider these options: Cologuard Non-Invasive Colon Cancer Screening: Given my family history I did this at age 41 and paid out of pocket (the cost was $650) because I was too young to qualify for coverage. I have patients who refuse to do a colonoscopy – even though they are over 45 – and having this as an option that detects 99% of cancers is an amazing backup. That said, I highly recommend colonoscopy. Full Body MRI: At $2500+ this is expensive though increasingly available. I’ll discuss the pros and cons in more detail in an upcoming post. Galleri Blood-Based Cancer Screening: This is effective for a variety of cancer markers, available through Parsley Health and costs $500+ depending on the array of markers. I hope you leave this feeling deeply inspired to prevent cancer. What is the first thing you are going to change? Tell me on IG . *** What’s New at Parsley: If you’re thinking about resolutions and testing, Parsley can help. Use my code RBMD50BACK on sign up for $50 back after your first medical visit!. Note that this code can’t be combined with other offers. ‘Til next time, RBMD Keep Reading Your comprehensive preventative health checklist. 100 Essential Labs Every Woman Should Be Tracking My cervical cancer scare Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Should you get a full body MRI?
URL: https://www.robinberzinmd.com/is-getting-an-elective-mri-worth-it/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Ever since I mentioned my MRI experience on Instagram, people have been asking if it’s worth it. My answer is that it’s a highly personal decision. It de
Hi there, Robin’s Short Version Real Detection Works: A nonsmoking patient caught localized lung cancer with zero symptoms via elective MRI and had it successfully removed. Cost in Context: At $2,500, a full-body MRI is cheaper than treating advanced cancer and comparable in cost to a standard colonoscopy. Incidentaloma Debate: Critics warn of unnecessary follow-ups from minor findings, but Dr. Berzin argues early detection saves more than it costs. Prevention is everything when it comes to health, which is why I got a full body MRI with Ezra last week, one of the many companies offering elective MRI’s direct-to-consumer that you may have seen peppering your social media feed . I was proud of myself for doing it. As someone with claustrophobia, I wasn’t sure if I could handle 45 minutes in a clacking and clonking metal tube. When I got there, I informed the tech that there was only a 10% chance I’d make it through the MRI without issue. I requested updates every 5 minutes on how much time was left to avoid panicking. Despite having Xanax with me, I chose not to take it. It was 9am, and I had to be fully alert for work afterward. Additionally, this medication sometimes paradoxically heightens my anxiety, a risk I wasn’t willing to take. Still, I completed the MRI from start to finish without any breaks and am glad for it. Is Getting An Elective MRI Worth It? Ever since I mentioned my MRI experience on Instagram, people have been asking if it’s worth it. My answer is that it’s a highly personal decision. It depends on your willingness to undergo an optional medical procedure, your sensitivity to the costs involved, and your emotional capacity to deal with potentially adverse findings. For instance, how would you feel if you discovered you needed brain surgery for an aneurysm or had cancer? For some of my patients, the psychological burden of such information is overwhelming, leading them to prefer avoiding the risk of lifelong medical surveillance and the associated continuous testing. In my case, I prefer having the data to proactively manage my health. As a mother of three, I’d rather know and confront any issue head-on. One of my patients, who got an MRI through Prenuvo, another direct-to-consumer MRI company, discovered she had lung cancer despite being a nonsmoker. Fortunately, it was localized, and she had it successfully removed. She, and I, are grateful for the early detection. What Does The Medical Community Think of Elective MRIs? The medical community’s views on elective MRIs are divided. The prevailing opinion is that they are financially wasteful and often lead to the discovery of insignificant ‘incidentalomas’ – minor anomalies that could result in unnecessary further investigations and expenses. There’s also a concern about the medical system’s hypervigilance in avoiding unnecessary tests, which can drive up healthcare costs. My Take I believe that the issue lies in the over-testing of sick patients, driven by a highly litigious society that pressures doctors and health systems to avoid lawsuits. This leads to exorbitant costs, especially in hospital settings. Stronger controls and legal protections are needed to mitigate this issue. However, we shouldn’t allow the problem of over-testing in medical settings to discourage proactive, preventive screenings. Early disease detection, before symptoms appear, is less costly to treat. Most blood tests are inexpensive to conduct; it’s the lab charges to insurance companies that are high. Even more expensive tests, like a full-body MRI starting at $2,500, or the Grail liquid cancer biopsy at $950, are considerably cheaper than treating advanced cancer. It’s puzzling to argue against tests like MRIs and Grail when expensive, invasive screenings like colonoscopies are considered valuable for their life-saving potential. While colonoscopies have established evidence supporting their effectiveness, elective MRIs and Grail are in their early stages. Without conducting these tests, we can’t build the evidence to determine their value or identify when they shouldn’t be used. As demand increases, costs decrease. DNA sequencing once cost $100,000; now, it’s under $100, and companies like Ancestry and 23&Me offer it for less than $200. Many services start as luxuries but become accessible to all over time. This was my inspiration for Parsley – to make root cause medicine, once a luxury, affordable for everyone. In the next decade or two, MRIs and liquid biopsies, along with other screening technologies, will become cheaper, faster, more accurate with AI diagnostics, and widely available. Therefore, I believe the medical community should quickly establish standard protocols for recommending these tests and interpreting their results. So What Did I Learn From My MRI? My notable results: Confirmed I have an angiomyolipoma, a benign tumor, on one of my kidneys, which I knew about. Turned up a 4mm thyroid nodule, flagging it as a cancer risk. My next steps: I test my thyroid levels every year (my results are currently pending) and have never had any antibodies to my thyroid or levels that are off, so I have never had a reason to get a thyroid ultrasound. A 4 millimeter nodule is tiny, and likely to be benign. In addition as many as one in 3 people have a papillary thyroid cancer that they walk around with unknowing, that never causes problems. But from here I’ve referred myself for a biopsy (perk of being a doctor!) and if I were someone other than me I’d go to my PCP to refer me. I’ll get a repeat scan (likely ultrasound next time) to monitor my kidneys every couple of years, as in very rare instances these types of benign angiomyolipomas transform into cancer. Will I Get Another MRI? Yes, probably in 5 years, but I don’t feel the need to do it any time soon. If you’re interested in an MRI use the code PARSLEY200 for $200 off with Ezra . I have no formal affiliation with this company, but the company was kind enough to offer me the MRI for free to give them feedback on the experience. The Difference Between Ezra and Prenuvo As far as the difference between Ezra and Prenuvo, amongst others, fundamentally they are using the same technology and offering the same service. Ezra has some cheaper options, and explained to me that its AI algorithm may lead to more accurate diagnoses. Personally, I believe that market success in this category will ultimately depend on the quality of the experience. You can expect that more than one company will develop AI-based algorithms to make the scans more accurate, and most of these will become open-sourced as the medical community adopts the technology as a best practice. I do hope we are on a path to a faster, stand-up, less loud and clunky (and less claustrophobic!) experience for all. When we get there — imagine zipping in, standing up for a 2 min MRI much like at the airport security machines — we will have actually democratized this service for all, and we won’t be putting such a hefty price on prevention. Keep Reading Full-Body MRI: Is a $2,500 Scan Worth It? Is it worth $2,500 to catch disease before it starts? 100 Essential Labs Every Woman Should Be Tracking Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## It’s raining men(opause)
URL: https://www.robinberzinmd.com/its-raining-menopause/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: Hi everyone, Menopause is a hot topic lately, with Oprah hosting town halls with celebrities on the topic in addition to a slew of new menopause startups h
Hi everyone, Robin’s Short Version WHI Misread: Estrogen-only users had 40% lower overall mortality, with no increased breast cancer deaths despite widespread fear. Start Timing Matters: HRT begun within 10 years of menopause appears protective against dementia; waiting until age 76 may raise risk instead. Stigma Has Lifted: Patients now arrive informed, asking detailed questions about bioidenticals and testosterone rather than approaching HRT with fear or guilt. Menopause is a hot topic lately, with Oprah hosting town halls with celebrities on the topic in addition to a slew of new menopause startups having just raised $530M in the past few years. Andropause isn’t far behind – testosterone startups like Hone Health, Ro and others are also on the rise, lifted by the tailwinds of consumer trends in longevity and performance thanks to doctors like Attia and Huberman. At Parsley, where we have been prescribing hormone replacement therapy (HRT) to men and women since 2016, we are seeing more demand for hormones than ever. I prescribed HRT twice last week to two female patients now in menopause, both 51 – the age at which menopause starts on average in the US – and found myself having a much different conversation with them than when I first saw them eight years ago. Not only were both inquiring about starting hormone therapy, both had researched their options, had detailed questions on the merits of bioidenticals vs synthetic, whether estriol was needed alongside estrogen or not, and whether they should start testosterone too. They sounded… excited. I thought to myself, wow, the stigma is gone. Eight years ago my patients approached HRT with trepidation, fear, and what felt like a level of guilt, as though they were considering risking their lives for the sake of managing a few pesky hot flashes and night sweats. Thankfully, no more. That mindset is outdated. HRT, it turns out, is highly beneficial not just for managing symptoms, but potentially for preventing chronic disease . The three myths of HRT in women: Myth 1: HRT causes breast cancer. This is not true. In fact the Women’s Health Initiative (WHI) study in 2002, which originally caused all the controversy, actually showed lower all-cause mortality in those who started estrogen in mid-life, mean age 47. The study did show a very slight increase in the incidence of breast cancer (1 additional case per 1000 women) in a group of women who had used HRT before the study in addition to during the study, but no increased incidence in another group of women who had not used prior HRT. Furthermore, the study, which followed women for 20 years, showed no increased breast cancer mortality from taking HRT. In fact, the group that took estrogen only (as opposed to estrogen + a synthetic form of progesterone no longer in use called MPA) had a 40% lower overall mortality than the other group . The TLDR here is that the study doesn’t link estrogen replacement to breast cancer, and that if anything it could be protective, and yet this message was picked up by the press and led to decades of underprescribing HRT to millions who could have benefitted from it. There is a lot more here to dive into – the ways in which HRT has evolved over time much like the birth control pill, and the fact that the research seems to show that starting HRT over 10 years after menopause does seem to increase risk while not providing any benefit. But we can go deeper in another post. Myth 2: HRT causes increased risk of dementia. In fact, the opposite is true, when taken in mid-life (mean age 47) around the time of menopause, HRT has a protective effect . Per one large study, risk was only higher in a group that did not take HRT around menopause but started estrogen later in life (mean age 76). The conclusion here is, again, that starting HRT later in life (greater than 10 years post menopause), may have greater risk. But the risk for those who started in mid-life and continued was equivalent to those who started in mid-life and stopped. Myth 3. HRT causes heart disease. This is also not true. An analysis done later of the women’s health data showed that for those starting HRT within 10 years of menopause, HRT may have been protective against heart disease; for those starting between 10 years and 20 years out from menopause, HRT was neutral to cardiovascular outcomes and for those starting 20 years post menopause, it was associated with slightly worse cardiovascular outcomes. In addition the form of estrogen studied was CEE, an oral estrogen that was associated with slightly higher blood thickness and therefore clot risk, but this form of estrogen is no longer used. At Parsley we prescribe transdermal estrogen in newer forms which have not been shown to have any clot risk. What is not known is if HRT is truly protective for heart disease: some research is positive, some is ambiguous. We know more research is needed, but we can say that HRT does not independently worsen risk of heart disease absent other factors. Lastly, HRT has been shown to be protective against osteoporosis. When estrogen drops off in menopause, bone density drops off too. Taking estrogen plus progesterone has been shown to preserve bone density, though the impact fades as soon as you stop taking hormones. Who should not take HRT? For women: According to ACOG (The American College of Obstetrics and Gynecologists), anyone who has a history of breast cancer or endometrial cancer, a history of blood clots or stroke, or liver disease, should not take HRT. For men: Testosterone therapy that starts too early can lead to infertility; plus, there is mixed research on testosterone’s impact on heart disease. In all cases, HRT should be monitored through regular testing and visits with your HRT-literate provider who can monitor for side effects, overall levels and order preventive screening as necessary. How long can you take HRT? The simple answer is we don’t know. Longitudinal trials of HRT, including bioidentical HRT, which means hormones sourced from animals that more closely mimic human hormones, vs the synthetic hormones that have been used in studies, may not be done any time soon. We simply don’t have sufficient data on what it means to start hormones in mid-life and continue them for 30+ years. As a result, ACOG recommends stopping HRT once symptoms of menopause have subsided. But I have to wonder if this recommendation is dated too? With all the preventive benefits of hormones, in 5 or 10 years will we be recommending everyone take them for decades? It’s definitely possible. What we do know however is that per the data we have, starting HRT late in life, more than 10 years after menopause, seems to come with slightly increased risks of dementia, heart disease and breast cancer, while starting in mid-life appears to be neutral to beneficial. We also know that surveillance and screening while on HRT is important. At Parsley, we monitor heart health through tests like hsCrp, ApoB, Lpa, and homocysteine. We also encourage regular mammogram and self breast exams (on or off of HRT) and paying attention to symptoms; for example, ongoing spotting in a postmenopausal woman can be a side-effect of improperly titrated HRT, but can also be a sign of endometrial cancer. If it were me? I always get asked, what will I do in the future when it comes to hormones? Of course, something could change in the data or my own health to change this, but as of today, based on what we know, I will likely plan to take HRT proactively. I most likely will take either compounded bioidentical estrogen cream (my preference) or a synthetic estrogen patch, oral progesterone, and if my natural testosterone levels fall, I will consider testosterone replacement too. By the way, for a future post, some women maintain their testosterone levels post-menopause, and when I see this I don’t replace it because it’s there and not missing! *** Get a free Functional Symptom Score . How do you feel today? Everyone has something going on, even the healthiest among us. And symptoms are messages from our bodies telling us what’s going on under the surface. At Parsley Health we offer a free Functional Symptom Score so you can start measuring how you feel across nine body domains including gastrointestinal, mood and heart health. This is a published and literature-validated score that gives you real insight into what your symptoms could mean! Keep Reading Is estrogen the ultimate longevity drug? Brain, bones, booty: 3 things to take care of before you reach menopause. Your bone density blueprint. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to achieve optimal hormone balance, regardless of age
URL: https://www.robinberzinmd.com/how-to-achieve-optimal-hormone-balance/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: A lot of you reached out and asked questions like, “Ok, HRT sounds promising, but what if I want to maximize my own hormones? Is there anything I can do to
Hi everyone – Robin’s Short Version Test Early: Low testosterone at 30 won’t resolve on its own, but targeted action after a full hormone panel can reverse the trend. Fat Is Essential: Sex hormones are synthesized directly from cholesterol, making healthy dietary fats a biological requirement for hormone production. Hormones Cascade: Elevated cortisol from adrenal stress can disrupt estrogen, progesterone, and testosterone levels throughout the entire hormonal network. It’s spring, and hormones are in the air in all the ways. This week I’m headed to the annual SXSW conference in Austin to speak at a couple of events, including one on AI and Women’s Health, and one on how to optimize hormones called Your Hormones Are In Your Hands 😀 And after my last newsletter a lot of you reached out and asked questions like, “Ok, HRT sounds promising, but what if I want to maximize my own hormones? Is there anything I can do to juice my estrogen, testosterone and progesterone now? Can I avoid the symptoms of menopause and andropause all together? What do I do to keep the juices flowing?” So inspired by the above, today we are talking about what it takes to have optimal hormone health naturally, right now. It’s a topic that’s highly personal to me. I’m 42, my youngest baby turned two last fall, and it’s honestly hard to believe, but I have officially put my years of focusing on fertility optimization in the rear view, and now I’m focused on slowing the aging process, and optimizing my own hormonal balance. I know that I can – and will – go into my 50s with maximum vitality using every tool I have studied and prescribed for a decade. This includes ensuring that I maintain balanced, healthy sex hormones, thyroid hormones and adrenal hormones now, so that I glide into menopause in 10ish years like it’s Not. A.Thing. So here is your cheat sheet, which requires starting with a little Biology 101. Hormones are chemical messengers and each day your body manufactures hormones and breaks them down (aka “metabolizes” them) and excretes them. Sex hormones typically decline with age, with estrogen and progesterone declining for women after 50 and testosterone slowly drifting down with age for everyone – unless you intervene. Hormones are made from cholesterol, which is one reason you need healthy fats, and why the “avoid fat at all costs” mantra of the 90’s was so off-base. Every cell in your body has receptors for your hormones. The hormone locks into the receptor, acts like a key to open a door, and kicks off a cascade of signals through the cell leading to the cell changing behavior in a multitude of ways, including synthesizing new proteins and displaying new receptors. Hormones are all connected and influenced by one another: Cortisol, DHEA, and the neurotransmitters norepinephrine and epinephrine are from your adrenals; free T4 and free T3 come from the thyroid; and Estrogen, Progesterone, and Testosterone come mostly from the ovaries or testicles, respectively, but also are made in the adrenals. Additionally, fat tissue also produces estrogen. These hormones work in concert, where higher levels of one can drive lower or higher levels of the other. So how do you tap into this beautiful dance and create the conditions for healthy hormone production and sustained hormone longevity? The following applies to hormones if you’re 18, 38, 58 or 68… and beyond. Start with testing, and know where you are. Are you 30 and your testosterone is already low? It’s not going to magically get better, but it can get better if you act now. The Parsley Health Baseline Male and Female Hormones panel looks at estrogen (total estrogens and estrogen metabolites like estradiol and estrone), progesterone, DHEA-S, a core adrenal hormone which is a testosterone precursor, and free and total testosterone along with SHBG (sex hormone binding globulin) which is the school bus that ferries your sex hormones around your body, and DHT (di-hydrotestosterone) the testosterone metabolite which is known for male pattern baldness. The Parsley Baseline panel also evaluates thyroid function for men and women, including TSH, Free T4, Free T3 and key nutrients that support thyroid health like Zinc, Selenium, Iron and Vitamin D3. To evaluate Cortisol, we use at home test kits that look at either salivary or urinary Cortisol patterns over the course of the day and tell us if your pattern is optimal, or indicative of Adrenal Fatigue. Once you know where you stand, and you’ve determined that you want to optimize, I recommend starting with the following: For Everyone: 1) Actively Build Long Term Testosterone through Body Composition and Blood Sugar Balance. Interestingly, research shows that exercise in the form of resistance (weight) training and high intensity exercise increases testosterone levels in the short term (i.e in the hour after exercise) but not long term as a stand-alone intervention. However one’s body composition, specifically lower overall fat mass, is associated with higher long term testosterone levels, while obesity is associated with lower testosterone levels. A recent 2023 study of 163,000 men in the UK evaluated 13 variables associated with lower vs higher testosterone and showed that lower adipose mass (fat tissue) was most correlated with higher testosterone levels. (Personally I would love to see a similar analysis of women – women’s health tends to be left behind in the research). Regardless of biological sex, if you live a relatively sedentary lifestyle, that will yield a body composition with greater fat mass and reduce your testosterone production over the long haul. Testosterone is key to being able to build more lean muscle mass so it can be a slippery slope or a virtuous cycle. High sugar diets and sedentary lifestyles are the biggest culprits I see leading to younger people having low T. My body composition prescription: HIIT (High intensity interval training) 10-30 min, 1-2x weekly. My fav online HIIT is from Rocamoons . Weight training 2-3X weekly. 15-30 min. Body weight is not enough. Use weights or resistance bands. Yoga/activity that stretches and stimulates the fascia (connective tissue) 1-2x weekly, improving hyaluronic acid production and joint flexibility. Eat adequate protein. To build muscle you need 1 gram per pound of body weight per day. So if you’re 150bls, yes that is 150 grams of protein daily. It can be hard to do but it’s key for building muscle and bone. This combination will help build muscle, improve skeletal health, and stimulate connective tissue health, and in turn improve resting metabolism and insulin sensitivity, improving overall blood sugar balance. This matters even if you’re not overweight. 2) Fully Metabolize Your Estrogens For men and women, the MTHFR and COMT enzymes are critical for healthy estrogen metabolism, breakdown and excretion, so supporting this process with methylated cobalamin (ie Methylated B12) and 5-MTHF (ie methylated folate) helps ensure your enzymes have the co-factors they need for estrogen metabolite break down and disposal. Foods like cruciferous vegetables (broccoli, brussels sprouts), dark purple/red berries (blueberries, acai), and flax seeds to name a few also support heal thy estrogen metabolism. I recommend taking Parsley’s Daily Dose Multi or a similar methylated multi daily made by a professional grade, GMP certified manufacturer. 3) Use Targeted Supplements Based on your Test Results. There are thousands of internet sites that will promise the moon and the stars when it comes to hormones, and because supplements are not regulated in the same way as drugs, the claims out there get fuzzy. If it sounds too good to be true, it’s marketing;-) That said, here are some supplements I like and use routinely to support hormones: Testosterone: Start with adrenal support through a supplement like HPA Adapt by Integrative Therapeutics, an adaptogenic blend that supports adrenal balance. This includes Maca which by the way has been shown to improve libido but not necessarily change testosterone levels . Progesterone: Vitex, AKA Chaste Tree Berry, can support progesterone balance in premenopausal and perimenopausal women. Estrogen metabolism: Meta-I3C by Metagenics, DIM Detox by Pure Encapsulations or similar product with indol-3-carbinol as the active ingredient can help the body break down and dispose of excess estrogens. Resveratrol, Magnesium Glycinate and N-Acetyl Cysteine all support COMT enzyme activity and overall detoxification processes. For Women: 4) Rest and De-Stress your Way to Healthier Progesterone Levels Through Cortisol. Chronically high cortisol levels due to chronic stress create a phenomenon called “cortisol steal” which depletes progesterone by speeding up the pathway that converts progesterone to cortisol . Low progesterone levels are associated with irregular periods, impaired fertility and PMS, as well as worse menopause symptoms. Perpetually high cortisol also increases blood sugar, which in turn increases insulin, which leads to poor blood sugar balance over time. How: Spend 1 hour daily, awake, in a rested state. This could be through meditation, gentle yoga, breathwork, a bath, cooking, walking or Tai Chi/Chi Gong or other practices. This means you are awake, relaxed, and out of fight or flight. I’d love to hear your stories of implementing my prescription above. One of my patients recently celebrated having optimal testosterone levels after years of seeing levels sub par. How did he do it? He cut out alcohol and refined carbs and started working out with a trainer and lost 40lbs while increasing muscle mass. The impact on resting testosterone was to nearly double his total and 3X his free testosterone. Have you implemented any of the above and seen better hormone balance based on symptoms or tests? Which supplements have you seen have the biggest impact? I’d love to hear your stories. RBMD *** Get a Free Functional Symptom Score How do you feel today? Everyone has something going on, even the healthiest among us. And symptoms are messages from our bodies telling us what’s going on under the surface. At Parsley Health we offer a free Functional Symptom Score so you can start measuring how you feel across nine body domains including gastrointestinal, mood and heart health. This is a published and literature-validated score that gives you real insight into what your symptoms could mean! Keep Reading Is estrogen the ultimate longevity drug? Testosterone Therapy Is Trending—But Is It Right For You? It’s raining men(opause) Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Should we put statins in the water?
URL: https://www.robinberzinmd.com/should-we-put-statins-in-the-water/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Here’s what I’m advising my patients on statins — and why. The evidence is more nuanced than your cardiologist may have suggested, especially for women.
Recently, I ran into my friend from medical school who is a prominent doctor. He said he believes statins should be prescribed en masse, for every American adult. Basically, “put it in the water” he said. My friend looked at me and said, do you agree? I am asked this question by patients all the time. Some of those patients I would consider to be extremely healthy. Here’s what I’m advising them – and why. I’ve also asked myself this question, so skip to the bottom for an insight into whether I’d personally take statins. Robin’s Short Version Particle Size Matters: Small, BB-like LDL particles crack artery walls and trigger plaque buildup; large, fluffy ones cause far less damage. Track ApoB: Total cholesterol misses the full picture — aim for an ApoB of 80 mg/dL or less to accurately gauge your heart disease risk. Test Blood Sugar Fully: Check fasting glucose, fasting insulin, and HgBA1C together, since 80% of the 98 million Americans with prediabetes don’t know they have it. The research says: Over 86 million American adults have sub-optimal cholesterol , with 10% having high cholesterol as defined as 240 mg/dL per the CDC, and heart disease is the number one killer in America, with nearly 700,000 people dying each year – or 1 in 5 deaths – and over 800,000 people each year have had a heart attack. The optimal cholesterol for a non-diabetic is less than 200 mg/dl total cholesterol, with the optimal for the most important measure of cholesterol for heart disease risk, ApoB, being 80 mg/dl or less. I will use ApoB throughout this post, so don’t forget that it refers to the most important measure of cholesterol for heart disease risk. Blood sugar is also a primary driver of cardiovascular risk. More than 98 million Americans have prediabetes, and 80% of them don’t know it. Almost 12% of Americans – about 35M people – have progressed to diabetes. Hot tip: Test fasting glucose, fasting insulin, and HgBA1C to assess blood sugar, not HgBA1C alone. So what are statins? Statins are cholesterol-lowering medications that have been around since 1987. Their primary mechanism of action is as an HMG-CoA reductase inhibitor – they block the enzyme that makes cholesterol in the liver. They do not stop or lower absorption of cholesterol from the GI tract however – drugs called fibrates, supplements like plant sterols or fiber supplements, and improving your diet with lots of leafy greens and fibrous vegetables, can do that. Side effects of a statin can be muscle pain and for a small percentage of people, worse insulin resistance. How does cholesterol play a role? Firstly, cholesterol isn’t “bad.” The body makes cholesterol for several reasons – it is essential to the structure of every single one of our cells, and it’s the core building block for our steroid hormones (cortisol, estrogen, testosterone, and progesterone to name some examples) and it’s in and of itself an antioxidant – it helps soak up inflammation. TLDR: you need cholesterol to exist and function as a human. That is why the medical community has made total cholesterol our primary culprit. This is not correct. Here’s why. We need cholesterol With a nuance – it’s less about the volume of total cholesterol that matters and more the size and shape, plus the environment in which it’s working. Heart disease forms when lots of small, BB-like particles of LDL (which stands for low-density lipoprotein) bounce off the artery walls creating cracks in the plaster that the immune system shows up to repair and patch. If this happens over and over again, the build-up of immune cells under the arterial lining forms hardened plaques that push inward over time, squeezing off the arteries in the heart and neck, leading to reduced blood flow and eventually heart attacks and strokes, when blood flow is completely occluded, and the downstream muscle or brain dies. But imagine if you have big fluffy beach ball-like LDLs, bouncing off the artery walls and not doing damage. Well, you probably won’t develop heart disease. By the way, if you do develop these plaques, they can also go away. Research shows, this is what’s best for your heart health: A majority plant-based diet Exercise Stress reduction Avoiding tobacco Sorry, carnivores! The root cause of why those LDLs are high matters. Is it coming from your diet? Or are you producing too much cholesterol in the liver as a response to inflammation? Is it genetic? And is your body responsive to an intervention other than a statin, or not? And will your overall health and well-being be better if you reduce cholesterol through diet and exercise vs taking a drug? Does one drug just lead to another? These are all questions I ask my patients. What I recommend doing about cholesterol and when I recommend a statin. My approach with my patients at Parsley can be summarized in 5 simple steps – it’s only in the last step that I’d prescribe a statin: Test robustly: Run an NMR lipid profile with sub-particle fractionation including but not limited to Total Cholesterol, LDL-P, HDL-P, ApoB, Lpa, Triglycerides, measures of inflammation including hscrp, homocysteine, and blood sugar markers HgBA1C, fasting glucose, and fasting insulin. Also measure biometrics including blood pressure, weight, BMI, and waist-to-hip ratio. Assess the impact of blood sugar, diet, exercise, inflammation, hormones, and genetics on current cholesterol status. Assess if there is current heart disease or if we are preventing future heart disease. Blood markers can give an indication, but a calcium score (a CT scan of the heart that looks for present heart disease) is the best measure. Implement a plan to get cholesterol to optimal ranges with diet and exercise if possible, and if that’s not moving the needle, add proven supplements. If that doesn’t work, flip to a statin. When I prescribe this plan to my patients, I know that one of three things is likely going to happen. The patient tries but can’t implement these diet and lifestyle changes either because they don’t want to, or it’s just too hard in a modern lifestyle with restaurants, travel, and work to eat and exercise in the way that will have an impact. In that case, I’d start a statin. They implement the changes fully and they move the needle but not all the way to their goal. We start a statin in patients with evidence of heart disease on calcium score, or who are over 40 years old and want to prevent heart disease. In that case, I’d start a statin . They implement them and they work beautifully, and they feel so good with greater energy and mood, better digestion and skin, that they are set. In that case, we do not start a statin , but we monitor a full cardiometabolic health panel every year. Of course, I want my patients to succeed without medication. And that is always what we will try to do first. But as doctors, we also have to recognize that sometimes we do need to rely on the medication option as a supplement to other lifestyle changes that can be introduced at the same time. What would I do for myself: I’m prescribing statins more than ever and I’m open to taking one myself. That said, I plan to never need it because of my lifestyle. It’s not easy between three kids and a full-time job. But I do know that exercise and a healthy diet can do more than a statin can ever do. That gives me energy, clarity, and vibrance while slowing the aging process. I’ll take that over a pill, any day. Take care of yourself, Robin Berzin MD Get a free Functional Symptom Score How do you feel today? Everyone has something going on, even the healthiest among us. And symptoms are messages from our bodies telling us what’s going on under the surface. At Parsley Health we offer a free Functional Symptom Score so you can start measuring how you feel across nine body domains including gastrointestinal, mood, and heart health. This is a published and literature-validated score that gives you a real insight into what your symptoms could mean! Keep Reading How Do You Actually Know Your Heart Is Healthy? 100 Essential Labs Every Woman Should Be Tracking My personal lab test results—and what I’m doing about it… Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My personal lab test results—and what I’m doing about it…
URL: https://www.robinberzinmd.com/my-personal-lab-test-results-and-what-im-doing-about-it/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Back in January I shared the list of blood tests I’d be running on myself to support my prevention and longevity goals. Then I got sidetracked with topics
Back in January I shared the list of blood tests I’d be running on myself to support my prevention and longevity goals. Then I got sidetracked with topics I really wanted to write about sooner—like statins and hormones—but I did do my bloodwork as promised. (FYI, if you’re also strapped for time, Quest has a great at-home blood draw service for $55 I recommend.) I’m excited to finally share some of my results with you. The research says: It’s estimated that less than 10 percent of Americans undergo preventative healthcare screenings, including blood tests. To me this is one of the most problematic stats there is when it comes to public health. Robin’s Short Version Prevention Is Rare: Less than 10% of Americans get preventive screenings, yet most fatal diseases develop silently over decades. Early Detection Matters: Diabetes can be fully reversed if caught early through bloodwork, but symptoms only appear once it’s advanced. Normal Isn’t Enough: Even solid lab results can hide gaps—Robin’s own tests at 42 revealed deficits in muscle mass, protein, and testosterone. Here’s why: cancer is on the rise in younger people, over 30% of Americans live with metabolic syndrome , 12% have diabetes , and nearly half (48.6%) of people have some form of heart disease . Lifestyle factors can help prevent these outcomes—if we catch signs of the disease early. Considering ultra-processed foods make up nearly 60% of our diets and most adults don’t meet the minimum physical activity guidelines (less than half get enough cardio and less than a quarter meet the minimum threshold for strength training, according to the CDC ), understanding your baseline health through preventative screenings can be a game changer. Many patients and friends I talk to today want more testing. Thanks to podcasts from biohackers like Peter Attia and Max Lugavere, services like Everlywell and Function Health offering cash pay labs, and direct to consumer MRIs marketed by celebrities including Kim Kardashian, there is a growing appetite for more data in our hands. I personally think the number of Americans undergoing preventative healthcare screenings each year should be 90% or higher. At the same time, there’s been a backlash against doing preventative testing—or even getting an annual physical—in recent years. Only 1 out of every 5 visits to the doctor is focused on preventative care and less than a quarter include lab tests, according to the CDC . Cost and time are real barriers to getting a check-up—I get it—but so is the hesitation to know what’s going on under the surface. Just because you don’t test, doesn’t mean there’s no reason to. The diseases that are killing us at the highest rates—heart disease, diabetes, dementia, and cancer, the “Big 4”—are all highly modifiable or reversible diseases that develop slowly over years if not decades. These diseases are far more likely to kill you if you’re symptomatic by the time you discover them. Diabetes, for example, has to be relatively advanced before symptoms like fainting from low blood sugar, loss of sensation in feet and hands, and vision loss, happen. But if caught early, diabetes can be totally reversed. It’s also a problem if you’re like me and trying to live a fast-paced, high-energy, healthy life. I don’t want issues with blood sugar, hormones, inflammation, or nutrient deficiencies to keep me from being at the top of my game or to stop me from being the parent and doctor I want to be. Especially if those issues can be prevented with early intervention. Some things can’t be prevented of course, but a lot can. I see too many people feeling foggy, anxious, tired, or irritable (and seeing this as normal) when I know it doesn’t have to be this way. This is why I started looking at my functional labs every year since I turned 32. Here’s a snapshot of my labs this year and what they’re telling me about my health—what’s working and what I can improve. My results: Overall my results are pretty great—heart health, nutrients, thyroid and blood sugar—check, check, check, check. All fell within normal ranges, which is awesome and affirming because I live the Parsley life. What my labs show I could use more of, however, is weight training, protein, and testosterone. I may be doing well overall at 42, but I also see some concerning numbers that I know I need to get on top of if I want to be feeling this good at 52. Nutrients and Toxins: Optimal Vitamin D3 – 52 B12 – 450 Folate – 578 Ferritin – 37 RBC Magnesium – 5.8 Mercury – undetectable Lead – 1.0 Inflammation: Optimal ESR – 2 hsCRP – < 0.3 Heart Health: Mostly Optimal LDL – 95 ApoB – 77 HDL – 79 Triglycerides – 51 Homocysteine – 8.1 Blood Sugar: Optimal Hemoglobin A1C – 5.2 Fasting glucose – 82 Fasting insulin – 2.4 Thyroid: Optimal TSH – 2.3 Free T4 – 1.3 Free T3 – 3.3 Testosterone: Normal, but Suboptimal Total testosterone – 19 (borderline) Free testosterone – 1.3 (low) SHBG – 177 (high) What this tells me is that I’m making pretty good testosterone but it could be better. I’d love to see my total T > 25. More importantly, my free testosterone is low because a lot of it is bound to a protein called SHBG, which for me, is too high. SHBG goes up in pregnancy, with aging, in certain conditions like HIV and liver disease, and with a low fat or low protein diet Liver Function: Optimal AST – 18 ALT – 25 GGT – 18 What about hormones like estrogen? I didn’t test hormones this time for two reasons: First, hormones like estrogen are more accurately measured in urine or saliva than blood. I plan to do the advanced DUTCH hormone test that we offer at Parsley , which will not only look at sex hormones like estrogen and testosterone, it will also give me a full review of my adrenal health including DHEA and a 5-point cortisol curve. One way to think about adrenals is as the Queens of our matriarchal biological society, meaning they are often the key driver of how our sex hormones behave. Testing gives us a more accurate and comprehensive view of our health. Second, as I’m still cycling, doing hormones on Day 21 of my menstrual cycle is the best time to test estrogen to progesterone ratios, which have implications for concerns like PMS and fertility. I wanted to get my labs done and not wait for day 21, since I knew I’d want the DUTCH to look at my other hormones anyway. What I’m doing with my results to support longevity hormone balance and anti-aging Build lean muscle mass. I recently started reformer based pilates which has been helping me build muscle and rebuild my core strength after kids. I am obsessed with Annie at Le Petite Studio who has transformed my core! Based on my labs, I’m going to add weight training 1-2x a week with a trainer. Now that I’m in my 40’s, it’s time to put muscle “in the bank.” Increase protein intake. I’m not a huge meat eater and so I probably only get around 50-60 grams of protein a day, which is too little to build muscle. To increase my intake, I’m going to add more hard boiled eggs, smoothies made with Parsley’s Rebuild Clean Protein Powder , and ensure my lunch has a protein like salmon, tofu, eggs, or beef. Today I ordered Thai with the team and I got the “extra protein” option with both tofu and shrimp in my stir fry. Lower SHBG and free up more testosterone with supplementation. Supplements that have been shown to potentially lower SHBG while increasing free Testosterone levels include Zinc, which significantly improved testosterone levels (and sexual function) in a recent study of postmenopausal women, and stinging nettle, which has been shown to weakly bind SHBG , freeing up more testosterone. Continue consuming plenty of olive oil, nuts and seeds, low mercury fish and fiber. These super foods create optimal conditions for hormone production, low inflammation and ideal cardiovascular health. No major dietary changes needed, but a reminder to lean into these foods even more. Add specialty tests including the DUTCH test. I also plan on getting a thyroid ultrasound for the nodule found on my full-body MRI , and a biopsy if necessary. The Takeaway: If you’ve been avoiding doing labs or seeing a doctor, I hope this inspires you to start taking action and gives you a list of tests to ask for. We offer all of these tests at Parsley (through your insurance) and give you personalized guidance on what to do with your results. Set up your free consultation call with a Parsley advisor if you want to learn more . RBMD Keep Reading 100 Essential Labs Every Woman Should Be Tracking Your comprehensive preventative health checklist. Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How Much Protein Should You Really Be Eating?
URL: https://www.robinberzinmd.com/how-much-protein-should-you-really-be-eating/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: How much protein should I really eat? And practically speaking, how on earth do you eat that much protein in a day even if you want to?
How much protein should you really be eating? Earlier this month, I went to a talk on muscle building and longevity where my friend Max Lugavere, a well-known podcaster, interviewed Dr. Gabrielle Lyon , a functional medicine doctor whose focus is on bodybuilding and longevity. The talk was about how much protein we need to build muscle and the benefits of building and maintaining muscle as we age. Both are proponents of eating a lot more protein than today’s RDA (recommended daily allowance) from the FDA. Robin’s Short Version RDA Is a Floor: The 0.8g/kg recommendation prevents deficiency but isn’t optimized to build or maintain muscle mass. Minimum Dose Matters: It takes at least 25–30g of protein per meal to trigger muscle synthesis, so total daily intake isn’t enough—each sitting counts. Muscle Predicts Longevity: A 2020 BMJ meta-analysis found a dose-dependent link between protein intake and lifespan, especially from plant sources. A few people came up to me after the talk. Are they right? How much protein should I really eat? And practically speaking, how on earth do you eat that much protein in a day even if you want to? The power of protein Lately it seems like everyone is talking about muscle building and protein intake, which I love, because it means we are taking the longevity movement past the hypothetical and into the practical. For me, at 42, I know it’s time to get serious about building up some muscle. I’ve lost a lot of the muscle layer I naturally had from playing sports growing up and in college, and that loss has accelerated in the past decade from having three kids and running a startup (Zoom jockey over here). If anything has fallen off my list when it comes to my health, it’s exercise, which I hate to admit. I eat well, supplement optimally, manage stress proactively, and my labs look great , but when it comes to exercise, I get a B- at best. I know that exercise is nature’s number one longevity drug, and it turns out that one of the primary ways in which exercise increases both lifespan and healthspan—the number of years you live healthy—is by building lean muscle mass. What follows is the science of how much protein to eat if you need or want to build muscle. But if you want to skip to the end to how I’m getting in optimal protein each day, go for it. The research says: I see a lot of patients in their 30s, 40s, and 50s who are treating a specific condition (like an autoimmune disease or a hormone disorder) and simultaneously looking to optimize their health for the long term. One of the top things I emphasize when it comes to longevity is building and maintaining muscle and strength. The link between muscle and lifespan People who maintain muscle mass as they age live longer. But it’s not just about mass—muscle strength matters as much if not more than muscle mass when it comes to longevity. Protein matters for both of these measures. A meta-analysis published in the British Medical Journal in 2020 showed a dose-dependent relationship between protein consumption and longevity, particularly when it came to plant-based proteins. Our ability to build muscle depends on our dietary protein intake Protein is made of amino acids, which are required to build muscle. Eaten in the right quantities, eating protein also acts as a stimulus to our bodies to build muscle. It takes about 25-30 grams of protein intake to stimulate muscle building, so the amount matters—i.e. eating an egg alone (about 6 grams of protein) won’t do it. The current RDA of protein is .8 grams per kilo or .36 grams per pound for adults under 60. (The reason these recommendations only apply to those under 60 years old is because of a lack of research, not because people over 60 don’t benefit from protein intake—muscle mass, and the protein that supports it, is even more important as we age .) For a 150 pound person, this translates to 54 g/day. But context is important when it comes to how RDAs are set. RDAs are the amount we need to avoid a deficiency, not the amount we need to optimize health or longevity. So for anyone looking to RDAs for their nutritional guidelines, I suggest reframing that guidance as what you need to literally just stay alive, not what you need to thrive. How much protein do you really need? Ignore the RDA—the optimal amount of protein we should eat daily to build muscle (vs maintain muscle) is higher. Research shows that to build muscle mass we need to intake between 1.6 to 2.2 grams of protein per kilogram of bodyweight per day. (This equates to about a gram per pound of body weight per day.) A meta-analysis of randomized control trials published in 2022 found that consuming 1.6 g/kg of protein per day, combined with resistance training, resulted in increased lean muscle mass for adults under 65. Other studies have found there’s no increased benefit for building lean muscle mass beyond 1.6 g/kg, so we should consider this a good target. Now if you want to maintain muscle as opposed to build it, the amount of protein advised is lower, but ideally still higher than the RDA. To maintain muscle you should consume at least 0.8 g/kg of body weight , but ideally closer to 1 g/kg. This is why you need to put your critical thinking cap on when you read articles like this one that says “Americans are eating way too much protein! ” The authors based this headline on the RDA, and Americans on average do get more protein than the RDA. But as we just covered, the RDA is the bare minimum, not the optimal. Plant vs animal protein The research on protein for building muscle has largely been done using animal protein sources, not plant-based protein. In addition there are some known downsides of plant-based protein sources. They are less bioavailable—you absorb 10-20% less protein from plant sources vs protein from animal sources. Many plant-based proteins are not complete proteins , meaning they don’t have the full array of amino acids (particularly the branch-chain amino acid leucine) which are required for muscle building. The best plant-based protein powders are a pea-rice blend with added leucine (such as Parsley Health’s Rebuild Clean Protein Powder ). You have to eat a high volume of plant-based protein to get the same amount of protein as you would from an animal source. For example, you would have to eat two and a half cups of quinoa to get about the same amount of protein as three ounces of beef. That’s a lot of quinoa. You’ve probably seen articles that say eating animal protein increases cancer rates. This data is also problematic. When you look at people who eat low-sugar, high-fiber, and high-quality animal protein diets, the association falls away . (The link is mostly attributed to processed meats, animal proteins high in fat, and meat cooking methods like smoking and grilling.) Big Macs and fries are not the same as a lean steak and a salad, it turns out. What about animal welfare and ethical issues? Personally, I don’t eat pigs or birds because it’s very difficult to source ethically and sustainably raised pork and poultry in the US. I find it much easier to find ethically and sustainably raised beef and seafood, so I eat both, but try to find pasture-raised grass-fed beef and sustainably fished wild and farmed seafood sources. If you’re fully vegetarian or vegan, it is very hard to get enough protein to build muscle without a lot of dairy consumption or processed protein supplements. You have to be very diligent. I offer a few plant-based options below. How to actually eat enough protein Eating the optimal amount of protein a day, while staying within a 1,600-2,000 calorie a day diet (and not feeling so full you can’t stuff in another mouthful), is hard for some people—including me. I haven’t been in a phase where I’m trying to build muscle, I’ve been mainly in maintenance mode, so I currently get closer to 0.6 grams of protein per pound of body weight a day—if I focus on my protein intake and I’m diligent about it. My mindset is changing, however. At 42, with a goal of maximizing longevity and health span (the number of years I am active and healthy), I know that after having three children and a pretty sedentary job, I need to start building muscle to maintain my metabolic and cognitive function. That means I need to both increase my protein intake AND increase my weight training. There is no point in eating a gram of protein per pound of body weight a day just to sit and stare at a screen for 10 hours a day. I’ve started adding weights to the equation with a once-a-week reformer-based pilates session. Next up, I’m investigating getting a trainer and adding two days per week of weight training to my regimen. Once I do that, I’ll try to increase my protein intake by about 30-40 grams per day so that I can build vs just maintain muscle. In the meantime, I am getting my 80 or so maintenance grams by eating fish, meat, and eggs, and supplementing with optimized protein powders like Parsley’s Rebuild. Here’s what a typical day’s protein intake looks like for me: 3 egg omelet – 18 grams 1 Rebuild Protein smoothie – 26 grams 1 6 oz portion of salmon – 36 grams Total protein intake: 80 grams To up that by 30+ grams to build muscle, I’ll need to add options like: 1 ounce of parmesan cheese – 10 grams Plant-based protein bar snack – 20 grams 1 cup whole fat, no sugar added Greek yogurt – 18 grams 1 cup tofu – 20 grams 3 oz beef – 22 grams 3 oz shrimp – 21 grams The takeaway Eating more protein is good for building muscle. And building muscle, both volume and strength, is good for longevity. You can get enough protein as a vegetarian but it’s hard—eating some form of animal protein makes it a lot more doable. If you’re looking to work with a doctor who understands nutrition and longevity and will adapt these recommendations to a personalized nutrition and fitness regimen, work with us at Parsley Health. Learn more with a free call . RBMD Keep Reading Forget Weight—Muscle Mass Is the Real Longevity Metric. 4 fasting for women strategies to optimize longevity. 10 nutrient-dense snacks I pack on-the-go Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The best diet for brain health?
URL: https://www.robinberzinmd.com/the-best-diet-for-brain-health/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: To have the healthiest mind, growing evidence shows the best diet for brain health is the Mediterranean diet.
New science on the impact of ultra-processed foods on our brains has been in the news a lot lately, so I’ve been thinking about the the best diet for brain health and the connection between food, mood, and the brain. Spoiler alert: your brain and your mood are directly impacted by your food choices (both now and in the future). Robin’s Short Version Balance Beats Restriction: Among 180,000 people studied, those eating a balanced mix of plants, nuts, seeds, fiber, and fish had the lowest rates of depression and anxiety. Animal Protein Risk: High animal protein, low-fiber diets were linked to the worst mental health outcomes, including elevated anxiety, depression, and stroke rates. 30-Day Reset: Eliminating gluten and processed foods for just 30 days can lift chronic brain fog that many people don’t realize is affecting their daily function. It has also officially been six months since I relaunched my newsletter! My goal is to break down complex topics and offer ways to easily build healthy habits into your life. I’m loving writing these posts for you. Health doesn’t have to be hard: it can be easy with the right guidance (from my personal lived experience and the experience of over 40,000 patients who have seen amazing results working with the team at Parsley Health). Together we can live our healthiest, most abundant lives. Please send me your feedback, questions, and topic requests—I’m listening. And if you know anyone who would benefit from my posts, please pass on this subscription link . Back to the best diet for brain health and how the foods we can eat impact our minds. In my experience, food is the most powerful tool we have to influence our health, both in the moment, as well as long-term when it comes to emotional stability, focus, attention, and clarity. For me personally, the impact is immediate. I’m sensitive to both gluten and refined carbs, which impact metabolism, inflammation, and gut health in one fell swoop. The number one way I experience this sensitivity is brain fog . I can have a slice of pizza, but I pay the price the next day—I feel out of it, irritable, have trouble focusing, and usually have a low grade headache. I have so many patients who experience the same and the clarity they feel after a simple 30-day elimination diet is profound. One of my patients recently said to me that she had no idea how she got through life for so long living in a fog. “Since cutting out gluten and processed foods, it’s like I have a new brain,” she said. Wheat, bread, refined sugar, and processed carbs are just some of the foods that impact our mental health. To have the healthiest mind, growing evidence shows the Mediterranean Diet—a diet high in fruits and vegetables, fiber, nuts seeds, fish, and moderate animal protein consumption—wins. For the five foods I’m eating every day for optimal brain health and better mood, skip ahead to the takeaways. For the science, read on. The research says Just last month a major study published in Nature , which analyzed data from over 180,000 people in the UK biobank data set, showed that a balanced diet—defined as high in plants, nuts, seeds, fiber, fish, and protein—was the best for long-term mental health and cognitive function. The study assessed differences in various brain health domains including mental health, cognitive function, blood and metabolism biomarkers, brain magnetic resonance imaging (MRI) traits, along with longitudinal data on mental health disorders, and genetics. Based on participants’ food preferences, the study identified four common dietary subtypes: Type 1: Low starch, high veg and protein Type 2: Vegetarian (low protein) Type 3: High protein, low fiber Type 4: Balanced across all food groups Researchers determined Type 4 was ultimately the best diet for brain health. People who preferred a healthy balanced diet scored best on several measures of brain health: they had the lowest rates of depression and anxiety, the highest rates of well-being and cognitive function, the healthiest blood biomarker levels for brain health (including blood sugar and fatty acids), and the best MRI results. Those who preferred a Type 3 diet—what I would call the “Big Mac diet” consisting mostly of animal protein and simple starches—had the highest rates of anxiety, depression, and stroke. The balanced diet, which is essentially the Mediterranean diet, had the lowest rates. Unfortunately, most people aren’t eating a Type 4 diet— 73% of the US food supply is ultra-processed , meaning the average American adult gets more than 60% of their daily calories from ultra-processed foods. People who eat an ultra-processed diet have worse learning and memory, according to a recent study conducted in Australia, and also have higher rates of depression and anxiety, according to another study published in the British Medical Journal this year. So, if Americans are effectively eating ultra-processed foods, i.e. snacks, for the majority of their food intake, is it any wonder that rates of anxiety and depression are skyrocketing, while diseases like dementia and Alzheimer’s have become leading causes of death? With the evidence as clear as it is, it blows my mind that medical schools and top residency programs still train young doctors to say what you eat doesn’t matter. The good news is small but meaningful changes in diet have a big impact. For example, a study presented at the American Society for Nutrition’s annual meeting last year found that people who had at least ½ tablespoon of olive oil a day had a 28% reduced risk of dying from dementia. Research also shows eating fermented foods to support a healthy gut microbiome, results in less depression and anxiety and better cognitive function. Over time, these small changes can make a significant impact on longevity and brain health. A meta-analysis published in March found those who eat a Mediterranean diet are 11% less likely to develop all types of dementia and 27% less likely to develop Alzheimer’s. The Takeaway You can optimize brain health and mental well-being through the foods you eat every day. Here is what I eat knowing what I know: EVOO : I eat 1 tablespoon of extra virgin olive oil or greater daily. Usually in salads, or on fish and grains and veggies, but I’ll drink it straight from the spoon if I have to. Fermented foods : Sauerkraut (with no-added sugar), full-fat yogurt, or a tablespoon of apple cider vinegar mixed with sparkling water daily helps to support my gut microbes. I also take Parsley’s full-spectrum probiotic nightly for digestion, so I’m not reliant on eating fermented foods alone. Fish: I eat high-quality, low-mercury fish and seafood at least five times a week in the form of salmon, shellfish, hake, or seabass. It’s great source of omega-3 fats as well as protein. Gluten-free, whole, plant-based starch : Quinoa, rice, and purple potatoes are my starches. I’m not a zero carb girl, but I limit intake to midday and evening meals, and to ½ cup servings. Leafy greens: I make sure to get these daily, including kale, chard, and romaine lettuce alongside cruciferous veggies like broccoli, brussels, and cabbage both for the fiber and brain healthy polyphenols. When the occasional slice of pizza does sneak in, I treat the following day as a brain restorative day starting with detoxifying supplements like Parsley’s Daily Dose Multivitamin and Endura Hydration Powder from Metagenics . I make sure to eat lots of protein, healthy fat, greens, and fiber and zero sugar, gluten, or refined carbs. I usually feel back to amazing by that night or the next morning. Onwards! If you’re looking to work with a medical team who can tailor personalized nutrition recommendations to your lab test results and risk factors, this is what the Parsley Health team does daily. Learn more with a free call . Keep Reading How to Slow Brain Aging Starting in Your 40s Bloating and brain fog? You’re probably low in butyrate. Omega-3 deficiency is as harmful as smoking Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to balance cortisol levels to increase energy and lose weight
URL: https://www.robinberzinmd.com/how-to-balance-cortisol-levels-to-increase-energy-and-lose-weight/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: Treating patients’ health issues from weight gain to infertility often includes a plan to balance cortisol levels. Here’s what you can do.
Earlier this week I read an article in the WSJ’s health section about how to balance cortisol levels. It barely skimmed the surface of what you need to know about the vital hormone that plays a role in everything from your energy to your ability to lose weight. Robin’s Short Version Cortisol Spikes Insulin: Chronically elevated cortisol raises blood sugar, triggering insulin spikes that make stubborn weight nearly impossible to lose. Ditch the Cardio: Swapping intense cardio for yoga can lower cortisol enough to reduce cravings and shed weight — even with 80% less exercise. Beat the 11 PM Surge: Staying awake past 11 p.m. triggers a cortisol flood that creates false energy and degrades sleep quality overnight. I treat patients with cortisol-related health issues all the time with a lot of success. So, I’m diving in. Why cortisol? Your cortisol levels have a profound impact on your metabolism and your energy levels. I just saw a patient this week who finally lost the proverbial last 10 pounds because we were able to address the way cortisol was impacting his metabolism. Another patient of mine finally got her fasting blood sugar down to 80 when it had been firmly stuck at 95 after she was finally able to balance cortisol levels. Another patient got pregnant after balancing her chronically high cortisol, which was reducing her progesterone levels and impacting her fertility. Balancing cortisol levels was the key for all three patients. My cortisol I got interested in cortisol in med school when I read a study about how stress impacts the immune system. The researchers gave medical students paper cuts and showed that they took longer to heal when the students were stressed around exams, than when they weren’t stressed over a holiday. Maybe I just took the article personally since they were experimenting on people who could have been my classmates, but I loved understanding the interplay between stress, cortisol, and our immune system’s ability to heal injury. Also around that time I (unintentionally) ran my own experiment on my cortisol patterns. I was running a lot and doing tons of cardio at the gym, while also studying a lot and being chronically stressed. I was always hungry, always craving carbs, and almost always cranky and irritable. Burned out, I started doing more yoga. It was hard in a different way than running but also calming to my nervous system. Over time, I found myself with fewer cravings, more energy and oddly, I didn’t have to work so hard to stay in shape. In fact the weight I always felt I was in a bit of a war with just went away—even though I’d cut my cardio by 80%. This was a huge lesson in the way that stress literally packs on the pounds. When I trained later in functional medicine, I learned how cortisol was causing that phenomenon and how by switching from intense cardio-focused workouts to yoga-focused workouts, I’d unintentionally hacked my own cortisol for increased energy , improved mood , and healthier body weight . Today, I balance cortisol levels in a different way. If I stay up too late I get that “second wind” or “witching hour” energy spike, which is really a flood of cortisol that comes for most people between 11 p.m. and 1 a.m. if they’re still awake. When I do that, my sleep is terrible, so I’m motivated to get to bed before 10:30 p.m. The Research: Cortisol is a hormone produced by the adrenals, two glands that sit one atop each kidney. They respond to signals in the brain in response to stress—both physical stress, like being sick or injured, and mental stress. Cortisol (along with neurotransmitters norepinephrine and epinephrine, also produced by the adrenals) increases the amount of glucose, or blood sugar, released into the bloodstream to support muscles and brain function in response to stress. These hormones also increase blood pressure, heart rate, and breathing rate. This is an adaptive response—we need cortisol to be able to fight an attacker, or run from a predator. But when cortisol is high all the time, due to chronic stress, downstream effects start to become negative. Weight gain: Overproduction of cortisol and the corresponding blood sugar elevation increase insulin levels. (Insulin’s function is to move sugar out of the blood back into the cells.) When this happens constantly, you store more fat—particularly abdominal fat. Increased risk of diabetes: Chronically high insulin levels can cause insulin resistance , the precursor to diabetes. Decreased immune function: High cortisol suppresses the immune system, making you more likely to get sick. The truth about cortisol In my practice, I often see cortisol high when it should be low and low when it should be high—fluctuations caused by chronic stress, poor sleep, and chronic conditions like diabetes. These cortisol pattern disruptions show up as: Fatigue Mood disturbances like anxiety and depression Insomnia Stubborn weight gain or inability to lose weight In some cases, even infertility The good news is that, in most cases, we have can balance cortisol levels. That’s why the advice from a prominent endocrinologist in this WSJ article on the topic who effectively said not to take supplements for adrenal health because they might have the wrong ingredients in them actually made me laugh out loud. If you’re working with a doctor, isn’t it their responsibility to be supplement literate, know which supplements impact cortisol for the better, and to prescribe safe tested supplements? It is at Parsley. But, moving on. The article also cites a literature review that says “Adrenal fatigue does not exist!” As a rule, if you ever see the medical community insisting to patients that a condition doesn’t exist, we are usually about 10 years out from an apology and further reviews of the literature showing that the condition is in fact real. I’ll wait! The following is how I approach how to balance cortisol levels for my patients if I see signs of mood, energy, weight, or hormone imbalances that cortisol may impact. How to balance cortisol levels Step 1: Test cortisol the right way. Testing cortisol the right way is key. I recommend a 5-point saliva or urine test that maps your daily cortisol pattern along with testing related hormones (like those produced by the thyroid and progesterone), and blood sugar markers. Skip one-off blood tests which don’t give you a view of your cortisol pattern throughout the day. Cortisol should be high on waking and slowly come down mid day, being lowest at night. If your cortisol is: Low in the morning—it could be why you’re tired. High in the evening—it could be why you can’t fall asleep. High all day—it might be why you are dealing with stubborn belly fat. I also recommend testing related hormones including: Thyroid levels Progesterone Testosterone (free and total) SHBG (sex hormone binding globulin) DHEA-S You should also test fasting blood sugar, fasting insulin, and HgbA1C along with key nutrients like iodine, iron, zinc, selenium, and Vitamin D3. At Parsley we use either the ZRT or the Genova Adrenocortex with CAR test (if we just want to look at cortisol levels) or the DUTCH Complete urine hormone test if we also want to look at sex hormones. Step 2: Eat to balance your cortisol curve. Time your carb intake. Cortisol should be elevated from waking to midday. If you’re experiencing weight gain, avoid carbs and sugar in the morning (when cortisol is high) to avoid storing these easily accessible calories as fat. Save your carbs for midday when cortisol is lower. Eat adrenal happy foods . The adrenals like water, protein, healthy fats, and fiber. Eat lots of vegetables, stay hydrated, and add electrolytes to your water (I love Endura from Metagenics or just a pinch of pink sea salt). I also find a way to get EVOO in every day. Step 3: Use safe, trusted, and personalized supplements to balance cortisol. Do not go pull supplements off the shelf or on Amazon. To the WSJ’s point, there are too many supplements for “adrenal health” that have actual steroid hormones or thyroid hormones in them. Supplements can be mislabeled or not labeled at all. Even with vetted supplements, if you haven’t tested and don’t know if your cortisol is high or low, you don’t know what you’re treating and can actually make the problem worse. That said, here is what I recommend: For low cortisol : Adaptogens like Panax Ginseng may help balance cortisol by regulating the hypothalamic–pituitary–adrenal axis and the sympathetic nervous system . For very low cortisol, we prescribe licorice (but be careful if you have high blood pressure). For high cortisol: Calming adaptogens like ashwagandha have been shown in some studies to reduce cortisol levels (and may also help treat anxiety ). You can also take phosphatidylserine in the evening to reduce high evening cortisol and support sleep. And add magnesium glycinate or threonate for calming the nervous system day or night. Finally, take 2 grams of Omega-3s daily. Studies show omega-3 supplementation can lower cortisol levels and blunt cardiovascular and sympathetic stress reactivity. If you’d like to get your hormones tested and develop a personalized treatment plan to address cortisol, thyroid, sex hormones or other health issues, work with us at Parsley Health. Learn more with a free call . Keep Reading How to reduce stress in 15-minutes The Cortisol Reset Every Woman Needs Is Sleep Consistency the Most Overlooked Lever of Longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Randi Zuckerberg’s Astonishing Marathon Motivation Is the Inspiration I Needed
URL: https://www.robinberzinmd.com/so-busy-so-healthy-randi-zuckerberg/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Welcome to So Busy, So Healthy, my interview series with people who are so freaking busy yet somehow able to invest in their health. First up, Randi Zucker
Randi Zuckerberg is a good friend of mine in NYC, a fellow mom of three, and someone I’ve always admired for her passion for theater and the arts, success as an entrepreneur, interview skills as a radio show host, and dedication as an investor—all while being a wonderful human. In a word, this woman is BUSY. But recently she went through a transformation of sorts, becoming a serial marathon runner. Basically out of nowhere. As she posted videos and photos on stories of her races (which seemed to get longer and longer), the occasional injuries, the early mornings, the crew of new running friends and the highlights of her latest racing ambitions, I found myself wondering: How on earth are you so busy, yet finding the time to be so healthy? And so our new series for my newsletter was born. Welcome to So Busy, So Healthy , a new interview series with people who are so freaking busy and yet somehow are able to invest in their health in some inspiring and unique to them (but could be us, too) way. Periodically in between my favorite product recommendations, and deep dives into the medical research on topics like protein and cortisol , I’ll share my conversations with people like Randi who definitely have no extra minutes of the day but somehow find the inspiration and time to be healthy. As someone who ran one marathon in 2004 (Philadelphia) and swore she would never run again (and as a busy mom for whom exercise has definitely become the first thing to fall off my list), I found Randi’s approach to health emotionally energizing. We all want to do the things that we know will make us feel great, but we all also know that it’s harder than it should be. I hope this interview with Randi gives you a shot in the arm, as they say, like it did for me! Robin’s Short Version Skip “Balance”: Zuckerberg credits her productivity to being “well-lopsided”—fully committing to a few priorities instead of spreading effort evenly across everything. Community Over Fitness: She rejoined running after 20 years not for health goals, but to cure post-COVID loneliness by connecting with women who ran races and brunched together. Slow Base-Building: Before racing her first 10k, she spent months on a treadmill gradually working up to running just a few miles continuously and without knee pain. Image courtesy of Randi Zuckerberg RB: You’re clearly super busy. What drives you/motivates you to take on so much? RZ: If you want something done, give it to a busy mom! In all seriousness, I’ve had a philosophy for the past decade of giving myself permission to be well-lopsided, rather than well-balanced. I find that when I allow myself to really focus on giving my all in a few areas, I feel happier, more fulfilled, and am better able to show up in all areas of my life. Right now, my main focus areas are: supporting the arts (investing, producing, and building technology), women in sports (specifically around my passions of running and golf), and of course, my family. How did you get into running and what inspired you to take on marathon training? I’ve loved running my entire life, but I took a twenty year break from it while focusing on my career and having three children. Every time I tried to restart, I’d have knee pain or I was too out of shape and exhausted, and would immediately give up. Post-covid, I think many of us craved community and a sense of belonging. I felt lonely in my soul in a way that was hard to describe, given that I had just spent the past two straight years stuck in my home with eight people! I started going to a local gym a few blocks from where I lived and there was a lovely group of women who would run races on the weekend and go out for brunch. They seemed so friendly and so happy and I thought, well, I don’t know if I’m that into running, but I LOVE brunch and would love to meet more nice women. After a few months of building up my endurance and fitness to be able to run a few miles nonstop on the treadmill, I joined them for a 10k in Central Park. Little did I know how that one 10k would transform my entire life. I felt so powerful being out there running, so inspired by the thousands of other women showing up for themselves on a Saturday morning running alongside me (or mostly, in front of me). This thought flashed through my mind that for the past twenty years I had been someone’s sister, someone’s wife, someone’s mom. But this? This was ALL MINE. Nobody can attribute running six miles to anybody else. It’s just you, your body, and your hard work. From that moment, I was hooked. Since June 2023, I have completed twelve half marathons, six marathons, and five ultra-marathons (ranging from 30 to 50 miles.) I’ve had eight podium finishes with two overall wins. But the biggest PR of all is the community I’ve formed. Those women at the gym—they have become my closest friends, my sisters truly. Let’s get practical. How do you fit your training into your week? Ah, I love this question because, in many ways, it’s still a work in progress. I think the biggest thing is that I’ve become a pro at early mornings. I never used to be a morning person before—now I wake up at 5 a.m. every day. Waking up before the household gives me the uninterrupted time I need for training and still be finished in time to do school drop-off. You can’t burn the candle on both ends though, so I’ve had to adjust my social life to be more morning-focused (coffee and lunch dates, morning walks or jogs in the park), saying no to evening hangouts. I try to be in bed by 9:30 or 10 p.m. most nights, which is not very glamorous. On the weekends, I do at least one super long run day where I am away from home for several hours, putting in long mileage. Sometimes I’ll go solo, sometimes we’ll try and make it a family thing. Taking on such a lofty health goal often means sacrifice—what have you gained by staying committed? You learn more about yourself in 26.2 miles than most people learn in a lifetime. It has changed how I walk into a room. I used to walk into rooms of mostly men/tech bros and be quiet, intimidated or feel invisible. Now I walk into a room with my head held so high, like, “yeah I just ran a 50 mile race this weekend, I have NOTHING to prove to any of you.” Many of those men have reached out in fact, to ask my advice on racing, long distances, or have since asked to run with me. All my life, I’ve been surrounded by people chasing the wrong things—money and power—and it took me training for a marathon to realize that the biggest flex in life is health and community. I feel richer in my life right now than I have ever felt. What’s your advice for people trying to start running/exercising regularly? Start small. In January 2023, I could barely run a mile and now here I am entering multiple 100-mile races (eek!). Consistency is everything. Make it a daily habit to show up for yourself and you will be shocked at the gains you achieve and the friendships you form along the way. The journey is the fun part. That beginner journey is so sweet and so rewarding because you improve so quickly. The PRs just come flying! If I could go back, I’d remind myself to savor every moment and appreciate the bonds forged through exercise. Want more practical tips on how to stay healthy? Subscribe to my newsletter . Keep Reading Functional medicine changed my life. Chronological vs. Biological Age: Which One Really Matters? How Much Does Vigorous Exercise Really Matter? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## 5 Summer Essentials I Can’t Live Without
URL: https://www.robinberzinmd.com/5-summer-essentials-i-cant-live-without/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: It’s summer and this means I’m constantly throwing my go-to stack of protection from the elements in my bag or the stroller before I head out the door. I g
It’s summer and this means I’m constantly throwing my go-to stack of protection from the elements in my bag or the stroller before I head out the door. I get asked all the time about my summer essentials—which sunscreens, lotions, bug sprays, hydration supplements, and other warm weather strategies I use to keep myself and my kids from ending up fried and bitten out there, so I thought I’d share! Robin’s Short Version Chemical Sunscreen Risk: Oxybenzone and similar filters are hormone disruptors found in breast milk and blood samples. DEET Safety Threshold: Below 30% concentration, DEET shows no links to hormone disruption or cancer, making it a vetted repellent choice. UV Clothing Advantage: Rash guards deliver reapplication-free sun protection—critical when kids are constantly in and out of the water. When I pick my products I look for these criteria: Non-toxic, organic, and clean (whenever possible) High-performance Science-backed I hope this makes your summer a little easier and more fun! See you out there. 1. Sunscreen A lot of people now know that conventional sunscreen contains active ingredients like oxybenzone, avobenzone, octinoxate, and homosalate, that are effective for sun protection, but are also known hormone-disrupting chemicals that are absorbed into the skin. These chemicals have shown up in breast milk and blood samples and have been linked to everything from dermatitis, to blocking testosterone receptors, to potential impacts for fetal development , according to the Environmental Working Group (EWG), which studies the health and environmental impact of products and their ingredients. They have a great guide on safe sunscreen ingredients if you want a deep dive and a handy database of all the sunscreens they’ve verified as safe. (These “oxy’s” are also harmful to the animals, plants, and fish that consume them after we swim in their ocean and lake habitats.) For a while it felt like finding a mineral-based sunscreen that doesn’t cause health issues but is just as effective, non-toxic, AND that also doesn’t make you look like you just applied spackle to your face, was nearly impossible. Thankfully newer brands of non-harmful sunscreen abound these days that are effective and feel good! My go-to(s): I like Babo Botanicals Super Shield Sunscreen SPF 50 and Babo Botanicals Sensitive Baby Mineral Sunscreen SPF 50 for kids. Both use zinc oxide as the active ingredient and are verified safe by the EWG. Importantly, they are light, sheer, rub in easily, and they last! 2. UV clothing Even with the best sunscreen, I can be terrible about reapplying—I just forget. I also find my kids’ “sunscreen mood” highly variable. Going through the effort to chase them down and reapply—especially if they are in and out of the water—is a struggle I’d like to skip. I love to put UV rash guards on all of us at the beach or pool to set it and forget it. My go-to(s): These Mott50 rash guards are some of the cutest ones I’ve found for kids and for grownups . I also try not to forget a hat. These Goldwin Light Stretch Hats have style while also being super functional (and easy to pack). 3. Bug Spray When it comes to insect repellent there is a lot of misinformation out there. Despite its controversial reputation, DEET is highly effective against mosquitos and ticks and the illnesses they carry. including Zika, West Nile, Malaria, and Lyme disease, according to the EWG . DEET became controversial in the 1980s when studies suggested it might cause adverse health effects. But comprehensive followup research has found “ no risks of concern ” for people or the environment if applied at less than 30% concentration. For kids, “concerns have been raised about DEET’s potential to be neurotoxic to children but follow-up studies have not linked DEET to neurotoxicity,” according to the EWG. Though the American Academy of Pediatrics recommends using sparingly on children under 2 years old. To protect against bites, the most effective move is an insect repellant formulated with DEET, Picaridin, or a chemical called IR3535, according to the EWG . None have been found to be hormone disruptors, cancer causing, or otherwise harmful to health to date. (Avoid foggers and outdoor “bug bombs,” which have been linked to negative health effects.) That said, if you are like me and have an occasional “natural or the highway” streak (and want something that smells good) Oil of Lemon Eucalyptus can be a good option. Note: it may not last as long as DEET and synthetic options so you may have to reapply—and be careful about oil on clothing and furniture. My go-to(s): If I’m really out in it and I need something serious, my go-to is Cutter Backwoods Insect Repellent with 25% DEET. My favorite Oil of Lemon Eucalyptus brand is Murphy’s Naturals or Nantucket Spider , which smells great and is a blend of natural oils. 4. Hydration If you’re outside in the heat (especially if you’re doing something active), the CDC recommends drinking one cup of water every 15 to 20 minutes. I love to keep electrolyte powders in my bag to put in my and my kids’ water bottles to make staying hydrated easier. We sweat more than we think and dehydration is why you sometimes feel wiped out at the end of the day—it also increases your risk of heat exhaustion and heat stroke , which can be deadly. Electrolyte powders containing sodium and potassium (which help increase your GI tract’s absorption of water) improve hydration and can help reduce your risk of heat exhaustion. Plus, they taste good. My go-to(s): I like Endura from Metagenics because it tastes good. (While it has Stevia, it doesn’t have the bitter taste of Stevia which some people including myself don’t love.) It has a complete set of electrolytes, malic acid (great for muscle recovery if you are swimming, hiking, or working out), taurine (which increases the cell’s ability to hold water), and l-glutamine (to improve GI absorption). LMNT is a simpler formula for electrolytes, plus stevia. Both work well, so it’s a matter of taste! 5. Aftersun care I am not a fan of lotion, in general. Too many ingredients, usually fragrances or synthetic chemicals, and unpredictable absorption. For regular moisturizer, I use body oil. If I’ve had too much sun and want something cooling, I use an aloe gel moisturizer. If you find yourself scorched, the American Academy of Dermatology recommends cool showers, ibuprofen, lots of water, and using an aloe-based moisturizer. Aloe has anti-inflammatory benefits and while it won’t make a bad sunburn heal faster, it can help soothe the pain and keep you comfortable while your skin heals. My go-to(s): For a bad sunburn, I recommend Babo’s After Sun Soothing Hydrating Aloe Gel or Aloe & Cucumber Soothing Mist . Interested in more Parsley Health-vetted products? Learn about membership . Keep Reading My personal supplement stack. My inside/outside skincare protocol My personal microplastics protocol Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Should you be taking peptides?
URL: https://www.robinberzinmd.com/should-you-be-taking-peptides/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Peptides are everywhere in longevity circles right now. I’ve dug into the research — here’s what I actually think works, what’s overhyped, and what I’m
If you’re following the longevity trend, you’ve probably seen peptides making the news a lot lately, either touted as the future of regenerative medicine, promising to turn the tide on aging, or banned by the FDA. Robin’s Short Version Already In Use: Collagen and creatine are both peptides, meaning many people use them daily without realizing it. FDA Drew a Line: 17 peptides including BPC-157 were banned from compounding pharmacies over unresolved safety concerns. Thin Evidence Base: Even the most-cited human peptide trials are tiny — a key wrinkle study enrolled only 55 women. My patients and friends are pinging me and asking, what gives? I even had an investor reach out and ask if I would advise their investment thesis in the space. Everyone wants to know: Should I be using peptides? Are they safe? And, if so, which peptides have the most promise? Honestly, I found myself asking the same question. No one at Columbia or Mount Sinai trained me on peptides as the fountain of youth—but no one at Columbia or Mount Sinai trained me to spot the root cause drivers of acne or anxiety either. Our current medical education system has its limits. I am in my “ brains, bones, booty ” phase of life—post-babies and pre-menopause—I’m looking to optimize the aspects of my health that help me feel fit, strong, energized, and vital now (and will keep me that way decades into the future). I am willing to try things that are safe, make sense to me based on my years of training and patient care, and that people I respect are big on. So, will I be taking peptides? And do I think you should be? Let’s dive in. What are peptides and what do they do? Peptides are like voice notes to your cells—they give cells instructions on what to do. Scientifically speaking, peptides are short strings of amino acids, the building blocks of proteins. There are hundreds of thousands of peptides at work in your body right now (including hormones you probably recognize like oxytocin, insulin, and prolactin). Some peptides are readily available as supplements . You may already be taking one or two of them. Collagen (typically found in skin care products and supplements but also studied for its potential to support bones and joints) and creatine (used to help build muscle) are two of the most popular and well-researched peptides on the market. Other peptides are available as drug therapies . Like GLP-1s (aka Ozempic). These medications trigger appetite suppression and have revolutionized the way we treat chronic conditions like diabetes. Then there are the experimental peptides. Buzzy peptides like BPC-157 and Ta1 (thymosin alpha 1) are popular among biohackers and are being used experimentally in the regenerative medicine and athlete communities, where animal-based research suggests they may be able to slow cellular aging or supercharge the immune system, for example. These experimental therapies are being used in people despite not always having the kinds of randomized controlled trials that drugs go through to prove that they are both safe and actually work. (The U.S. Anti-Doping Agency actually banned the use of BPC-157 back in 2020 amid concerns it may pose a risk of negative health effects for athletes.) Where there are randomized controlled trials for peptide use in humans— like this one investigating the use of peptide serum to treat wrinkles—the data is what we call “small data.” This particular study found that using peptide serum called Revox B77 twice a day for 12 weeks reduced the appearance of frown lines—but there were only 55 women in the study. So I find myself asking ok, but was it better than botox? Are there any long-term side effects? The answer: we don’t know. The TL; DR: Most peptides have not been studied as drugs, and while there is promising early research on the use of peptides for diabetes, Alzheimer’s disease , inflammatory diseases , and even sexual dysfunction , the jury is still out. Why did the FDA ban some peptides? Last year, the FDA banned compounding pharmacies from selling 17 popular peptides—including BPC-157 and Ta1. Are they being appropriately conservative or overly cautious? For most of the peptides in question, the ban is due to the lack of sufficient evidence on safety, the risk of impurities in the formulation (a risk for any unregulated supplement), and the potential for a substance to trigger a negative immune response. But there are a few peptides on this list linked to more concerning risks in humans including “serious adverse events” (AOD-9604), “detrimental effects on male reproduction” (Cathelicidin LL-37), “heart toxicity” and arrhythmia ( Cesium chloride ), and certain cancers in women ( Diethylstilbestro l). My POV: I’ve rarely seen a shortcut work in the long run. Okay, so what does this all mean? There is a huge range of peptides being isolated from plants and animals and even derived from the human body. With the appropriate research, there is massive potential for medicine and longevity. Many of them are already promising and more research is coming. But the bottom line is, you should talk to your doctor before taking anything new. To me peptides feel like that hot new makeup or trendy bag that your cool girlfriends had in high school. They are doing it, so shouldn’t I be too? Before you walk off a cliff because the popular kids did it, take a beat and look over the edge. Because experimental peptides don’t have established safe dosages, minimum effective dosages, or side effect profiles, I’m cautious. If you’re taking them, you’re running an experiment on yourself that isn’t really necessary—there are other more proven ways of achieving the exact same goals. What I’m doing for my own body when it comes to peptides. I’m using vetted peptides like marine collagen (10 grams daily), to improve skin elasticity, hair and nail strength, and muscle and bone strength. (I used this during pregnancy to help improve skin elasticity with all the belly stretching and I am convinced it’s partially why I don’t have stretch marks.) I’m also considering adding creatine to my regimen on weight training days to support building muscle mass . Getting a trainer is on my list of to-do’s this summer and taking 5 grams of creatine like this one from Thorne in water post-workout may help increase strength and lean muscle mass . But for now, I’m a pass on experimental peptides like BP-157 for regenerative medicine purposes. Will I change my mind? Maybe! If more compelling evidence for how to best use these types of experimental peptides in humans comes forth, I’m all in for recommending them. Point of view plasticity is a sign of cognitive health just like brain plasticity 🙂 What I recommend for you: When it comes to your health, supplements like peptides can help you advance your goals, but will never on their own come close to having the impact that the following four pillars of health can: Nutrition: Eat real unprocessed foods, get sufficient protein, fiber, and healthy fats. Hint: It’s almost impossible to overeat unprocessed foods because your body’s natural GLP-1 kicks in. Processed foods override our GLP-1 derived satiety (i.e. feeling full) signal leading you to overeat. Exercise: Focus on weight training to build muscle mass and optimize body composition, cardio for heart, mood, and brain health, and functional movements like yoga for balance and connective tissue stimulation. Metabolic health: Keep blood sugar (both fasting and post-meal) balanced and fasting insulin low (< 5.0). Hint: Use a continuous glucose monitor (CGM) if you want to see how you respond to meals . Emotional wellbeing: Invest in community, connection, and stress-reduction through practices like meditation. These four pillars will give you 90% of the results you are looking for and are essential to health. Without them, no supplement or drug will make or break how you feel today or meaningfully impact your healthspan tomorrow. If you’re looking for a leg up, enhance your well-being through key supplements that are personalized to you . Ideally, by working with us at Parsley Health where we can tailor recs for things like peptides to your body and your unique goals. Keep Reading My personal supplement stack. Is NAD+ the key to energy and longevity? Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Are you using the right EVOO?
URL: https://www.robinberzinmd.com/is-your-olive-oil-fake/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I treat EVOO like a supplement. But if your olive oil is fake, you’re missing out on key health benefits. Here’s what to know.
Is your olive oil fake? Robin’s Short Version Widespread Label Fraud: In a 2015 test, 6 of 11 major grocery store EVOO brands failed International Olive Council quality standards. Lost Health Benefits: Degraded or diluted olive oil loses oleocanthal and antioxidants responsible for its heart, brain, and cancer-protective effects. Daily Supplement Dose: Robin aims for at least one tablespoon of high-quality EVOO daily—drunk straight, blended into smoothies, or added to food. I’ve been doubling down on my EVOO consumption (that’s extra virgin olive oil for those of you who spend less time grocery shopping than I do!) lately. The brain health and heart health benefits of olive oil are tremendous and well-documented. And more recent research has further convinced me that having at least one tablespoon of high-quality olive oil daily is possibly the most important supplement I’m taking. But as it turns out, not all EVOO is created equal. Recently, I posted a story on IG about my love for olive oil, while holding a big tin of Whole Foods 365 brand in my hand. The reaction took me a bit by surprise: this community went nuts calling me out for my low EVOO standards, other EVOO brands sent me reports busting competitors (with requests for anonymity) for their low quality products, and my DMs were flooded with people debating the purity of their favorite popular brands. I now call this episode “Oil Gate.” Apparently you are all very passionate about this topic! As you should be. Given all the EVOO enthusiasm, I decided to dive into the research and get to the bottom of what makes an olive oil low-quality, which brands are legit, and why this all matters for your health. The controversy over fake olive oil Food fraud is a big problem. Misleading or mislabeled foods, foods that mask their true origin, and foods chemically modified, diluted, or cut with cheaper products, are rampant on shelves. Olive oil is among the top three most commonly faked foods (along with milk and honey—who knew?). Before you panic, this isn’t necessarily cause for alarm. In the case of olive oil, “fake” most often means oil that’s labeled “extra virgin” (meaning high-grade, minimally processed, and super fresh) when it doesn’t actually meet those top tier standards , or olive oil that’s diluted with cheaper vegetable and seed oils to reduce manufacturing costs. The EVOO controversy peaked in 2015 when the National Consumer League released a report which found more than half of “EVOO” on shelves was mislabeled. In their test of 11 brands of olive oil from major grocery stores including Whole Foods, Trader Joes, Safeway, and Giant, only five proved to be real extra virgin olive oil—the other six failed to meet the quality standards set by the International Olive Council. Why does this matter? First of all, EVOO isn’t cheap. If you’re paying for a high-quality product, you want to make sure you’re actually getting a high-quality product that tastes fresh. But secondly, degraded or diluted olive oil isn’t as healthy. Here’s why: The health benefits of olive oil Olive oil has amazing health benefits. It’s an anti-inflammatory . It contains oleocanthal (an antioxidant that acts like a natural ibuprofen). It’s associated with less belly fat . It reduces the risk of heart disease . It reduces the risk of type 2 diabetes . It may help prevent cancer . It may decrease the risk of developing Alzheimer’s . Of all the olive oils you can consume, EVOO is the healthiest. The minimal processing means it retains more nutrients—including the antioxidants and vitamins that help deliver the above benefits. What I’m doing for my own body when it comes to EVOO Like I said, I think of EVOO as a supplement. I literally will drink a tablespoon full of my favorite EVOO, put it in a smoothie, or add it to my salads and veggies. I try to get some in every day. These days, I’m a super fan of the brand Kosterina, which was founded by a Parsley patient named Katina Mountanos. Her experience as a member was so profoundly transformative for her health that it helped inspire a career change—and a really great Greek olive oil. In addition to being pure EVOO, I like Kosterina’s olive oil because their olives are minimally processed and harvested from an organic farm. It tastes great and the minimal processing means it retains a maximum amount of polyphenols (which are key to EVOO’s health benefits). What I recommend for you If you’re looking for a top olive oil, look for products labeled “extra virgin olive oil” or “EVOO” rather than simply “virgin” olive oil, or “light” olive oil. In addition to Kosterina, other brands that made the high-quality EVOO cut in a test by Consumer Reports this year are: Brightland Awake Extra Virgin Olive Oil Wonder Valley Extra Virgin Olive Oil Graza Sizzle Extra Virgin Olive Oil California Olive Ranch 100% California Medium Extra Virgin Olive Oil Recently brands like Kirkland from Costco have also gotten credit for having a higher quality EVOO at affordable prices, per Consumer Reports. Want to learn more about your heart and brain health? Get started with Parsley Health to test your Omega-3 index, inflammation levels, or key cholesterol markers like APO-B (along with over 100 functional biomarkers). You can get testing at any major lab that’s convenient for you. Use my personal code RBMDCREW for $100 off. Keep Reading Are seed oils toxic to your health? My personal Thanksgiving menu 10 nutrient-dense snacks I pack on-the-go Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Should you get a SIBO test?
URL: https://www.robinberzinmd.com/should-you-get-a-sibo-test/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: SIBO is responsible for everything from bloating to brain fog to skin rashes. And it’s wildly under-diagnosed.
There are two kinds of people in the world right now. Those who have never heard of SIBO, and those whose newest TikTok obsession revolves around it. Robin’s Short Version Beyond the Gut: SIBO can trigger rosacea, brain fog, joint pain, and mood swings—symptoms most doctors never link back to the small intestine. Antibiotics Aren’t Enough: A short antibiotic course frequently leads to SIBO returning; lasting treatment requires a more comprehensive protocol than most GI doctors offer. Surprisingly Underdiagnosed: SIBO affects up to 22% of healthy adults and only received an official diagnosis code in 2023, meaning millions of cases go unrecognized. In med school, I was in the former camp. Small Intestinal Bacterial Overgrowth (SIBO) was never talked about. When I eventually learned about this gut health issue while studying functional medicine later in my career, it rocked my world. SIBO is responsible for everything from bloating to brain fog to skin rashes. And despite the fact that it’s massively on the rise, it’s still wildly under-diagnosed by the medical community (including gastroenterologists). In fact, SIBO only got an official diagnosis code—the codes we doctors use in medical records to document a patient’s illnesses—in 2023. (A big development for medical nerds like me—we cheered!) What is SIBO? SIBO (small intestinal bacterial overgrowth) is a bowel disorder caused by excess bacteria in the small intestine. (There are 3 types of it: methane-dominant, hydrogen-dominant and hydrogen sulfide-dominant!) It’s often the culprit behind common gut health symptoms including gas, bloating, diarrhea, abdominal pain, and nausea. It has similar symptoms to IBS (up to a third of people with IBS also have SIBO, according to one study ) and some studies even suggest SIBO might be a cause of IBS. But SIBO is sneaky. In addition to the gastro issues, it can also cause a range of symptoms that appear to have nothing to do with the gut: Rosacea (up to 46% of cases may be caused by SIBO, according to one study ) Brain fog Joint pain Headaches Fatigue Mood swings Despite the fact that SIBO can wreak havoc on several systems in the body, PCPs just aren’t trained to look for it. The TL;DR: SIBO is not something you want to get. So, even if you don’t have it, it’s important to understand how to prevent it. If you’re interested in gut health, have any unexplained symptoms, or want to know what I personally do to optimize my own gut health, read on! The research says Estimates vary based on the source and the type of diagnostic test used, but it’s assumed SIBO affects anywhere from 2% to 22% of healthy adults. At Parsley, our data shows that the condition is an issue for up to 25% of patients with GI issues. Why is SIBO on the rise? There’s likely a multitude of factors at play here. Non-invasive breath testing has made SIBO easier to diagnose and an increased awareness of gut health has contributed to more patients asking their doctors about testing. Some studies suggest a link between stress, anxiety, and SIBO (though a lot more research is needed to prove causality). High-sugar diets and the overuse of antibiotics , both of which disrupt the balance of bacteria in your gut, may also contribute to the rise in cases in recent years. How we treat SIBO The good news is that SIBO is very treatable—with the right protocol. At Parsley, we’ve developed the best, most tried and true SIBO treatment plan available. We brought our collective clinical expertise to the problem and partnered with the world’s top experts in SIBO (including all-star gastroenterologists like Dr. Allison Siebecker ) to craft what I believe is the world’s most effective treatment protocol for SIBO in all its forms. Treating SIBO is one of those things that is wildly gratifying and so challenging at the same time. We see patients every day who were given two weeks of antibiotics by a well-meaning gastro, whose SIBO came right back; people who have been struggling with GI issues like IBS for years and never had anyone even test for it; and people who have non-GI symptoms that stymied doctors who didn’t know how to connect the dots across the body to uncover SIBO as the root cause. At Parsley, I get to work with some of the toughest cases of SIBO, where even our protocol requires a couple of rounds of treatment to truly nip it in the bud. But the results can be astounding. I had one patient who had sharp abdominal pains referring to her back for years—we treated her SIBO and the pains resolved in two weeks. I had another patient with horrible acid reflux no matter what she ate, dependent on acid blockers, and suffering from persistent brain fog. We diagnosed her SIBO, treated it over a three month period with a combination of antibiotics and herbs, and her reflux and brain fog totally resolved. And I had another patient who couldn’t tolerate any form of raw veggies (and barely could handle cooked ones like broccoli and cabbage). When we treated his SIBO, his whole diet transformed—I’ve never seen anyone so happy about a Brussels sprout in my life! What I’m doing for my own body I don’t personally have SIBO—and I take care to keep it that way by prioritizing gut health with the following choices: I take a probiotic every night (This way, those good bugs can hit my gut in a rested state when I’m not actively eating.) I avoid refined carbs and foods high in sugar (I aim for less than 25g of sugar—including both natural and refined—per day.) I exercise in the form of yoga, pilates, and strength training (At least 3x a week.) I take frequent mid-day walk breaks ( Studies show regular movement has a significant impact on your gut microbiome and gut physiology.) I avoid unnecessary antibiotics and keep alcohol consumption to a minimum (Both are microbiome disruptors!) I meditate for 15 minutes every morning (For me, stress and slow digestion go hand in hand. When I de-stress through regular meditation, my gut motility is optimal.) What I recommend for you Should you get tested for SIBO? Whenever a patient complains of IBS-like symptoms, or says something along the lines of, “My stomach is flat in the morning but by nighttime, I feel and look like I’m six months pregnant,” I suspect SIBO. If you’re regularly experiencing any of the following symptoms, I recommend coming to Parsley or talking to your PCP: Bloating Nausea Chronic constipation or diarrhea Acid reflux Gas Unexplained weight loss If you’re experiencing the above, come talk to one of our experts at Parsley . We’ve developed a best-in-class SIBO testing and treatment plan to address your symptoms. Use my personal code RBMDCREW for $100 off your membership. AND! If you want to learn more about how critical gut health is to your overall well being, I have big news! I’m launching a live course on the subject. Healing Your Gut Through the Mind and Body begins on October 23. Space is limited so secure your spot now ! Keep Reading Bloating and brain fog? You’re probably low in butyrate. What is your vaginal microbiome telling you? Can You Really Eat Your Way to A Better Mood? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## What is your vaginal microbiome telling you?
URL: https://www.robinberzinmd.com/what-is-your-vaginal-microbiome-telling-you/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: The vaginal microbiome is a dynamic ecosystem and a key driver of gynecological, urogenital, and reproductive health.
I’ll never forget when I worked for Dr. Oz back in 2005 and he got a question on his radio show from a caller on douching (which, I would realize years later, was really a question about the vaginal microbiome). What he said would bring him attention for decades to come. Don’t douche! The vagina is a self-cleaning oven. Robin’s Short Version Diversity Is Bad: Unlike the gut, a healthy vaginal microbiome is dominated by L. crispatus—more bacterial diversity signals worse outcomes. pH Is Defense: L. crispatus produces lactic acid to hold vaginal pH between 3.8–5, actively blocking the growth of harmful organisms. Check Your Lube: Lubricants with chlorhexidine gluconate harm healthy lactobacillus—choose one formulated to match vaginal pH. He was right. Don’t douche. But what we didn’t fully understand then is the role the microbiome plays in overall vaginal health, defining exactly why the vagina is in fact a self-cleaning oven. The medical community has spent a ton of time talking about the gut microbiome but lately I’ve been super interested in how our health is impacted and supported by the other microbiomes that get less airtime. Think: the skin microbiome (which I’ll cover in a future newsletter) and yes, the vaginal microbiome. I thought of this self-cleaning oven moment recently when I attended a launch event for my friends at Seed (who I’m partnering with on content this fall, including this newsletter) which just launched a new probiotic designed to support the vaginal microbiome. If you have a vagina—Or care about someone who does!—you may find it as fascinating as I have to dive into the bacterial ecosystem important for everything from supporting vaginal immunity, to odor, to lubrication. Read on for the research and what I’m personally doing to make sure all my microbiomes are as healthy, vibrant, and resilient as possible. The research says The vaginal microbiome is a dynamic ecosystem and a key driver of gynecological, urogenital, and reproductive health. Activities like douching disrupt that ecosystem, causing an overgrowth of potentially harmful bacteria that can lead to all kinds of uro-gynecological health issues. Yet—despite Dr. Oz’s self-cleaning PSAs—nearly 20% of women still do it, according to the U.S. Office on Women’s Health . The optimal vaginal ecosystem A healthy vaginal pH level is between 3.8 and 5 (slightly acidic, like a tomato), according to a 2021 study . The optimal vaginal microbiome is also dominated by a superabundance of one type of bacteria— Lactobacillus Crispatus —which is associated with favorable health outcomes. Put another way, bacterial diversity here is bad. Ideally, L. crispatus runs the show. As far as good bacteria go, L. crispatus is a super-defender. It produces lactic acid to keep vaginal pH in balance and limit the growth of potentially harmful organisms. The vaginal microbiome out of balance Just like your gut microbiome, the vaginal microbiome is malleable and easily influenced—lots of seemingly innocuous things can alter the balance. Beyond douching—any product that comes into contact with the vagina can impact the microbiome. Take lube, for example. Lubricant can not only impact the pH balance of the vagina (which is why it’s important to choose a lube that matches vaginal pH), but have antimicrobial effects. (Which is bad for a micro biome. ) Lube containing chlorhexidine gluconate is particularly bad for the growth of healthy lactobacillus , according to a 2021 in vitro study . A lot of normal daily activities can impede the ability of L. crispatus to thrive. Recent research shows: Sexual activity including oral sex and using sex toys can increase the presence of non-optimal vaginal bacteria L. iners and Gardnerella vaginalis Intense exercise can increase diversity of bacteria in the vaginal microbiome A vegetarian diet can lead to a loss of lactobacillus Menstruation can cause imbalances in the vaginal microbiome Menstrual pads can negatively impact L. crispatus levels (while menstrual cups have been positively associated with the presence of L. crispatus ) What I’m doing for my own body This doesn’t mean you should stop doing cardio or having sex. For optimal vaginal health, I employ a one-two punch of avoiding behaviors that are detrimental (within reason) and making choices that help boost my beneficial bacteria. Follow a low-sugar diet. Sugar feeds yeast. I aim for less than 25g of sugar per day. Take a probiotic. Recent research suggests taking a regular oral probiotic likely doesn’t benefit the vaginal microbiome. I personally take Parsley’s probiotic every night for optimal gut health. For patients struggling with uro-gynecological issues, I sometimes recommend Fem-dophilus . Never douche! Dr. Oz had it right. Hopefully we all know this by now. Avoid scented soaps and tampons. You may have seen the headlines about heavy metals in tampons . Consider this another reason to consider what products you put into your vagina. Choose the right lubricant. The World Health Organization recommends using a lubricant with a pH of 4.5. I recommend water-based lubricants—they won’t damage the vaginal microbiome over time, according to a small study of postmenopausal women. What I recommend for you Given the delicacy of the vaginal microbiome and its importance to health, I was genuinely excited when I learned about the VS-01™ Vaginal Synbiotic from our friends and partners at Seed. VS-01™ is the first clinically validated vaginal probiotic suppository formulated with three proprietary L. crispatus strains. It was developed from over 15 years of breakthrough vaginal microbiome research to restore a healthy vaginal microbiome, maintain vaginal pH, and is safe and well tolerated. Use my personal code DRROBIN25 for 25% off your order! Looking for a personalized plan to address imbalances in your microbiome? Come talk to one of our experts at Parsley . Use my personal code RBMDCREW for $100 off your membership. Keep Reading MTHFR mutations can cause anxiety, fatigue and fertility issues. You likely have one. Fertility Over 35: 8 Evidence-Backed Levers 100 Essential Labs Every Woman Should Be Tracking Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to boost your immune system before it fails
URL: https://www.robinberzinmd.com/boost-your-immune-system/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Can you really boost your immune system with diet and exercise? Here’s what I’m doing to fortify myself for cold and flu season.
I avoid illness at all costs. No one likes being sick (obviously) but I’m entering a particularly busy season—prepping for my first live course launching October 23 , hitting the road to deliver a big keynote speech this fall, running things at Parsley Health, and managing back-to-school craziness with my three kids. I often feel like I can’t afford to get sick. And who can, really? Between our family responsibilities, work schedules, passion projects, health goals, and whatever else keeps you busy, getting benched with a cold or the flu isn’t just annoying, it’s stressful. In this season of life, I want to do everything I can to help you boost your immune system. Robin’s Short Version Hand Hygiene Works: Regular handwashing alone can reduce your risk of catching a cold by up to 21%. Gut Runs Defense: 70% of your immune system lives in your gut, meaning diet directly shapes your white blood cell count and infection response. Sugar Has a Limit: Staying under 25g of sugar daily helps prevent dysbiosis, which weakens the gut lining and lets toxins enter the bloodstream. With cold and flu season officially underway, I’m amping up my handwashing (which reduces your risk of getting a cold by up to 21%) and doing everything I can to limit my exposure to germs. Equally important, I’m doing everything I can to support my immune system. If I can’t afford for my immune system to fail me this season, I can’t fail it. And neither can you. Let’s get through this cold and flu season together! The research says First, a quick bio lesson. There are two pillars to the immune system: innate immunity and adaptive immunity. Innate immunity: What you’re born with Includes physical barriers like your skin and mucous membranes Responds the same way to all foreign invaders Adaptive immunity: Launches a specific response to foreign invaders like viruses and bacteria Slower to respond, but more accurate The immune system is influenced by a delicate ecosystem of factors: Gut health. Trashing your microbiome via a diet rich in ultra-processed foods and refined sugars can lead to dysbiosis, which weakens the lining of the gut and allows toxins to leak into the bloodstream. Diet . While junk food weakens your gut microbiome, eating a diet rich in fermented foods, healthy fats, and antioxidant-rich fruits and veggies can help support immune function by feeding immune cells with micro and macronutrients. Stress . The impact of stress on your immune system is complex. In short bursts, the stress hormone cortisol can trigger a boost in immune function by limiting inflammation. Chronic stress is a different story. Long-term exposure to stress decreases white blood cell count, limiting the body’s ability to fight infection. Sleep. Chronic insomnia increases stress hormones, promotes inflammation, and increases your vulnerability to infections. Exercise. There are several mechanisms by which exercise supports immune function, including by reducing stress and inflammation. Alcohol consumption. Chronic alcohol lowers the immune system’s ability to fight off infections from bacteria and viruses. Over time, it also increases the body’s susceptibility to cancer. What I’m doing for my own body As a doctor and a mom of littles, I am extremely conscious of making sure that my immune system is fortified and ready to fight off the onslaught of germs that I encounter daily. That starts with prioritizing gut health given 70% of your immune system lies in your gut. What you choose to put in your body impacts your gut microbiome, gut barrier function, inflammatory response and white blood cell count. All of these things have a meaningful impact on immune function. I avoid ultra-processed foods and snacks at all costs and aim for less than 25g of sugar per day for so many reasons including reducing inflammation. During cold and flu season, I also pay special attention to eating foods linked to immune function. Fermented foods like kimchi and yogurt contain probiotic bacteria, which not only support general gut health, but also may help squash viral infections by preventing viruses from attaching to host cells and increasing production of pro-inflammatory cytokines. Antiviral herbs like oregano , peppermint , fennel , and tea have long been used for their medicinal properties. I’ll work oregano and fennel in while I’m cooking and drink a peppermint tea once a day. Vitamin C, vitamin D, and zinc are the micronutrients with the strongest evidence for immune support. I reach for bell peppers (3x the vitamin C of an orange), legumes (high in protein, fiber, and zinc) and fatty fish (for protein and vitamin D). For most of us getting enough sleep is a struggle. But it’s a pillar of immune function. Studies show that if you regularly get less than seven hours of sleep, you may be three times as likely to catch a cold. I make it a priority to make sure I’m winding down by 10 p.m. every night. Finally, I prioritize exercising at least three (ideally five) days per week. Yoga and pilates classes are a regular stress reliever for me but high-intensity exercise can also be beneficial for immune function as it raises white blood cell count. I work in high-intensity classes like Session Training even though it intimidates me. What I recommend for you To stay healthy this season, start by building a baseline of immune strength with these steps: Sleep. Get a minimum of 7 hours per night. Meditate. Meditating for 15 minutes a day (even if I have to take it on the go with a walking meditation after I drop off my kids) is a key part of the way I keep my situational stress from becoming chronic stress. Exercise. Aim for 3 high-intensity sessions per week. Avoid ultra-processed foods. They are not only slowly killing you, but also making you more likely to get sick. Take a daily probiotic . It’s the easiest way to support gut health and gut barrier function. I also avoid unnecessary antibiotics and only drink alcohol occasionally since both are microbiome disruptors. Want to learn more about building a resilient gut? Sign up for my first-ever live course Healing Your Gut Through Mind & Body , which begins October 23. Over three intimate sessions, you’ll gain a deeper understanding of how foundational the gut is to your health and start healing your gut in real time. Keep Reading Bloating and brain fog? You’re probably low in butyrate. Omega-3 deficiency is as harmful as smoking My personal supplement stack. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to reduce stress in 15-minutes
URL: https://www.robinberzinmd.com/how-to-reduce-stress/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: Chronic stress increases risk of diabetes, cardiovascular disease, and Alzheimer’s. But too often we brush it off. Here’s how to reduce stress.
Just when I think I have it under control, I realize that I’ve overcommitted. I’m in the middle of teaching my live course on improving mind and gut health in real time , still recovering from the craziness of Halloween with three kids—the costumes, the sugar crashes, and the pressing question of how to get the leftover three pounds of candy out of my house—and I also traveled to give a keynote speech on how to take care of your Brain, Bones, and Booty at the Eudemonia Summit last weekend. Robin’s Short Version Chronic Stress Compounds: Chronic stress raises cardiovascular disease risk by 40–60% and makes you 2.5x more likely to develop Alzheimer’s. Stress Shows Physically: Sleep disruption, bloating, skin flares, and headaches are signs your fight-or-flight system is chronically stuck in overdrive. Vagus Nerve Is Key: High vagal tone shifts your body into rest-and-digest mode — the only state where stress-related damage can actually be repaired. Through it all, I’ve also been dealing with election stress, which is no doubt weighing on all of our minds as we find ourselves glued to the news this week. Stress is a vital sign, but too often we brush it off—it’s sometimes easier to keep barreling through our to-do lists and newsfeeds than it is to face the anxiety and burnout head-on. But being under chronic stress is a bit like being the proverbial frog in the boiling water. As humans, we can only tolerate so much heat. When things boil over, our systems start to break: Sleep: You can’t fall asleep, can’t stay asleep, don’t feel rested, or have persistent brain fog Digestion: Bloating, reflux, and constipation are all signs of a fight or flight response in overdrive Rashes and breakouts: One of the top reasons people have rosacea, acne, or psoriasis flares is stress Headaches: Stress is a common trigger for migraines and tension headaches So how to reduce stress—especially during a week like this one? Here are the science-backed strategies I turn to to temper acute stress and combat chronic stress. The research says Stress triggers a hormonal response in your body. As your adrenals release adrenaline and cortisol, your heart rate, blood pressure, and blood glucose all rise. In the presence of an acute threat—like a car swerving into your lane—this adaptive response is helpful. Adrenaline makes your heart beat faster, pumping blood through your veins at an increased rate to give you more energy and increase reaction time. Cortisol prompts your body to release more sugar into your blood, making more glucose available to fuel brain function. Most of the stress we experience in our modern life, however, isn’t acute, it’s chronic. Over time these physiological changes create heightened risk of diseases and chronic conditions including: 20% increased risk of developing diabetes 40-60% increased risk of developing cardiovascular disease 2.5x more likely to develop Alzheimer’s Chronic stress is also a driver of anxiety and depression: Of adults who say they experience chronic stress, 51% also report symptoms of depression and 61% report symptoms of anxiety . In this way, chronic stress may contribute to the development of IBS: 38% of IBS patients have anxiety and 27% have depression —double the rate of anxiety and depression in the general population. Researchers suspect that this relationship is bidirectional. What I’m doing for my own body At the Eudemonia Summit I was excited to check out new tech like Ammortal (full-body red light therapy, pulsed electromagnetic field therapy, vibroacoustic sound therapy, plus hydrogen inhalation therapy), ShiftWave (pulsed pressure wave therapy) and Apollo (a wearable that helps regulate heart rate variability). All of these gadgets are designed to reset our nervous systems through stimulation of the vagus nerve , which controls relaxation response and plays a key role in the gut-brain axis, digestion, overeating, and inflammation. This matters because it is only when we are in a state of high vagal tone—i.e. Rest, Digest, Relax, and Heal—that our bodies can be in a healing state and repair those broken systems. It’s easy to write off this type of tech as “nice to have” but when we are all boiling over it can actually be, if not life saving, certainly health saving. I got out of Ammortal for 30 min and felt like I had a new brain—my entire nervous system shifted into a lower gear and my sense of relaxation was profound. But since I can’t live in an Ammortal chamber and tech like this isn’t always easily accessible, I prioritize habits that 1) reduce my levels of chronic stress and 2) stimulate my vagus nerve: Meditation I talk about meditation a lot because it’s proven. After 40 days of adopting a mediation practice, researchers found changes in participants brain’s structure (cortical thickness) and functional capacity that lower anxiety and depression. This is one of the many reasons we prescribe meditation to almost all of Parsley’s 40,000 patients. High Intensity Interval Training (HIIT) Exercise is one of the most powerful stress modulators available to us. HIIT in particular has been shown to not just decrease stress and anxiety, but increase resilience. At Eudemonia, I learned that as little as three 1-min sprints (run or bike or row) twice a week improves cognitive velocity (curiosity, creativity, and brain mitochondrial function). Admittedly, I get off track with my HIIT workouts, but every time I do them, I feel the endorphin rush and the impact on my brain health. Yoga nidra Sometimes called non-sleep deep rest, yoga nidra is the deeply meditative state of consciousness between sleep and wakefulness that you’re aiming to achieve in savasana (corpse pose) at the end of a yoga class. At Eudemonia, Andrew Huberman talked about how great this practice is for the basal ganglia, part of the brain involved in several cognitive processes including emotional regulation. Supplements I take a magnesium supplement to help prevent magnesium deficiency, which can increase the body’s susceptibility to stress. I also take a lion’s mane supplement. Some research suggests these mushroom derived supplements can reduce stress levels after 28 days. I like Host Defense . What I recommend for you The above practices will help you reduce chronic stress. Here are my top science-backed strategies to reduce stress right now : Take a 10-minute walk. If you’re stressed, my number one recommendation is to get up and move. Research shows even a brisk 10 minute walk can significantly improve mood state (including feelings of depression, dejection, and anger). Meditate for 15 minutes. You may think meditation is not your thing (I did) but trust me on this. Take it on-the-go and do a walking meditation by simply bringing your attention to the moment and focusing on your breath to keep your mind grounded in the present (i.e. the color of the trees, the smell of the air, etc.). Sit outside. Research shows the positive emotions evoked by spending time in nature can increase vagal tone . Watch something funny. This may seem trite but a 2022 study found that laughing calms the vagus nerve. Singing can also lower stress levels via a similar mechanism, per another 2022 study . Wondering how chronic stress might be impacting your health? Take Parsley’s free quiz and let’s start getting to the root cause of your symptoms. Want to chat in person? I’ll be going deeper on the impacts of chronic stress for longevity at Luminescence , a one-day summit in LA in February. Get your ticket here . Keep Reading The Cortisol Reset Every Woman Needs The best “calm tech” to hack your vagus nerve Is Sleep Consistency the Most Overlooked Lever of Longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My personal Thanksgiving menu
URL: https://www.robinberzinmd.com/my-personal-thanksgiving-menu/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I don’t buy into the idea that you have to choose between enjoyment and health — especially at Thanksgiving. Here’s my actual menu and how I make it work
I don’t buy into the message that it’s either pleasure or health—especially when it comes to my Thanksgiving menu. Robin’s Short Version The 2:1 Rule: Pair every indulgent dish with two foods high in fiber, protein, or healthy fat to blunt blood sugar spikes. Veggie-First Strategy: Eating vegetables before carbs delays stomach emptying, lowering post-meal glucose and insulin levels. Holiday Calorie Reality: A single Thanksgiving meal can reach 3,000 calories—50% more than a full day’s recommended intake. This time of year is full of health fear-mongering—which isn’t totally unreasonable. The majority of the weight the average American gains over the course of a year happens during the holidays . And it starts this week; aThanksgiving feast can easily total 3,000 calories —50% more than the average person should be consuming in an entire day. I don’t say this to shame you into gnawing on celery sticks this week. The road to longevity is built on habits that will last decades, not days, and that means allowing yourself the occasional indulgence. If you look forward to your Aunt’s pumpkin pie all year, have it. My personal Thanksgiving protocol is to follow what I call the 2:1 plan: I balance every high-carb, high-sugar, or calorie-dense dish with two healthy foods (like fiber-rich veggies, lean protein, and healthy fats with omega-3s). For me, pleasure and health go together—especially during the holidays. You do not have to forgo your favorites to have a meal that is both delicious and doesn’t send your blood glucose on a rollercoaster, trigger inflammation, and leave you feeling bloated and groggy all weekend. This year, my family is hosting and we’re going to be cooking a few recipes from The Four Horsemen: Food and Wine for Good Times , the cookbook from one of my favorite restaurants in my neighborhood. (This celery salad with dates recipe is addictive and their pumpkin pasta would make a great mac and cheese alternative full of fiber and vitamins A and C.) Here’s what I recommend eating (and enjoying!) this week. What I’m doing for my own body Follow the 2:1 rule The composition of your overall meal is more important than individual foods when it comes to the impact on your body. Pairing carbs with fiber, protein, and fat triggers a lower blood sugar response than eating carbs alone, for example. So if I’m going to eat something sugary I pair it with two healthy dishes high in fiber, protein, or healthy fat. Some examples of how that might look for your Thanksgiving menu: Candied yams + organic free-range white meat turkey & green beans sauteed with EVOO, garlic and lemon Stuffing + chicory salad with shaved pears and hazelnuts & roasted cauliflower tossed with pomegranate seeds Eat a veggie starter Studies show that eating vegetables before carbohydrates significantly decreases postprandial glucose and insulin levels. The leading theory is that eating this way delays stomach emptying, slowing the absorption of sugar into the blood stream. I eat my veggies before the carbs on my plate to avoid the energy crash that comes after a big spike in blood glucose and support long-term blood sugar control. Make healthy alternatives a sport It’s always a struggle to find the time to try a new healthy recipe so I view the holidays as an opportunity to practice cooking in a healthy way for my family. My Thanksgiving menu includes turkey (I’m not a big fan, but it makes the table) and pumpkin pie, but I’m also planning to serve a seafood dish—herbed wild slow roasted salmon—for a protein alternative high in healthy fats, a big fiber-rich chicory salad, and a huge pan of cauliflower roasted with a high-quality EVOO . This year I’m also making a gluten-free, dairy-free pumpkin pie . To support the 2:1 rule, I’ll also have a collection of healthy sides and snacks on my Thanksgiving menu including: Toasted walnuts and almonds (high in omega-3s and omega-6s) Gluten-free sourdough bread (sourdough produces a more stable blood sugar response than traditional bread) Gluten-free quinoa stuffing (lower in carbs than traditional stuffing and a complete protein source) Cucumbers with fennel, herbs, and buckwheat (high in fiber to help with digestion and bloating) Fast and sweat The morning after a big calorie-dense meal, I immediately target that bloated, heavy feeling with a long morning fast and sweaty yoga or sauna session. What I recommend for you In addition to the above, these 4 things are proven to reduce inflammation, speed up digestion, and curb bloating: Move after your meal. It is so critical to move your body after a big meal. Walking for as little as 2-5 minutes after a meal can lower your blood sugar, according to a 2022 study published in the Journal of Sports Medicine . Exercise. A vast body of research supports the anti-inflammatory effect of regular exercise. Studies suggest that the inflammation triggered in your muscles when you exercise prompts the body to release more inflammation-countering T-cells, which help fight the chronic inflammation that can fuel auto-immune disease. It’s okay to take a couple of days off around the holidays. But prioritize getting back to your regular exercise routine on Monday. Load up on anti-inflammatory foods. Anti-inflammatory foods, like whole grains, leafy greens, and fruit, are mainstays of a longevity diet. In the days following a particularly inflammatory meal, avoid alcohol and easily-digestable starches, which can fuel inflammation, in favor of a few veggie-heavy, alcohol-free detox days. Feed your gut. Sugar-rich foods (like cranberry sauce, candied yams, and pecan pie) feed harmful bacteria in your gut and can throw your microbiome out of balance, which can cause everything from brain fog to constipation. To restore balance, spend the rest of the weekend eating high-fiber foods (broccoli, brussels sprouts, and whole grains), prebiotic foods (watermelon, grapefruit, pomegranate), and probiotic foods (yogurt, pickles, sauerkraut). And if you’re not already, take a probiotic . If you’re ready to learn more about how critical gut health is to your mental function and digestive function, download my pre-recorded course Healing Your Gut Through Mind and Body . Keep Reading 10 nutrient-dense snacks I pack on-the-go How Much Protein Should You Really Be Eating? Are seed oils toxic to your health? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Rich Roll and I get to the root of your “feel like crap”syndrome
URL: https://www.robinberzinmd.com/rich-roll-and-i-get-to-the-root-of-your-feel-like-crap-syndrome/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: If you’ve ever dipped a toe into the worlds of biohacking, veganism, or ultra-endurance sports, you know Rich Roll—the bestselling author and hugely popula
If you’ve ever dipped a toe into the worlds of biohacking, veganism, or ultra-endurance sports, you know Rich Roll—the bestselling author and hugely popular podcaster. I know Rich from way back (before the wellness movement was a movement!) and I was so excited to catch up with him in LA this fall for a recent episode of his podcast . Robin’s Short Version Sushi Spikes Sugar: Despite its healthy reputation, sushi is one of the highest blood sugar-spiking meals you can eat. Fix Your Fat Ratio: Americans eat a 20:1 ratio of Omega-6 to Omega-3 fats; the target is 1:1, and the imbalance drives gut and immune damage. Diet Shapes Your Gut: Americans consume 60 pounds of added sugar yearly and 75% of the U.S. food supply is ultra-processed, decimating the microbiome. We chatted for over two hours about so many of the things I know people in this community are all passionate about: how the American healthcare system has become the American sickcare system the future of health data how to look and feel as good in the second half of your life as you did in the first I see so many women (and men) with joint pain, weight gain, brain fog, GI symptoms—usually with few explanations and a long list of meds. And because our healthcare system is so transactional and fast, there’s no time in a typical 10-minute primary care visit to put the pieces together. Women will go years with an undiagnosed autoimmune disease that—with the right treatment and lifestyle changes—can actually be reversed. That’s exactly why I started Parsley Health ; to put patients back in control of their health and get to the root cause of what I call FLC—“feel like crap”—syndrome. I hope you’ll listen to the episode to hear our full conversation . In the meantime, here are 5 takeaways from our chat to inspire some action and get you on track as you think about your health goals for the year ahead. Sushi is one of the highest blood sugar spiking meals you can eat. Sad but true—and something I only learned after tracking my blood glucose with a continuous glucose monitor (CGM). Getting this kind of easily accessible, real-time data about our bodies is the future of health. Be proactive about testing and collect as much data on your body as you can—if you haven’t tried a CGM, start by getting your A1C checked twice a year to monitor metabolic health. (I’m planning a newsletter for early next year about exactly what you should be tracking and—importantly—what to do with that data. Stay tuned!) We are all battling gut dysbiosis. We take antibiotics, we consume 60 pounds of added sugar per year, and nearly 75% of the food supply in the U.S. is ultra-processed frankenfoods. Everyone always asks me about probiotics (you should take one !) but the truth is what you eat every day defines who lives and who dies in your gut. What we put in our mouths is the number one driver of gut health. If you want to learn more about how critical gut health is to your mental function and digestive function—and actually do something about it in real-time—download my pre-recorded course Healing Your Gut Through Mind and Body . It’s not enough to eat less of the bad stuff—you need to eat more of the good stuff. Some biohackers profess that “a calorie is a calorie.” I deeply disagree. If the only thing in your life that matters is metabolism and weight, yes, a “calories in, calories out” approach can be effective. This is how so many people (temporarily) lose weight on GLP-1s—by eating less of the crap they were eating before. When we think about overall health and well-being—cognitive function, bone health, the composition of your body, and your ability to live your life—no, a calorie is not a calorie. If you’re fueling your body with toxic inflammatory fats (Americans eat a more than 20:1 ratio of Omega-6 to Omega-3 fatty acids, mostly from inflammatory seed oils , when we should be eating a 1:1 ratio), you are attacking your gut microbiome and creating immune system disarray. If you don’t get the foundations right, none of the extras will matter. Stem cell therapy, exosomes, peptides , HVOT…none of these“extras” will replace the basics. You cannot live on fast food, have a sedentary lifestyle, never exercise, and doomscroll into the night and expect these types of therapeutics to cure all your symptoms. To be clear, some of these therapeutics are backed by really promising research. But I’ve rarely seen a shortcut work in the long run. Take peptides for example. Most peptides have not been studied as drugs, and while there is promising early research on the use of peptides for diabetes, Alzheimer’s disease , inflammatory diseases , and even sexual dysfunction , the jury is still out. (I do take 10g of marine collagen and 5g of creatine , but I don’t expect either of those things to replace my diet or exercise.) HRT isn’t the only answer. I’m a big fan of HRT—I think we’re prescribing it too little and too late. But HRT alone is not enough to keep you from feeling like crap as you age. I’ve been talking a lot lately about my Brains, Bones, Booty Protocol , which addresses not only preventing dementia, osteoporosis, and sarcopenia, but how to take the opportunity to double down on your health in your 40s and beyond. By taking care of your brain health ( omega-3 fatty acids, methylated B vitamins, zone 2 cardio, meditation ), bone health ( high-impact exercise, strength training, foods high in calcium, potassium, and zinc ) and metabolic health ( 1g of protein per pound of body weight per day ) you set yourself up to avoid all the things that women are told are inevitable. Weight gain, brain fog, exhaustion, and bone density depletion do not have to be your future. If you’re ready for more personalized support in getting to the root cause of your FLC syndrome, chronic symptoms, or want an action plan for how to look and feel your best in mid-life, set up a free consult call with Parsley today and use code RBMDCREW for $150 off your membership. Keep Reading Functional medicine changed my life. 100 Essential Labs Every Woman Should Be Tracking Bloating and brain fog? You’re probably low in butyrate. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Functional medicine changed my life.
URL: https://www.robinberzinmd.com/functional-medicine-changed-my-life/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: I met functional medicine guru Dr. Mark Hyman before I went to med school. I’ll never forget what he told me: “Don’t get brainwashed.”
I was really lucky to learn about functional medicine early in my career. I met Dr. Mark Hyman before I went to med school at Columbia and I’ll never forget what he told me: “Don’t get brainwashed.” Robin’s Short Version Dots Get Connected: Your brain fog may stem from gut dysfunction, and a nutrient deficiency may trace back to low thyroid function—links conventional medicine isn’t trained to make. The Numbers Are Real: Parsley patients saw a 65–75% decrease in medication usage and a 31% improvement in autoimmune symptoms within their first year of root-cause care. Women’s Health Wins: 88% of patients improved or resolved menopause symptoms in year one, and 48% of those with prior infertility who were trying to conceive succeeded. The Protocol in Brief Root cause over symptom management: Functional medicine uses advanced diagnostics — hormones, gut health, inflammation, nutrients — to find why you feel the way you feel, not just mask it with medication. The data is real: Parsley patients saw a 65–75% decrease in medication usage and a 31% improvement in autoimmune symptoms within their first year of care. Women especially benefit: 88% of Parsley patients improved or resolved menopause symptoms in year one. 48% of members with prior infertility history who were trying to conceive were successful. By the time I was a resident in Internal Medicine at Mount Sinai Hospital in New York City, I fully understood what he meant. The root cause of your brain fog might be in your gut; a nutrient deficiency might be the result of low thyroid function. But regular doctors are trained to point out disease—not to connect the dots between body systems. Functional medicine treats the body like an ecosystem, getting to the root cause of symptoms. The healthcare system I saw during residency was designed to treat disease rather than to generate health. And that hasn’t changed much. People are getting sicker and sicker, taking more and more pills to match a growing list of symptoms. Ninety percent of healthcare costs today are driven by chronic conditions including mental health. [1] As a functional medicine practitioner, I’m interested in: preventing and reversing chronic conditions identifying the root cause addressing symptoms through a wider range of tools including food as medicine, nutraceutical supplements, and exercise in addition to medications I’m interested not just in treating disease, but in optimizing health . This mission eventually turned into Parsley Health . It’s also the foundation of the work we are doing here as a community. I’m so excited about what we are going to do together in 2025! Here’s a taste of what to expect in upcoming newsletters : A comprehensive preventative health checklist A deep dive into plant medicine An exploration of the ways inflammation is sabotaging your health goals A customizable longevity plan for your brain, bones, and booty And so much more! If you want to start the year off strong, find a functional medicine practitioner. I promise you, it will make all the difference! The functional medicine difference Medications and surgery are life-changing and life-saving but traditional medicine usually fails to see symptoms as part of a bigger health ecosystem. Functional medicine uses highly personalized holistic protocols to treat the root cause of your symptoms based on your personal genetic, biochemical, and lifestyle factors. A functional medicine practitioner takes the time to understand the whole picture of your health; we look at lifestyle factors (diet, exercise, sleep, stress) and use advanced diagnostic tests (hormone imbalances, gut health, immune health, inflammation, nutrient imbalances) to understand how your biology and environment impact your health. Then we use that data to create a personalized plan for you to not just live longer, but actually feel better. To be clear, functional medicine is not against prescribing drugs (and neither am I). But they are not the only tool. Functional medicine looks to lifestyle modifications, nutrition, supplements, and other integrative therapies before or alongside conventional treatments. Here’s a few examples of how functional medicine treats common health concerns differently: Functional medicine is especially important for women Functional medicine isn’t a gender-specific approach—let’s be clear—but it is particularly well-suited to treating conditions that disproportionately affect women like: Chronic and autoimmune conditions Just under half of women (44%) have a chronic health condition that requires regular monitoring, medical care, or medication. [2] And nearly 80% of the approximately 24 million Americans diagnosed with an autoimmune condition are women. [3] By getting to the root cause and following individualized, data-driven protocols, Parsley patients saw a 65-75% decrease in medication usage, and within their first year, patients saw a 31% improvement in all autoimmune symptoms . Fertility One in five heterosexual women in the U.S. under 49 are unable to get pregnant after a year of trying, per the CDC. [4] Functional medicine treats hormone imbalances that impact fertility. At Parsley, 48% of members with a prior history of infertility who were trying to conceive, were successful . Menopause Forty percent of menopausal women say their symptoms interfered with their work performance or productivity weekly, and nearly one in five have quit or considered quitting because of their symptoms. [5] Using functional medicine protocols, 88% of Parsley patients improved or resolved their menopause symptoms within their first year of care . Isn’t it expensive? The thing that blew my mind when I was building Parsley was that this higher level of care can save patients (and the entire healthcare system) money by reducing the need for medications to manage chronic conditions. Parsley patients reduce their prescription drug usage by 65% on average. What to look for in a functional medicine practitioner Lots of start-ups offer the kind of diagnostic testing that functional medicine doctors use. So is it enough to order these labs yourself and bring it to your regular doc? Not really. Practicing functional medicine is like learning to read a different language. Your regular doctor can flag the basics but you won’t get the direction or insight into optimizing your health that a functional medicine doctor is trained to provide. Look for a doctor who is trained in root cause analysis and certified by the Institute for Functional Medicine . I built Parsley Health to take the guess work out of this process. Set up a free consult call with my team at Parsley today and take $150 off your membership when you sign up with the code RBMDCREW. Scientific References Chronic disease accounts for approximately 90% of U.S. healthcare spending. Centers for Disease Control and Prevention. ⚠️ Resolve Beehiiv tracking URL Women and chronic health conditions prevalence data. ⚠️ Resolve Beehiiv tracking URL Women represent ~80% of autoimmune disease diagnoses in the U.S. ⚠️ Resolve Beehiiv tracking URL National Survey of Family Growth. Infertility in the United States. Centers for Disease Control and Prevention. cdc.gov/nchs/nsfg Menopause and workplace impact survey data. ⚠️ Resolve Beehiiv tracking URL Keep Reading Your comprehensive preventative health checklist. 100 Essential Labs Every Woman Should Be Tracking Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights.
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## Your comprehensive preventative health checklist.
URL: https://www.robinberzinmd.com/your-comprehensive-preventative-health-checklist/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: If you’re not testing, you’re not learning. I lost my grandmother to a cancer that was entirely preventable. Here’s the full preventative health checkli
If you’re not testing, you’re not learning. In college, I lost my grandmother to colon cancer. She’d spent a lifetime eating the Standard American Diet—the SAD—and smoked in her adult life, which are both huge risk factors for cancer. Still, her death was totally preventable. She never got the screening that could have saved her life. Robin’s Short Version Screening Saves Lives: Only 8% of people get recommended preventive screenings yearly, even as early-onset cancer rose 79% globally since 1990. Test Your Interventions: Labs every six months confirm whether supplements, workouts, or dietary changes are actually shifting your biomarkers. 40s Demand Baselines: Blood sugar control weakens in your 40s regardless of diet, making hemoglobin A1c and hormone baselines critical to establish now. Her story became the lens through which I saw my medical training. Preventative testing is a pillar of functional medicine and key to helping us live our healthiest possible lives. Not only do preventative screenings help halt and reverse disease progression, they also help us optimize our health. People always ask me “How do I know if my supplements are working?” and “How can I tell if my workouts are really improving my metabolism?” My answer is simple: if you’re not testing, you don’t know. Lucky for you, I’ve put together a complete checklist of the tests you should be getting at least every year and ideally every six months (unless otherwise noted). More good news: Parsley now tests 84 biomarkers as part of the The Parsley Functional Lab Panel offered to all members.* We use those insights to order advanced specialty tests tailored to your biology. Use this checklist like a Bible and refer back to it often with your doctor to keep tabs on your health, track progress, and test whether the interventions you’ve adopted are working. A lot can change in your body in six months—make sure those changes are positive. The research says Only 8% of people annually get the preventive screenings they should. That is insane to me, considering early onset cancer is on the rise globally—by as much as 79% between 1990 and 2019, according to one study. Rates of chronic disease like metabolic syndrome and diabetes, autoimmune conditions, and deaths from cardiovascular disease, meanwhile, are also on the rise. The best way to treat chronic disease is to prevent it. And the best way to prevent it, is to stay up to date with the annual labs and preventative health screenings below. What I’m doing for my own body Last year I shared my personal lab results . Two big takeaways for me were that I needed to increase my protein intake and increase free testosterone levels by supplementing with zinc. As a woman in my 40s, I’m currently paying special attention to: Sex hormones: I don’t have symptoms of perimenopause yet but at 43, I know it’s coming. Getting a baseline now will be incredibly empowering when it’s time to optimize my treatment. Body composition: The time to build lean muscle and bone density is now so I’m paying very close attention to my DEXA results. I want to know what my bone health and body composition look like while I still have the ability to meaningfully build—by the time I’m 53, it will be much harder. Metabolic health: Because I eat Parsley-approved, I’ve always had great blood sugar control and heart health. But regardless of how well we eat, blood sugar control starts to weaken in our 40s, so I’m paying close attention to changes in my hemoglobin A1c this year. What I recommend for you At minimum, you should be testing the following every year. (Ideally, every six months.) Take this list to your doctor at your next well visit. And schedule one if you haven’t seen your provider in the past 12 months! Complete blood count (CBC) A measure of overall health that screens for anemia, infections, and certain chronic conditions. Comprehensive metabolic panel (CMP) Tests liver and kidney function, electrolyte balance, and measures blood glucose and protein levels. Electrolyte panel Includes all the electrolytes tested in a CMP plus magnesium, key for brain and cardiovascular function. Comprehensive cardiovascular panel Assesses heart health by measuring levels of lipoprotein(a), ApoA, ApoB, high-sensitivity CRP (hs-CRP), and oxidized LDL. Lipid panel Part of a comprehensive cardiovascular panel, a lipid panel measures cholesterol levels including triglycerides, LDL, HDL, and total cholesterol. Inflammatory markers C-reactive protein measures inflammation in the body, which can be a sign of infection or indicate an autoimmune disorder. Hemoglobin A1c A measure of your blood glucose levels over the past few months used to diagnose diabetes and pre-diabetes. Fasting insulin Assesses the body’s resistance to insulin, which is the earliest indicator of metabolic syndrome and diabetes. Thyroid panel Includes several markers such as TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies (TPO and TGAb) which are used to evaluate thyroid function and diagnose several autoimmune conditions. Core nutrients Measures key nutrients including zinc, vitamin D3, B vitamins (B12, folate), ferritin (iron), magnesium, and omega-3 fatty acids. Sex hormones Measures estrogen (total and metabolites), progesterone, testosterone (free and total) and DHEA-S. Liver and kidney function Biomarkers including GGT, homocysteine and AST, ALT, and ALP evaluate liver function while GFR indicates how well kidneys filter waste. Heavy metals Tests for the presence of metals like mercury, lead, and arsenic in the blood, which can affect everything from neurodegeneration, to cancer risk, to fertility. Ideally, I’d love to see more people going beyond the basics with specialty tests to make sure they’re not just living well but living optimally . Those tests include: Urine hormones Help us understand how your body is processing hormones, and how they are interacting—not just the topline level of hormones you have. 5-point cortisol test A saliva test administered at five points throughout the day gives us a full diurnal cortisol curve and better insight into adrenal function. Total body DEXA scan Measures bone, muscle, and fat composition for a more comprehensive picture of bone and metabolic health. Total body skin examination (TBSE) The first line of defense against skin cancer and especially important given melanoma rates are up more than 40% over the past 30 years. Pap smear and HPV screening So important for preventing cervical cancer, yet nearly 30% of women aren’t up to date with screening. I’m getting mine done this week. Cologuard colorectal cancer screening Detects abnormal DNA or blood markers in the stool that may indicate cancer. Colonoscopies are now recommended for people over 45, but I did my first Cologuard screening at 40 given my family history. And if you want to go really above and beyond: Full body MRI Elective MRIs are becoming more accessible; I had one done last year and discovered a thyroid nodule that I can now track closely for cancer progression through my yearly labs. GRAIL Galleri multi-cancer early detection test Detects DNA fragments in the body that originate from cancer cells and uses an algorithm to predict what type of cancer is the most likely cause before symptoms appear. These ultra-proactive scans aren’t for everyone—I have plenty of patients for whom these early screenings would be potentially overwhelming and lead to unnecessary testing. I recommend these tests for people who are comfortable with a) being very proactive and b) the ambiguity of an uncertain treatment path. The TL;DR, talk to your doctor before undergoing either of these tests. What to do with all this health data A lot of these tests are now available direct-to-consumer via companies like Function (tracks 100+ biomarkers), Ezra and Preneuvo (full-body MRI), BodySpec (DEXA scan), Lingo (continuous glucose monitor) and Parsley. If you’re willing to pay out of pocket, you can get almost any information about your current and future disease risk, which is awesome. But, what do you do with it? The number one thing is to work with a functional medicine specialist who can take the results and create a personalized protocol. Take A1c for example. Hemoglobin A1c below 5.7 is considered normal—if your labs come back with an A1c at 5.5, a traditional medicine doctor probably wouldn’t flag it. But an A1c of 5.5 is not optimal . Putting this number in context might prompt you to use a continuous glucose monitor for a few weeks to better understand how your body responds to food and adjust your diet accordingly to lower your risk of becoming pre-diabetic down the road. (BTW, I advocate sharing data from fitness trackers—especially CGMs—with your doctor.) Set up a free consult call with my team at Parsley today and take $150 off your membership when you sign up with the code RBMDCREW. Let’s chat live! I’ll be going deep on all things longevity at Luminescence , a one-day summit in LA on Feb.1. Use code ROBIN20 for 20% off your ticket. *The Parsley Functional Lab Panel is currently available to all members except those in NY, NJ and RI, though those states are rolling out soon! Keep Reading 100 Essential Labs Every Woman Should Be Tracking My personal lab test results—and what I’m doing about it… Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Plant medicine can be a tool, but it’s not a cure.
URL: https://www.robinberzinmd.com/therapeutic-psychedelics-plant-medicine/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: Plant medicine should be used in therapeutic or guided ceremonial settings run by well-trained and experienced facilitators.
One of my intentions for 2025 is to use plant medicine work selectively with the help of expert guided facilitators to expand my clarity and consciousness, so that I can achieve my highest purpose and impact. Whenever I share this, I get a lot of questions and a few raised eyebrows, so let’s dive in. Robin’s Short Version Foundation Matters: Dr. Berzin pairs plant medicine with 15 years of meditation and ongoing therapy, never using it as a standalone fix. Serious Risks Exist: Psychedelics can trigger psychotic or manic episodes, making experienced facilitation a medical necessity, not a preference. Clinical Evidence Building: Johns Hopkins, NYU, and MGH are researching psychedelics for treatment-resistant depression, PTSD, and chronic pain. The term “plant medicine” could describe any number of therapeutic drugs and traditional remedies derived from plants but it most often refers to psychoactive drugs. These include psilocybin, ayahuasca and MDMA, the latter of which is synthesized in a lab but has plant-based roots. I’m also going to talk about ketamine, which is a purely synthetic psychedelic. These drugs have been used in healing and spiritual practices for centuries and have recently seen a resurgence of interest in conventional medicine. Major research institutions and medical schools including NYU Langone Health , Massachusetts General Hospital , Johns Hopkins , Imperial College London and UCSF are all currently studying therapeutic psychedelics. Results from this newly invigorated round of research are early but promising , with psychedelics currently being studied as effective therapies for: Mood disorders (especially treatment resistant depression ) PTSD Headaches Chronic pain In recent years, psychedelic plant medicines have become part of my personal practice—occasionally. I’ve also watched as more and more of my patients have incorporated psychedelics with the help of trained therapists to great benefit. I think about one patient who had long suffered from severe eating disorders. Years of therapy and medication had not freed her. Her long time therapist, trained in psychedelic assisted therapy, and working with her using a combination of psilocybin and MDMA. Through this work, my patient remembered long suppressed childhood trauma and while these memories were deeply painful, their acknowledgement catalyzed recovery for her that had been out of reach for decades. I also think about another patient whose postpartum mood disorder (PMD) was so severe she couldn’t get out of bed after her first baby. Through bi-weekly ketamine therapy at a clinic, she was able to nearly completely resolve her PMD. The treatment became a powerful tool for her after her second and third child when the PMD returned. Beyond my patients, my community is actively engaged in psychedelic use. I’m often amazed by the offerings and practices being discussed on Whatsapp from business groups to mom chats. This is not something that is going away. That said, psychedelics are just one tool we can use to facilitate emotional well-being. For me personally, I see plant medicine work mainly as a powerful addition to a well-established meditation practice (15 years strong in my case) and therapy. The handful of guided ceremonies I have done have brought clarity to current situations I’m facing, have helped me tap into my own north star, and better understand my past and my patterns. These sessions have been at moments emotionally challenging, and at others beautiful and serene. I have left each with a greater understanding of myself that has shifted my overall well-being for the positive. I do not recommend entering into the world of psychedelics recreationally or lightly. In my view, psychedelic medicine, if used at all, should be used in therapeutic or guided ceremonial settings run by well-trained and experienced facilitators. These are not recreational party drugs; there are risks to these medicines , including the potential to trigger a serious psychotic or manic episode. Even without serious adverse effects, they can create intense experiences that warrant the comfort and safety of expert support. Unfortunately with their current in-vogue status, I see too many people using them as a shortcut and, as a result, not seeing meaningful benefit. I believe they have the most impact when they are followed by integration therapy and deep reflection. I’m skeptical of the hundreds of “ketamine clinics” popping up on street corners across the U.S. as well as of online purveyors of the drug, which lend themselves to a more transactional experience. More on what I do recommend below, but first let’s dive into the research. The research says While many studies indicate promising results, there are still a vast number of questions about the safety and efficacy of psychedelic-assisted therapies that can only be answered by large-scale, randomized, double-blind, placebo-controlled clinical trials. Which we just don’t have yet. The research below has informed my own practice and opinion on psychedelics, but I’ll stress again that it is so important to undertake psychedelic medicine work in a therapeutic setting with a well-trained facilitator for a safe and effective experience. Ketamine Ketamine is a dissociative anesthetic with hallucinogenic effects. The most promising research on ketamine is as a treatment for otherwise treatment resistant depression. In a study published in the Journal of Affective Disorders in 2024, for example, 74 participants across four treatment sites ages 18-65 received IV ketamine infusions over an 11-day period. After three treatments, over half of the participants achieved total remission. That’s huge. More placebo-controlled research is needed to understand the mechanism by which ketamine might work, however. A study published in Nature Mental Health in 2023, for example, found that participants with moderate to severe depression who received a placebo were just as likely to experience a large improvement in depression symptoms. In the 40-person study, researchers gave participants either ketamine or a placebo during previously scheduled routine surgeries where participants were under general anesthesia and therefore unable to feel the drug’s hallucinatory effects (or the placebo’s lack thereof). The researchers were “ amazed ” that both groups reported significant reductions in depression symptoms—that result prompts more questions than it answers. Importantly, ketamine should not be used as a recreational drug, nor should it be used without the direction and supervision of a well-trained practitioner. Even in lower doses, when used chronically, studies show that ketamine can impair short- and long-term cognition. Psilocybin Mushrooms containing the psychoactive compound psilocybin have been used for thousands of years in spiritual ceremonies and medicinal practices by cultures around the globe. Psilocybin (like LSD) is 5-HT2A agonist, a chemical which activates serotonin receptors in the brain. This is what enables the drug’s hallucinatory effects and creates altered sensory perception; it’s also the key attribute that makes these drugs potential treatments for anxiety, depression and addiction. A randomized, placebo-controlled trial of 104 adults published in the Journal of the American Medical Association in 2023, found that a 25mg dose of psilocybin—adminsitered with psychological support—produced a rapid and sustained improvement in depression scores with no adverse effects. A survey conducted by researchers at Johns Hopkins and published in Frontiers in Psychiatry in 2023, found that even outside of controlled laboratory settings, the majority of people who used psilocybin “in the wild” reported decreased anxiety, depression, alcohol misuse, neuroticism and burnout and increased emotional regulation. A minority (11% at 2-4 weeks post use), however, reported negative effects including depressive symptoms, underscoring the importance of psychological support in a controlled setting. MDMA MDMA is synthesized in a lab, but the psychoactive precursor safrole oil as roots in indigenous culture. Also known as “Molly” or “ecstasy,” MDMA is one of the more dangerous psychedelics to use recreationally—as an unregulated substance, there’s no way to be sure you’re getting a safe compound. In therapeutic settings, however, MDMA shows real promise in treating PTSD. A randomized, placebo-controlled phase 3 trial involving 104 adults with moderate to severe PTSD found significant reductions in PTSD symptom scores (around 50%) according to the results published in Nature Medicine in 2023. However, that same trial also reported adverse reactions in 9% of participants in the treatment condition, again underscoring the need to carefully evaluate the use of the drug with trained medical providers. The FDA was widely expected to approve an MDMA plus talk therapy treatment for those suffering from PTSD in 2024, but the application was surprisingly rejected after activist groups raised objections. You can read more about that here . Less well-known and well-studied psychedelics Other plant-based psychedelics like ayahuasca, peyote and salvia are less well-studied but may still have potential as therapeutic treatments. Anecdotal reports of ayahuasca “curing” conditions including depression, eating disorders, and substance use has led to a rise in “ayahuasca tourism” for those seeking shaman-guided ceremonies. But peer-reviewed research is scant. One review of available studies published in the open-access journal Cureus in 2024 analyzed 43 published studies—most of which used self-reported or survey data—on the effects of the drug and concluded there is potential as a mental health treatment. Though much more research on safety and efficacy is needed. What I’m doing for my own body As I shared, one of my 2025 intentions is to engage in plant medicine work, likely psilocybin-based, with a trusted guide at least once this year. The purpose of this intention is to help me expand self-awareness, better understand the origins of some of the habits and patterns that are holding me back, and to ultimately be a better mother, partner, doctor, and leader. There is no pressure to do this work, and for the most part, my inner work is rooted in my meditation practice, my health practices, and at times therapy. But at 43, my goal is to optimize both my potential and my wellbeing so I can be more for others. As I have experienced in the past, a plant medicine ceremony has helped me do that. What I recommend for you I’ll say it again: plant medicine is a tool, not a cure. The #1 thing I recommend if you’re curious about the benefits of plant medicine is to deepen (or start) your meditation practice. I recommend 15 minutes a day of simple box-breathing exercises , using an app like Calm or Insight Timer for guided meditation, or taking a course with a meditation teacher. If you’re looking for psychological healing, this is the place to start. Second, consult your medical provider about whether or not these treatments might be right for you. Never engage in psychedelic use without evaluating the risks with your medical provider. Psychedelics should not be used if you are pregnant, have a diagnosis involving psychosis like schizophrenia or a history of bipolar, have certain heart or neurological conditions, or are taking certain medications including in some cases, SSRIs. More on safety concerns here . Third, do your research to find a qualified facilitator and don’t rely on just one recommendation. I recommend speaking to multiple people a facilitator has worked with to get a sense of how they operate, and what to expect. From there, have conversation with them ahead of time to build a relationship and develop shared expectations of the experience. Here are some questions you might ask your potential facilitator: What has their personal experience with psychedelics looked like? Do they have an intake process that involves a thorough screening and consultation to make sure the treatment is right for you and discuss your goals? Do they paint psychedelics as a cure-all or set realistic expectations of how these therapies can be used as a tool? What do they hope you will get out of the experience and how does that align with your goals? What safety protocols do they follow? Do you feel comfortable with them? What do preparation and follow-up care look like to help you integrate your experience? (I know people will ask if I can recommend someone and the truth is, I can’t. Psychedelic treatment is off-label at best and criminalized at worst. For many practitioners, their privacy is their livelihood.) My plant medicine work has worked for me because I have a foundational meditation practice that produces equally powerful shifts over time. Popping into a ketamine clinic or doing a ceremonial plant medicine experience with no ongoing deeper therapeutic or spiritual work is not going to help you very much in my (strongly held) opinion. If you’re interested in plant medicine, carefully consider the above and how you might use it as a tool—not a cure. To learn more about how we approach mental health treatment at Parsley, set up a free consult call . Keep Reading How to reduce stress in 15-minutes The best “calm tech” to hack your vagus nerve The breathing habit that will transform your health overnight. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Bloating and brain fog? You’re probably low in butyrate. 
URL: https://www.robinberzinmd.com/butyrate/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: Increasing butyrate, a short-chain fatty acid, is key for the function of your metabolism, immune system and gut barrier.
The first functional medicine training I ever took was the gastrointestinal module from the Institute for Functional Medicine . It blew my mind. Robin’s Short Version Low Butyrate, Big Risk: Low butyrate signals bacterial imbalance linked to IBS, colon cancer, cardiovascular disease, and Alzheimer’s—not just bloating. Skip the Supplement: Fiber from fruits, nuts, whole grains, and legumes feeds good bacteria that naturally ferment butyrate in your large intestine. Brain Connection: Butyrate signals through the vagus nerve to reduce neuroinflammation and support neurotransmitter production and cognitive function. As a Columbia-trained doctor, I had been taught in medical school to think about gastrointestinal health as an isolated subspecialty. Conventional medicine looked at GI health in a vacuum. What I learned in that course was that gut health is part of an ecosystem inseparable from brain health, heart health, immune health, and metabolic health. Fundamentally, good health starts in the gut. So does disease; if you have an imbalance of bacteria or your gut lining is compromised, your immune system triggers, your brain can become inflamed, your metabolism slows down. In other words, gut health is ground zero. My training in functional medicine completely changed the way I approached patient care. Suddenly grasping the role of the microbiome and key metabolites became integral to getting to the root cause of my patients’ symptoms. (And not just the most common gastrointestinal complaints like SIBO .) At Parsley , we use a stool test called the GI Effects test to assess microbiome health. This full microbial analysis looks at dozens of biomarkers including markers of yeast overgrowth, inflammation, pancreatic function, and parasites. It also gives us a comprehensive view of your microbial metabolites—i.e. the things the bugs in your gut make when you feed them. Just like gut bacteria, the metabolites your bugs produce can be either helpful or harmful. Trimethylamine N-oxide (TMAO), for example, is linked to cardiovascular disease, kidney failure and colorectal cancer . Then there are the good metabolites, the ones I want to see a ton of on a microbiome test. N-butyrate is chief among them. Gut health is rarely about one supplement. In Off Script, I share the full protocols we use in practice. What is N-butyrate & where does it come from? N-butyrate is a really important type of fat known as a short chain fatty acid, key for maintaining gut barrier health. We can get butyrate through external sources (it’s found in certain foods like butter, cheese, and milk in addition to supplements) but the best way to increase your levels of butyrate is to get the bugs in your gut to create it. Butyrate is produced when “good” gut bacteria ferment dietary fiber—i.e. fruits, nuts, whole grains, and legumes—in your large intestine. When I see low butyrate on a GI effects test, what that tells me is that the balance of good and bad bacteria in the gut is off. That means this patient is not only at risk for symptoms like bloating and brain fog, but may have increased risk of developing IBS, colon cancer, cardiovascular disease, and Alzheimer’s. Key benefits of butyrate Most of my patients could benefit from increasing the levels of N-butyrate in their gut. Butyrate has outsized benefits for gut health, which in turn impacts brain health, immune health, and metabolic health: Gut health: Butyrate’s most direct impact is on the gut itself where it helps repair gut barrier function and heal leaky gut. It also decreases inflammation and promotes a healthy balance of bugs. This combination of factors may help explain why butyrate demonstrates protective effects against gut diseases like IBD and colon cancer. Brain health: If you’re not well-versed in the mind-gut connection, study up . Butyrate impacts the brain via the vagus nerve . It acts as a signaling molecule that impacts neuroinflammation, neurotransmitter production, and cognitive function and may even be a potential treatment for neurodegenerative diseases. Immune health: Butyrate is a powerful modulator of immune health. Specifically, it promotes the production of anti-inflammatory cytokines and inhibits the production of proinflammatory cytokines in the gut and beyond. Research suggests that this effect may help reduce symptoms associated with conditions and autoimmune diseases related to chronic inflammation from rheumatoid arthritis to allergies. One 2021 study found that one-year-olds with a higher concentration of butyrate in their gut microbiome were less sensitive to food and environmental allergens and less likely to develop asthma. Metabolic health: Butyrate may also play a key role in weight and metabolism via a few different mechanisms. What I find most interesting is recent research that shows the metabolite regulates energy metabolism and promotes fat oxidation, while also influencing appetite. Butyrate stimulates the production of GLP-1, a hormone that influences blood sugar regulation and appetite. Sleep: Butyrate may also help promote sleep via the gut-brain connection. One study published in Nature Scientific Reports in 2019 found that mice who were given a butyrate-promoting drug experienced a 50% increase in non-rapid eye movement sleep. What I’m doing for my own body The TL;DR: we want to increase our body’s ability to produce butyrate. To do this, I employ a two-part strategy: Increase my dietary fiber The current RDA for fiber is 38g for men and 25g for women. But almost no one is getting that. Estimates suggest less than 10% of people meet the dietary fiber guidelines. My personal fiber guideline: 30g is a good day, 50g is a great day. In addition to eating fiber-rich foods like cruciferous veggies, nuts and seeds, lentils and whole grains, most people could benefit from adding a fiber supplement to their diet. I’m a fan of Sakara’s Fiber Super Powder . Use my code ROBINBERZINSAKARA for 20% off. Take a probiotic clinically validated to produce butyrate Long-time readers know how much I love Seed. I use their VS-01™ Vaginal Synbiotic to support my vaginal microbiome and always recommend their daily probiotic DS-01® to support gut health. Given Seed is such a favorite brand, I was super excited to see the results of their latest research on butyrate. In a recent study among healthy participants, DS-01® increased the production of butyrate, making it the first multi-strain synbiotic (probiotic and prebiotic) clinically validated to produce butyrate in healthy individuals. Use my personal code DRROBIN25 for 25% off your order! What I recommend for you Seed your gut with prebiotics. Fiber feeds good gut bacteria, especially the strains that produce butyrate. Aim for at least 30g from resistant starches like legumes, whole grains, fruits like apples and berries, and cruciferous veggies. Take a probiotic with both prebiotic and probiotic strains. Back up the prebiotics you’re feeding your gut in the form of fiber with a probiotic like DS-01® that also contains prebiotics. Test your gut health. If you’re dealing with things like acne, psoriasis, eczema, autoimmune conditions, brain fog, or anxiety, a gut health test that assesses your gut biomarkers including butyrate can be the key to unlocking the right treatment protocol. Come test with us at Parsley and use my code RBMDCREW for $150 off your membership. Keep Reading Is “fibermaxxing” the key to slowing aging? Can You Really Eat Your Way to A Better Mood? Should you get a SIBO test? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is NAD+ the key to energy and longevity?
URL: https://www.robinberzinmd.com/nad/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Nicotinamide Adenine Dinucleotide (NAD+) plays a key role in cellular energy production and DNA repair. It’s an anti-aging powerhouse.
People are talking about NAD+ like it’s the holy grail of longevity. Or at least a no-brainer lever we can pull to increase energy and vitality. Robin’s Short Version NAD+ Drops With Age: Declining NAD+ levels impair DNA repair and cell recycling, contributing to Alzheimer’s, type 2 diabetes, and coronary artery disease. Food Comes First: Tryptophan-rich proteins and B3 sources like quinoa, legumes, and leafy greens help your body produce NAD+ before supplements are needed. Injection Gaps Remain: Injected NAD+ bypasses digestion for direct cellular uptake, but how much is absorbed and by which cells is still poorly understood. Lately I’m getting lots of DMs and texts from friends as well as questions from patients on which longevity treatments are legit and which to skip—especially in light of so many high-priced longevity clinics popping up and celebrities touting the treatments they are getting. (See my posts on peptides and calm tech for my take on other types of therapies). Personally, I’m all for anything that falls into the can’t hurt, might help—and has some evidence to support it—bucket. NAD+ falls into that category. Nicotinamide Adenine Dinucleotide (NAD+) is a coenzyme that plays a key role in cellular energy production, DNA repair, and the immune systems’ ability to regulate inflammation . It’s an anti-aging powerhouse. Here’s the good news: The body naturally synthesizes NAD+ from nutrients in your diet. Foods high in tryptophan—the amino acid found in protein-rich foods including meat, eggs, dairy, nuts, and seeds—and forms of vitamin B3 (namely niacinamide, nicotinic acid, and nicotinamide riboside) found in whole grains like quinoa and brown rice, legumes, nuts, seeds, and green leafy veggies, all help your body produce more NAD+. Here’s the bad news: levels of this super important molecule decline with age. Recent research suggests the drop in NAD+ might explain why we have an increase in DNA damage and cells become less able to recycle and repair themselves as we get older. The drop in NAD+ contributes to neurodegenerative diseases like Alzheimer’s, metabolic diseases like type 2 diabetes, and cardiovascular diseases like coronary artery disease. Enter supplementation. There are now dozens of treatments and supplements on the market which promise to boost NAD+ levels for increased clarity, energy, and longevity. The key to evaluating them is the “can’t hurt” part of my can’t hurt, might help philosophy. With any new supplement or longevity treatment, it’s important to make sure that: The risk is worth the potential reward. You have clear expectations. The only “miracle drugs” I know of so far are exercise and nutrition. So, should you try an NAD+ treatment? Here’s my take. The research says The excitement around NAD+ as a way to increase energy and vitality is warranted. But whether or not we can meaningfully boost NAD+ levels through supplementation or lifestyle choices is a different question. There is emerging evidence that taking exogenous NAD+ or its precursors might have an impact. But it’s important to say that evidence is not conclusive yet. Here’s what you might do and the benefits you might receive: NAD+ Infusions NAD+ infusions and injections are trending in wellness circles and among celebrities . Several clinics now offer intramuscular NAD+ shots or infusions similar to vitamin drips. These types of therapies fall squarely into that can’t hurt, might help bucket. In theory, the directly injected NAD+ bypasses the digestive system and is immediately available for cellular uptake. Once in the cells, the extra NAD+ will theoretically boost energy production in the mitochondria, activate enzymes including sirtuins and PARPs which support cellular repair, and enhance neurotransmitter activity while reducing oxidative stress to support brain function. It’s not yet well understood how much NAD+ can get absorbed and what cells are most likely to absorb it. Some small studies done in mice suggest that NAD+ injections could potentially increase NAD+ in the brain and heart but a lot more research is needed in humans. My POV: Trying an infusion won’t hurt. If you notice more energy and less brain fog, it might be working for you. Just don’t expect a miracle if you aren’t already making lifestyle choices that support more energy and longevity. NAD+ Precursor Supplements The other way to boost your NAD+ levels is by getting your body to make more of it. You can do this by supplementing with an NAD+ precursor like niacinamide, nicotinic acid, or nicotinamide riboside. The research here is also still emerging—but there is more promising evidence. Animal studies and a few clinical trials in humans suggest NAD+ precursor supplements may have a significant impact in treating several serious conditions. A few of the most promising human studies: A small 2021 study of 25 obese or overweight women with prediabetes took 250 mg of nicotinamide mononucleotide (niacinamide) for 10 weeks. Researchers measured improved insulin sensitivity but didn’t actually detect a rise in NAD+ levels. In a 2022 review , researchers analyzed various studies in which participants from various demographics took 1000 mg of nicotinamide riboside for anywhere from 9 days to 6 weeks. Across them all, they reported increases in NAD+. Even more promising, a 2022 study found NR supplements increased cerebral NAD+ levels in patients with Parkinson’s Disease and an associated improvement in symptoms. My recommendation: NAD+ precursor supplements show promise in boosting NAD+ levels particularly in the brain and muscles. But given the lack of data on safety and most effective dose and duration, talk to your doctor first. (I don’t recommend NAD+ supplements for pregnant or breastfeeding women, for example—not because there’s evidence of danger, there’s just not enough studies to say it’s definitely okay.) What I’m doing for my own body I’m focused on revving up my body’s natural NAD+ production via a two-part approach: eating foods high in NAD+ precursors and creating periodic conditions of energy stress which prompts the body to produce more NAD+. Eating NAD+ precursors Given my protein goals , I’m already getting a lot of foods high in tryptophan. To further boost my levels of NAD+, I’m focusing on adding more foods with vitamin B3 derivative nicotinamide mononucleotide like broccoli, avocado, cabbage, and edamame. Creating energy stress When cells are stressed—which is what happens when you exercise or fast—the mitochondria produce more NAD+ to give you the energy you need to power through. I’m currently doing 16-hour intermittent fasting, which has been shown to increase metabolism and lower inflammation. I eat dinner around 6 and then don’t eat again until 10 the next morning, which I’ve found really works for my body. You might have to experiment to figure out fasting windows that are right for you. I might also consider adding cold therapy to my sauna routine since there is some evidence that cold exposure might increase NAD+. What I recommend for you Signs of low NAD+ levels include: Fatigue & low energy Brain fog & cognitive decline Muscle weakness Poor recovery from exercise Accelerated aging There are several conditions that can cause these symptoms so I recommend starting with baseline testing at Parsley for a personalized gameplan. Besides NAD+, three actionable biomarkers we test for that we know are associated with longevity and anti-aging are: Inflammatory markers (CrP) Insulin sensitivity (A1C) Omega-3 index Become a member at Parsley Health to get a personalized plan for supplementation and lab testing. Use my code RBMDCREW for $150 off your membership. Keep Reading If You Only Fix One Thing for Longevity, Make It Your Mitochondria. My personal supplement stack. Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My cervical cancer scare
URL: https://www.robinberzinmd.com/my-cervical-cancer-scare/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: Does the cure for UTIs, HPV, and BV lie in the microbiome? In my 20s, a routine pap test diagnosed abnormal cells. That led to a biopsy of my cervix called
Does the cure for UTIs, HPV, and BV lie in the microbiome? In my 20s, a routine pap test diagnosed abnormal cells. That led to a biopsy of my cervix called a colposcopy, which revealed I had CIN3 , or “severely abnormal” precancerous cells. I was lucky to catch it while I was still asymptomatic and before the abnormal cells morphed into advanced cervical cancer. Robin’s Short Version Vaccines Have Limits: Gardasil 9 is nearly 100% effective, yet cancer-causing HPV strains can still break through. Gut-Immune Link: 70–80% of immune cells live in the gut, making microbiome health a key defense against HPV and cervical disease. Vaginal Flora Matters: Lactobacillus-dominant vaginal bacteria create an acidic environment that actively blocks pathogen growth and infection. Cervical cancer is primarily caused by the human papillomavirus (HPV). There are approximately 13 potentially cancer-causing strains of HPV, though 70% of cervical cancers are caused by just two : HPV 16 and HPV 18. HPV, which is contracted through sexual activity, it doesn’t just cause cervical cancer. At least one strain of HPV can cause cancers of the penis, anus, vulva, vagina, and even head and neck cancers. The HPV vaccine was a huge step forward in preventing these cancers—the most recent version, Gardasil 9, is nearly 100% effective at preventing cervical, vulvar, and vaginal infections and pre-cancers. But no vaccine is 100% effective—I personally contracted a cancer-causing strain of HPV despite getting the vaccine when it first became available. No matter who you are, any type of cancer scare is a wakeup call. In the months between my abnormal pap test, the confirmatory biopsy, and the eventual LEEP procedure I had to remove the suspicious cells, I made changes. I was in my third year of medical school at Columbia at the time and I wanted to learn everything I could about how I could give myself the best possible outcome. I started a daily meditation practice, taking time each day to lower my stress level and visualize the pre-cancerous cells disappearing. I made changes in my diet and started taking new-to-me supplements including folate, methylated B vitamins, vitamin D3, and a probiotic to support the health of my gut microbiome, since 70-80% of the body’s immune cells lie in the gut. After the LEEP cut out the affected area of the cervix, my doctor called me with the pathology results. It was the strangest thing, she said—she was sure of the biopsy result, but there were no longer any precancerous cells. Obviously, this is just my N of 1 experience, not a clinical trial with any kind of rigor. But I have to believe that the changes I made had some impact on shrinking the lesion to an undetectable size which shocked both me and my doctor. I believe we have the power to support our body in healing itself. High-stress, poor metabolic health, and gut dysbiosis are all biological processes that reduce the effectiveness of our body’s most important defense against everything from colds to cancer. I see huge numbers of patients at Parsley with recurrent UTIs, yeast infections, and HPV, all of which are effectively failures of the immune system. When it comes to vaginal and cervical health, women are taught basically nothing about prevention. In addition to vaccines and routine screenings, new research on the vaginal microbiome has me focused on new ways to optimize outcomes. The research says For many people, their immune system is able to fight off common genital urinary infections keeping the bacteria in check on its own. For others, that’s not the case. Could the microbiome be the key? In addition to the gut microbiome, the vaginal microbiome plays an important role in the development of infections. A healthy vaginal microbiome, dominated by Lactobacillus species, helps maintain an acidic environment that inhibits pathogen growth. The microbiome and UTIs Disruptions in the balance of the vaginal microbiome can increase UTI risk . But there’s also evidence that a UTI can start in your gut. Research on the connection between the gut microbiome and vaginal health is still limited, but we know that the gut microbiome can act as a “ reservoir for UTI-causing pathogens .” The mechanism explaining how dysbiosis (i.e. an imbalance in harmful vs. helpful bacteria) increases your chances of getting a UTI isn’t totally clear; some studies suggest low gut microbiome diversity may lead to a drop in short-chain fatty acid production. This can lead to an overabundance of bugs like E. coli , which cause UTIs. A lot more research is needed to understand this connection and if our primary method of treating UTIs—antibiotics—is actually making things worse. Antibiotic treatments decimate the gut microbiome, and early research suggests this might contribute to recurrent UTI infections. (A quarter of women get another infection within six months of being treated by antibiotics for the original UTI.) A small study published in Nature Microbiology found that women with repeat UTIs had decreased diversity of healthy bugs in their gut microbiome. Specifically, they were low in butyrate, a short-chain fatty acid with powerful anti-inflammatory effects, which I wrote about in a recent newsletter . The microbiome and BV Bacterial Vaginosis (BV) is the most common vaginal infection in women of reproductive age, characterized by an imbalance in the vaginal microbiome. Not only is it annoying, it can increase the risk of STIs and pelvic inflammatory disease. Remember, a healthy vaginal microbiome is rich in Lactobacillus species, which produce lactic acid to help kill pathogens. BV results when these healthy bugs are choked out and anaerobic bacteria like Gardnerella vaginalis take over. Researchers are currently exploring the increasingly promising strategy of treating infections like BV with probiotics instead of antibiotics; specifically introducing Lactobacillus crispatus straight to the source. The microbiome and HPV So if an acidic vaginal microbiome dominated by pathogen-killing Lactobacillus species can help reduce infections like UTIs and BV, can it also help prevent more serious infections like HPV (and ultimately cervical cancer)? Yes. Research shows that HPV infection is associated with decreased levels of Lactobacillus and increased microbial diversity (i.e. more bad bugs). HPV infection further harms vaginal microbiome diversity potentially leading to persistent infection, according to a study published in Nature Communications in 2022. This may directly contribute to the risk of developing cervical cancer since “oxidative stress resulting from microbial dysbiosis” encourages the progression of HPV-positive cervical lesions. What I’m doing for my own body Vaginal health has remained top of mind for me since my brush with HPV. Now I know that supporting my microbiome is even more important. Here’s what I’m doing: Screening Screening is one of the most important tools we have for preventing cancer. I worked with Johns Hopkins’ JHPIEGO , a non-profit funded by USAID, in Nepal treating women with HPV and cervical cancer and saw first-hand the importance of getting screened to improve disease outcomes. Since my scare, my Pap tests have been normal. So I follow current ACOG guidelines for cervical cancer screening , and get a Pap and HPV test every five years. I got my most recent Pap results as I was drafting this newsletter and am pleased do say everything is clear. Optimizing my diet Sugar feeds yeast, which can increase the risk of GU infections and trigger inflammation. I aim for less than 25g of sugar per day to support various health goals, including my vaginal microbiome health. Probiotics and prebiotics are also key for me. The bacterial strain Lactobacillus , which is found in many probiotic supplements and foods like fermented dairy, veggies, and soy, can help maintain a balanced vaginal microbiome. I back that up with fiber, prebiotics that feed the beneficial bacteria. My current fiber goal is 40-50g per day. What I recommend for you In addition to the tips I follow above, at Parsley, I use a combination of probiotics and antimicrobials (prescription or herbal) to help treat GU conditions in the moment and resolve them for good. Supplement if needed. For patients struggling with uro-gynecological issues, I sometimes recommend Fem-dophilus . Reconsider tampons. The recent study showing concerning levels of heavy metals found in tampons made me rethink my period products. I use the brand Nataracare, which use organic GOTS-certified cotton that is third party tested and confirmed not to contain detectable levels of heavy metals. Choose the right lubricant. What you put down there—particularly its pH level—has a big impact on the vaginal microbiome. The World Health Organization recommends using a lubricant with a pH of 4.5. I recommend a water-based lubricant which won’t damage the vaginal microbiome over time, according to a small study of postmenopausal women. Parsley’s free Symptom Index quiz will give you a snapshot of your overall health and flag areas of concern. Use my code RBMDCREW for $150 off your membership. Keep Reading Your comprehensive preventative health checklist. 100 Essential Labs Every Woman Should Be Tracking How to prevent cancer at younger ages Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is “fibermaxxing” the key to slowing aging? 
URL: https://www.robinberzinmd.com/is-fibermaxxing-the-key-to-slowing-aging/
Updated: 2026-02-28 · Topics: Toxins, Nutrition & Modern Exposures
Summary: I don’t normally advise taking medical advice from TikTok but sometimes the algorithm gets it right and boosts a tip with actual evidence behind it—like “f
I don’t normally advise taking medical advice from TikTok but sometimes the algorithm gets it right and boosts a tip with actual evidence behind it—like “fibermaxxing.” Robin’s Short Version The 5:1 Rule: For every 5g of carbs, aim for 1g of fiber — a 2:1 or 3:1 ratio delivers even stronger healthy-aging benefits. Fruit’s Aging Edge: Replacing refined carbs with fiber-rich fruit raised healthy aging odds by 14%; top picks include raspberries, avocado, and guava. Your Daily Target: Aim for 30g of fiber as a baseline and 50g as optimal — most Americans get 84% of carbs from refined, low-fiber sources. Don’t let the name turn you off. Fiber is a macronutrient with extensive research behind it, something that makes it unique in the grand scheme of nutritional science. We know that fiber is essential for: ✅ Gut health (fiber is fermented by gut bacteria into short chain fatty acids including butyrate , which lower inflammation) ✅ Blood sugar regulation (fiber reduces postprandial glucose spikes, reducing your risk of metabolic syndrome) ✅ Reducing cholesterol (fiber binds to cholesterol in the gut, reducing absorption and improving lipid profile) ✅ Removing forever chemicals (fiber binds to chemicals including PFAS , reducing absorption and helping you flush them out) My personal fiber guideline: 30g is a good day, 50g is a great day. One of the ways I’m going to get there is by, can’t believe I’m saying it, fibermaxxing . Today, on average, 50% of our calorie intake is from carbs but the majority of that— 42% of total calories (or 84% of our total carb intake)—is not from fiber but from refined carbs, which have been shown to accelerate the aging process by damaging DNA (through increased oxidation) and by fueling disease processes like diabetes. I was excited to see a new study published this month in the Journal of the American Medical Association adding more clarity to how you can incorporate fiber to optimize your health and help you age well. Using data from a cohort of over 47,000 women from the long-running Nurses Health Study, the researchers found: 🫛 Good Carbohydrates reduce chronic disease. Women with a higher dietary fiber intake aged better. Every 10% increase in daily calories that came from high-quality carbs in the form of whole grains, fruits, and veggies increased the likelihood of aging without chronic disease or significant mental or physical impairment by 31%. 🍞 A carb-to fiber ratio of 5:1 or less is ideal. To get the benefits of good carbs, aim for a low carbohydrate-to-fiber ratio of 5:1 or less, meaning for every 5 grams of carbohydrates there’s at least 1 gram of fiber. 3:1 or 2:1 is even better. Nutrition labels will give you total carbs and total fiber, so this is easy to measure on the fly. If there is no label but you’re eating a head of broccoli or a whole apple, you can be assured you’re in the right zone. 🥑 Replace refined carbs with fiber-rich fruits. In addition to adding fiber to your daily calorie intake, replacing refined carbs with fiber increased the odds of healthy aging by 7-16%. Fiber from fruit had the biggest impact (14% increase in odds of healthy aging). Five fruits with excellent carb-to-fiber ratios: avocado, raspberries, blackberries, strawberries, guava. 🧁 Use a CGM to find out which carbs spike blood sugar. We all know to avoid ultraprocessed foods but even whole grain fiber or fruit can produce a different glucose response in different people due to differences in genetics, microbiome composition, and even pace of eating. Learn how your body responds by using a CGM to track your blood glucose response to specific foods. I often prescribe the Freestyle Libre 3.0 to patients who then work with our health coaches to optimize meal planning based on the data. ( Lingo and Stelo are two CGM options available without a prescription.) But, can you eat too much fiber? Short answer: Yes. Taking “fibermaxxing” to the actual max can cause digestive issues like bloating, gas, and cramping in the short term and lead to nutrient malabsorption that can cause bigger issues. Aim for 10-15 grams of fiber per meal, and 5-10 grams per snack. Right now I’m adding a scoop of Sakara’s Fiber Super Powder to my smoothies to help meet my fiber goals. (I also like Metafiber from Metagenics.) Drink adequate amounts of water so you don’t get bloated. Aim for 12-20 oz of water with each meal, especially if you’re fibermaxxing. Commit to cooking one high fiber meal a day at home. If you’re looking for inspiration, my friend Mikaela Ruben’s veggie forward cookbook Eat to Love comes out today! I also follow Jesse Krux for simple plant-based meal ideas. What I’m Reading This Week #1 Can magnesium improve your blood sugar? As if you needed more reasons to love magnesium! It’s important for brain health, heart health, bone health, and for calming the nervous system. That’s why it’s one of the top supplements I recommend for women’s longevity . I was excited to see this recent meta-analysis further defining the benefits of magnesium for blood sugar control. Magnesium supports insulin production and insulin receptor function and also promotes glucose uptake into cells. This combination contributes to the author’s conclusion: a diet high in magnesium can lower the risk of metabolic syndrome by 21%. Why do we need to supplement? Don’t we get magnesium in food? We do get some, but dietary sources of magnesium probably aren’t enough; we’ve seen a meaningful decrease in magnesium in our food supply over the past several decades. About 80% of naturally occurring magnesium is lost during food processing. Even whole fruits and vegetables are becoming less magnesium-rich thanks to soil depletion and changes in farming practices. Given magnesium’s association with a reduced risk of chronic conditions like type 2 diabetes, heart disease, and stroke, I recommend taking a magnesium supplement of 300-400mg per day. The best forms are: Magnesium glycinate (like the one we make at Parsley , which I take nightly) for combating stress, aiding sleep, and boosting glutathione. Magnesium threonate for cognitive enhancement, slowing brain aging, and reducing anxiety. Mag threonate has been shown to penetrate the blood-brain barrier best. But pro tip: I find mag threonate gives me crazy dreams, so I prefer glycinate personally. #2 What the new COVID vaccine recommendations mean for us Last week RFK Jr. announced that the U.S. government would be ending COVID vaccine recommendations for two key groups: pregnant women and healthy kids. Then on Friday, the CDC contradicted Kennedy , saying kids can still get the vaccine after consulting with a doctor. In light of the extreme amount of noise happening around this topic, here’s my view on what you need to know when making decisions for yourself and your family: Given the current status of the virus, I’m comfortable moving to no longer recommend the COVID vaccine booster for truly low-risk groups . For my fellow parents making decisions for their kids’ health, I don’t think the booster is necessary. For pregnant women, it’s more complicated. Before we break out our pitchforks and torches on this topic, I want to acknowledge that I know we all have strong feelings about this. The pandemic experience and the resulting fear it caused (whether the fear of getting sick, or the fear of another lockdown) lives in all of us, regardless of our politics. So take a breath, and let’s take a moment to look at the science. COVID hospitalization rates are at an all-time low. So are COVID deaths ; there were less than 250 weekly COVID-related deaths this month (compared to close to 1,000 per week in May of 2023). Data from the 2024-2025 COVID season showed the booster further decreased the risk of hospitalization (vaccinated adults were 33% less likely to end up in the hospital or urgent care). The booster does not reliably prevent infection, it just reduces the severity of infection when it happens. The risk of healthy kids (meaning kids without underlying conditions like diabetes, asthma, or obesity) being hospitalized with COVID was always low : less than 3 in 100,000 at the peak, the majority of whom had underlying conditions. (When COVID happened I had a 3-year-old and a 6-week-old and as mounting evidence showed that largely young kids were not dying from it, I thanked the universe every day). On review of the 2024-2025 flu/COVID season, kids accounted for just 4% of hospitalizations and 59% of those had at least one underlying condition. (Kids under four are the most likely to be hospitalized with babies under 6 months having the highest risk.) The recommendation when it comes to pregnant women is more complex. The ACOG (American College of Obstetricians and Gynecologists), representing the doctors responsible for caring for our pregnant women and delivering our babies, are strongly opposed to RFK Jr.’s decision to no longer recommend the vaccine, which I think is important to register. At the start of the pandemic 31% of pregnant women with COVID were hospitalized vs. just 5.8% of non-pregnant women. The CDC no longer tracks how many pregnant women are hospitalized with the virus, but we know that the risk of negative outcomes (including death) is still higher. Systemic changes during pregnancy (increased pressure on the lungs, higher blood sugar, higher circulating body fluid volume) make it harder to fight off infections and systemic inflammation. (This is why even healthy pregnant women are at higher risk of severe illness if they get the flu, for example.) Another reason to consider a booster: babies under 6 months rely on maternal antibodies transferred from mom both in utero and then through breast milk to fight off disease before they develop their own immunity. And because hospitalization rates of kids with COVID is more frequent in babies 6 months or less, there is an additional rationale to continue recommending the COVID vaccine in pregnancy. What I do for myself, my family, and what I recommend: I do not currently get COVID boosters as I have no underlying risk factors and am not regularly in contact with high-risk patients. I see patients via telehealth, and don’t work in a hospital setting. I am comfortable not vaccinating my kids for COVID. They do not have underlying risk factors that would put them at higher risk of severe disease. They have also had COVID and not had severe symptoms. I respect that this decision is personal to you and your family; by sharing what I am comfortable with for my family based on the science I shared above, I am no way judging you for what is best for yours. If you are someone with an underlying risk factor (e.g. a chronic disease including obesity, lung disease, diabetes, or cancer) or are over the age of 65, the vaccine is still recommended. If you are pregnant, the risk of severe COVID remains higher than for non-pregnant women, but is still low overall. I recommend consulting with your doctor about your personal set of risk factors and whether it makes sense to get a booster. If the shifting recommendations result in gaps in insurance coverage, the vaccine runs around $200 out-of-pocket. How to Be Healthier Than Ever This Week 💪 Women age differently than men: My post on the top factors that accelerate aging in women has nearly 200K views. Check it out on Instagram and look out for a future deep dive in the newsletter 👀 💦 Hot tip: I’m in a love affair with my Heavenly Heat home sauna . It’s made of non-toxic materials so there’s no off-gassing and it has a red light panel to help boost skin health and muscle recovery after my weekly pilates session. Use code ROBIN for 10% (up to $1090!) off! 🧠 Vitamin D keeps getting better: A recent study found taking a vitamin D supplement reduces the risk of dementia by 40% over a decade. Add 2-5 drops of Parsley’s Vitamin D3 + K2 to your water bottle daily, or drop it straight into your mouth, which is how I take it! Keep Reading Bloating and brain fog? You’re probably low in butyrate. Can You Really Eat Your Way to A Better Mood? 10 nutrient-dense snacks I pack on-the-go Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How to slow your aging velocity
URL: https://www.robinberzinmd.com/how-to-slow-your-aging-velocity/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Last week I co-hosted an event for New York’s YPO Women on female longevity at the Parsley Health center in NYC along with two brilliant speakers: nutritio
Last week I co-hosted an event for New York’s YPO Women on female longevity at the Parsley Health center in NYC along with two brilliant speakers: nutrition expert JJ Virgin, and Melanie Goldey, CEO of Tally Health. Robin’s Short Version Hidden Muscle Loss: Women lose up to 23% of muscle mass during lactation, triggering roughly 1.5 lbs of weight gain per year in perimenopause. Estrogen’s Wide Reach: Declining estrogen raises Alzheimer’s risk 2x and osteoporosis risk 5x, while also accelerating heart disease and blood sugar dysregulation. Ditch the Scale: A DEXA scan measures lean mass, fat mass, and bone density—the metrics that actually predict longevity outcomes, not your weight. It was exactly the kind of event I live for: a room full of motivated, curious women ready to be healthier than ever. We dug deep into the science of what makes longevity different for women and why it matters. While women live longer than men, we spend an average of 12 years in poor health vs. just 10 for men. That’s 16% of our total lifespan. Longevity and health optimization are fields dominated by men. The loudest voices in the space are men (many of whom speak authoritatively about women’s health) and the majority of longevity research has historically been done on men (or very small groups of elite female athletes). But women have different physiological needs and we age in unique ways. Part of why is the fact that women go through two major health events—pregnancy and menopause—which have a lasting and defining impact on bone, brain, heart, and metabolic health that prime us for chronic disease in unique ways. During pregnancy, for example, many women experience depleted omega-3 levels. We literally build our babies’ brains from the fat stores in our bodies, which can contribute to mood disorders, brain fog, and inflammation. Postpartum, women lose up to 23% of muscle mass during lactation, setting them up for weight gain in midlife. Estrogen decline during menopause hits almost every aspect of our health: Brain cells become more vulnerable to the effects of amyloid-B proteins, which is why women are 2x more likely to get Alzheimer’s disease. Loss of estrogen leads to worse blood sugar control while weight gain for women often starts in the early 40s in perimenopause and increases by an average of 1.5 pounds each year . Together, these two factors help explain why 4 in 10 women over 40 have metabolic syndrome and nearly 20% have diabetes. Women lose 10-20% of their total bone mass after menopause, which is why osteoporosis is 5x more likely in women 50+ than men. Estrogen also offers protective effects on heart health by controlling cholesterol levels and reducing arterial fat buildup; the loss of estrogen accelerates heart disease . Add to all of this: ❌ Sedentary lifestyle: Accelerates muscle and bone loss, increases insulin resistance, and slows metabolism. ❌ Chronic stress/high cortisol: Promotes belly fat, muscle loss, and sleep disruption that accelerate telomere shortening. ❌ Poor sleep: Reduces cellular repair, raises inflammation, and impairs hormone balance. ❌ Environmental toxins and hormone disruptors: Exposure to BPA, phthalates, and parabens messes with hormone balance and contributes to earlier menopause. Women have higher exposure than men—we use 13 personal care products on average each day. ❌ Cultural norms about women’s bodies: The pressure to be small discourages women from weight training and building lean muscle mass. ❌ A medical system that wrongly discouraged HRT for decades It’s a perfect storm for women experiencing worse health and faster aging velocity than men. So, what do we do about it? JJ, Melanie and I covered a lot in our conversation. The full extent of our talk is available as a customized women’s longevity protocol for Parsley members but I wanted to share the top takeaways with you here! 💪 Forget weight—body composition is the metric that matters. We’ve made women obsessed with their weight as a measure of health. It’s time to deprogram. A full-body DEXA scan is the current gold standard for understanding your body composition (lean mass vs. fat mass, plus bone mineral density). Do one annually or at least check in with a body composition scale every month or two. Your weight might stay the same but if you’re trading fat for muscle, you’re improving. 18-24% body fat is ideal for metabolic health, longevity, and hormone balance. JJ turned me on to supplementing with Fortetropin; clinical data show 2.5 g/day for eight weeks leads to an average gain of ~2.5 lb of lean muscle mass and ~1 lb of fat loss without changing exercise habits. 💪 Get stronger, not smaller. Grip strength is an underrated longevity vital sign. The TL;DR: it’s a proxy for total body strength and predicts all-cause mortality better than blood pressure or BMI. You should have a grip strength between 27 and 32 kilograms in your 30s, 25-30 kg in your 40s, 24-28 kg in your 50s, 22-26 kg in your 60s, and 18-22 kg over 70. You’re also looking for relative symmetry. I discovered I have a 17% difference between my left and right sides (I’m right handed) which tells me I need to prioritize functional exercises (e.g., deadlifts, squats, farmer’s carries) that help me even out. You can get your grip strength tested by your doctor or by a personal trainer. Or you can buy an at-home hand dynamometer for about $30 on Amazon . Supplementing with Urolithin A (500-1,000 mg/day) can improve muscle strength and endurance in middle age. 💪 Eat 30g of protein in your first meal of the day. Distributing your protein intake evenly throughout the day helps overcome anabolic resistance (i.e. the age-related decline in your body’s ability to build muscle). Aim for 25–30 g of high-quality protein per meal. My go-to intermittent fast break right now is a Parsley Rebuild Clean Protein smoothie. (Pro tip: most vegan protein powders aren’t complete proteins and therefore aren’t as useful for building muscle. Parsley’s is enhanced with branch chain amino acids to make it complete.) I add almond butter, spinach, olive oil, frozen blueberries, and cinnamon to mine. I’m also adding 5 mg of essential amino acids (EAAs) after my morning workout. EAAs are essential for muscle growth and repair but can’t be made by your body. 💪 Balance is BS. Resilience is Everything. I’ve basically thrown the word balance out the window. Stress is inevitable; it’s how we recover that matters. Data in tens of thousands of users from Tally Health showed that positive stress management practices like meditation and yoga had the biggest impact on epigenetic markers of aging—even more than diet and exercise. Get better at recovery by: Tracking HRV with a wearable (like Whoop, Oura Ring, or Apple Watch). HRV is a marker of your body’s ability to respond to stress and relax again. Meditation and vagus nerve stimulation, which I wrote about recently , have also been shown to improve HRV. HIIT workouts. HIIT workouts train your body to move in and out of stress with ease. Regular people need to develop the same ability to kick into a high stress state of performance and then quickly recover as an elite athlete. Research shows 2-3 HIIT sessions per week can meaningfully improve HRV. Hot/cold therapy trains the body for resilience. Heat therapy (sauna) followed by cold plunge (just 2 minutes is enough to shiver which beiges fat, making it more metabolically active) then sauna again is a training ground for your nervous system. Just note: don’t train cold. 💪 Get proactive with lab tests. I see a lot of women subconsciously scared to get labs. This is heartbreaking for me. We have shamed women for their weight, defining their worth by a number on a scale for so long that many women shy away from numbers all together, including their own biomarker data. But if we want to be healthier in the next 10 years, women should be testing a full panel of functional biomarkers at least twice a year. Start with my comprehensive preventative testing checklist . At Parsley we developed a Female Functional Age Score™ to zero in on six factors that have the biggest impact on women’s health: thyroid, heart health, metabolic health, nutrient and toxin levels, and inflammation. What I’m reading this week #1 Exercise increases your odds of surviving cancer by 37% We already know that exercise is our #1 longevity drug. This is a constant refrain of experts like Peter Attia and JJ Virgin and backed by decades of high-quality research, but we haven’t heard much about how exercise impacts cancer. So I loved reading this newly published article in the New England Journal of Medicine about the latest science behind how exercise improves cancer survival. Colorectal cancer patients enrolled in an exercise program with a trainer had a 37% lower risk of death after eight years and a 28% lower risk of their cancer coming back or developing a new cancer. Overall, the program prevented one death for every 14 people who joined it. My personal motivation to get into medicine was losing my grandmother too early to colon cancer. But as much as I do for my health, I find exercise is the thing that falls by the wayside more than anything else. This study lit a fire for me to get moving and I hope it does for you too. #2 Are microplastics a new reason you can’t fall asleep? For me, nothing feels worse than a bad night’s sleep. As a genetically slow caffeine metabolizer (like 50% of us) I stop drinking coffee at 9 a.m. to avoid any lingering effects and won’t travel anywhere without my eye mask and mouth tape. But sometimes it feels like I’m doing everything right and still have a hard time sleeping so I felt both terrified and vindicated when I read an article this week about how the chemicals in plastic disrupt sleep in a way similar to caffeine. According to the peer-reviewed study , the plastic-associated chemicals we’re absorbing through our air, water, food, and skin, can shift your body’s internal clock by up to 17 minutes; they activate the body’s adenosine receptors, which regulate sleepiness and alertness (and also play a key role in inflammation). I recently wrote about how microplastics are everywhere , how to limit exposure and how to detox what we can. The reality is microplastics aren’t going anywhere any time soon, so I take this news as meaning we have to do even more to counteract their effect on sleep quality. What do you do? Other than avoiding caffeine too late in the day, limiting alcohol, sleeping in a cold dark room, and locking your phone in a box to prevent pre-bed doomscrolling, the best way to counter this plastic-driven clock disruption is to power on our natural melatonin production through: 😴 200-400 mg of magnesium glycinate to support melatonin and relaxation 😴 200mg of “phos serine” (phosphatidylserine) to reduce nighttime cortisol 😴 5 minutes of deep breathing to reduce evening cortisol (and support melatonin synthesis) How to be healthier than ever 🧬 Amino appreciation: I recently shared on Instagram why I add 5 mg of essential amino acids to my supplement stack and whether you need them to support your longevity goals. 💧 Drink up: I finally got sick of trying to find the best countertop water filter and installed a PUR faucet system . Long-term, I’m planning to install a reverse osmosis filtration system in our house for optimal water quality, but this was an easier, cheaper install and I’m resting easier knowing my family’s NYC drinking water is free of lead, microplastics, and mercury. 🏋️ Check your body composition: If you haven’t had a recent DEXA scan, stay up-to-date on your body composition with an advanced at-home scale. I like this one from Withings that offers segmental body composition and tracks visceral fat and Basal Metabolic Rate (BMR). Keep Reading Chronological vs. Biological Age: Which One Really Matters? If You Only Fix One Thing for Longevity, Make It Your Mitochondria. What a CGM Can Tell You About Your Aging Velocity Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The cold plunge controversy
URL: https://www.robinberzinmd.com/the-cold-plunge-controversy/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: It’s summer and it feels like everyone is installing a cold plunge in their backyard or basement spa
Plus, a new reason to try a keto diet and my favorite at-home HIIT workouts. Robin’s Short Version Mood Boost Timeline: Just 5 minutes of cold immersion reduces nervousness and distress, with stress-lowering effects lasting up to 12 hours. Shiver for More: Reaching shivering thermogenesis burns extra glucose through rapid muscle contractions, increasing caloric expenditure beyond cold exposure alone. Women, Take Note: Research showing cold plunge blunts muscle growth was conducted almost entirely in men and may not apply to women’s physiology. It’s summer and it feels like everyone is installing a cold plunge in their backyard or basement spa. As someone who is obsessed with my in-home sauna but despises being cold, I usually feel a mild sense of personal failure when I can’t bring myself to do the plunge. When we go to Bathhouse in NYC and everyone dutifully wades into the icy waters, I just keep walking. Rather than continue to feel badly about this, I thought it was time to dive into the science behind the hype. Are cold plunges going to go the way of the NordicTrak and wind up as very expensive coat racks in five years? Or is it time to jump in with everyone else? The fixation on cold therapy is based on emerging science (some of it really compelling, some not so much) and anecdotal reports. The TL;DR: we need more information to recommend effective cold therapy protocols—especially for women. But the research is promising. A high-quality meta-analysis of cold plunge studies published earlier this year in the journal PLOS One summed up the situation well: cold plunge research is “constrained by few RCTs, small sample sizes, and a lack of diversity in study populations.” Here’s where we see the most well-supported benefits: 💪 Muscle soreness: A meta-analysis of 20 years of cold plunge studies found that cold water immersion (CWI) after exercise decreases delayed-onset muscle soreness, perceived exertion, and lactate in the blood. 🧠 Enhanced mood and mental clarity: CWI can promote enhanced connectivity in brain regions associated with emotion regulation (as shown by fMRI) and boost serotonin, dopamine, and endorphins. A small study with 33 participants showed that after 5 minutes of cold plunge, participants felt more active and alert and less nervous and distressed. ⛑️ Hormesis and resilience: A low-dose stressor like a cold plunge can improve your body’s resilience in the face of stress, which is key for longevity. The PLOS One meta-analysis found a brief cold plunge can lower reported stress for up to 12 hours afterwards. There’s also some evidence that brief cold exposure stimulates the vagus nerve, which regulates our relaxation response. 🏃Increased metabolic rate: Cold exposure activates brown fat via non-shivering thermogenesis (which burns energy to generate heat) and can “beige” white fat —i.e. make stored fat more metabolically active. If you let yourself get to the point of shivering thermogenesis, the benefits increase; the rapid involuntary muscle contractions burn glucose and increase your caloric expenditure. 😴 Better sleep: A cold plunge may help increase parasympathetic tone via the vagus nerve, leading to increased slow-wave sleep, which is key for physical and mental recovery. What about cold plunge for women? The science gets murkier when it comes to whether or not cold plunges are beneficial for women. Most of the research on cold therapy has been done in men, but women have different physiologies. For example: women experience greater vasodilation after exercise. So a cold plunge, which helps send all that cooled blood back centrally, may have greater recovery benefits for women than for men. But there are also some potential red flags for women to consider. Here’s what we know: Cold plunge may arrest muscle protein synthesis. There’s a body of research showing post-workout cold plunge can blunt muscle growth. But the vast majority of that research was conducted using only men. So while a landmark study found that post-workout cold water immersion led to smaller gains in muscle mass and strength vs. active recovery and a more recent study found it may inhibit the mTOR pathway (critical for building muscle) in men, the evidence is insufficient for women. Given how important building lean muscle mass is to women’s longevity, understanding these effects for women is key. It may cause hormonal fluctuations . Anecdotally, some women report changes in menstrual timing or cramps. No clinical studies have assessed the impact of cold plunge on fertility but theoretically , excessive stress could impact the hypothalamic–pituitary–ovarian (HPO) axis, potentially throwing off the menstrual cycle. On the flip side, if cold plunge improves metabolic health, that could improve fertility, especially in someone with PCOS. Women don’t need to be as cold as men. Women don’t require (or tolerate) the same level of cold as men to experience vasoconstriction and metabolic and recovery benefits. When women go too cold (below ~15 degrees celsius) our bodies skip shivering and kick into a sympathetic stress response where the body increases cortisol instead of activating thermogenesis. To be clear, there’s no science that says doing a cold plunge once or twice a week is going to hurt you . (Exceptions are: pregnant women, people with cardiovascular conditions, or poor circulation or neuropathy. If that’s you, stay warm.) Based on what we do know—and what we don’t—I’m intrigued by the cold plunge. Specifically, I’m up for trying 1-2 minutes in a 55 degree plunge as a way to make my fat more metabolically active, increase dopamine and endorphins, improve sleep, and to support my regimen for improving resilience and recovery . I still love my sauna—if hot and cold contrast therapy can help me recover from stress faster, great. Here’s what I plan to do: Stick to 2-3 minutes. Stay in just long enough to induce shivering and then get out. Never workout cold. Working out cold can increase your risk of injury and reduce the effectiveness of your workout; cold decreases blood flow to muscles, which are less flexible and produce less power. Do a sauna, cold plunge, and then get back to normal temp before working out. Don’t use a cold plunge immediately after strength training. Save it for endurance exercise recovery or rest days. Keep it mild. Slightly milder temps (55-56 degrees) are enough to trigger metabolic pathways. Anything colder can trigger too great of a stress response for women. What I’m Reading This Week #1 Time to go keto? For a while there, the keto diet was everywhere , but recently it feels like it’s fallen out of focus, no? Given the recent quiet on the keto front, I was interested to read this new study , which found material brain health benefits from a 3-week ketogenic diet. Eleven participants with no neurological conditions or other chronic health issues followed two diets for three weeks each: Keto (5% carbohydrates, 20% protein, and 75% fat) Standard (45–60% carbs, 10–20% protein, and 25–40% fat) After 3 weeks on a ketogenic diet, brain scans and blood tests revealed an impressive 47% rise in levels of brain-derived neurotrophic factor (BDNF) —a neurotrophin that promotes the growth of new brain cells, supports memory and learning, and regulates mood. They also showed a 22% increase in cerebral blood flow (which, in addition to helping your brain function optimally in the short-term, also lowers your risk of cognitive decline in the long-term). There’s evidence that a keto diet may help you lose weight, clean up dead and damaged cells , and improve insulin sensitivity and blood glucose response. This study adds to the body of research suggesting keto isn’t just a fad or crash diet but can be a longevity tool when used correctly . 🏃 I don’t recommend going keto long-term because of the lack of evidence supporting its value when used this way. However, I sometimes prescribe a 1-week “keto sprint” for my patients who need a metabolic reset or are dealing with persistent symptoms of inflammation like brain fog. I share my protocol in detail in my book if you want to learn more! ❤️ Studies show being in a ketogenic state can improve cholesterol—for some. For others, a keto diet can send LDL cholesterol running wildly in the wrong direction; I always pair keto sprints with proactive lab testing to make sure we’re keeping heart health metrics in check. #2 A proven way to build bone mass One of the things I see so many of my patients in their 40s, 50s, and 60s struggle with asking is how can I actually build bone? Nothing builds bone mass like high-impact exercise. So I was super excited to see new research showing HIIT workouts can be made twice as effective at building bone mass when paired with a vitamin D supplement. Sedentary women ages 30-50 enrolled in a 16-week program including HIIT workouts and 800IU of daily vitamin D showed with a 3.2% improvement in hip bone mineral density. That’s huge considering the 1-year mortality rate for women who break a hip is 19.7% . Bone loss is one of the most significant factors contributing to reduced healthspan as we age—especially for women. We lose 2-3% of our bone mass each year starting in menopause. HRT helps protect against this loss, which is a huge step towards staying healthy into your 70s. But to be healthier than ever, we need to be building bone throughout our lives, ideally from our 20s on, and especially in our 40s and 50s. I know I personally need to be doing more HIIT workouts but honestly I struggle with finding the time. If you’re like me and getting to a regular Barry’s class is just not happening, I’m a big fan of at-home HIIT classes: Rocamoon is a mom of 3 who looks amazing and has fun positive vibes. (Personally, I’m not into being yelled at when I exercise.) Caroline Girvan inspires me to incorporate more heavy weights. Kirsty Godso can always be counted on to leave me completely exhausted when I want a challenge. Patrick Frost is great at helping me shake myself out of a workout rut. How to be Healthier Than Ever This Week 🥶 Take the plunge: If you’re ready to dip a toe into cold plunging, Ice Pod makes a super barebones plunge starting at $89. If you want to go straight to the high end, the Morozko ice bath actually makes its own ice. Plus, it self-sanitizes with microfiltration and ozone disinfection. 🍄 Be a Hiro: My household recently reached a huge milestone in that everyone is potty-trained! It’s hard to believe! But I am so impressed by Hiro Diapers , which are the first truly eco-friendly but high-performance disposable diapers, that I almost wish I still had a little one who needed them. Diapers are the #3 contributors to landfills and can take up to 500 years to decompose. Hiro diapers come with a plastic-eating fungi packet that starts digesting them after just a few weeks. Use code mycelia-parsley for 40% off! ⏳Test time: I shared on Instagram why I’m so excited about testing my epigenetic age (and will post my results when I get them). Get a TallyAge kit and test with me! Keep Reading How Much Does Vigorous Exercise Really Matter? Chronological vs. Biological Age: Which One Really Matters? If You Only Fix One Thing for Longevity, Make It Your Mitochondria. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The breathing habit that will transform your health overnight.
URL: https://www.robinberzinmd.com/the-breathing-habit-that-will-transform-your-health-overnight/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: Did you know that you have a signature breathing pattern akin to your fingerprint that can be used to identify you with 96.8% accuracy? We are how we breat
Plus, the reason I stopped getting botox and the best thing you can do for your metabolic health. Robin’s Short Version Your Breath ID: Your nasal airflow pattern can identify you with 96.8% accuracy and predict BMI, anxiety, and cognitive traits. Sleep Apnea Fix: Simply keeping your mouth closed during sleep raised airflow by 28% in apnea patients—no device or prescription needed. Nitric Oxide Effect: Nasal breathing produces nitric oxide in the sinuses, dilating blood vessels and shifting your body into a calming parasympathetic state. Did you know that you have a signature breathing pattern akin to your fingerprint that can be used to identify you with 96.8% accuracy? We are how we breathe, according to a study published this month in Current Biology . Your signature nasal airflow pattern—your “breath print”—can also be used to predict your body mass index, anxiety level, and cognitive traits. I’ve been fascinated with airway medicine since James Nestor came out with his book Breath: The New Science of a Lost Art in 2020. An estimated 50% of us are mouth breathers. It’s an evolutionary change due to: 🍪 The shift from tough, fibrous foods to processed, soft diets, which has led to underdeveloped facial bones, and smaller mouths and jaws. 👃 Chronic nasal blockages due to allergens and pollution. 🫁 Narrowing of the airway due to chronic inflammation from food and environmental allergens, high-sugar diets, and chronic stress; being in a heightened state of sympathetic tone all the time can constrict your airway without you even realizing it. 😴 Habitual mouth breathing during sleep, which also decreases airway tone. Mouth breathing has huge consequences for our health. It leads to: ❌ Sleep disorders including sleep apnea. Mouth breathing exacerbates airway collapse; a 2024 study among patients with obstructive sleep apnea found that simply closing the mouth increased airflow by 28% overall. ❌ Reduced cognitive function. FMRI studies show reduced activation in key brain regions, including the frontal lobe, cerebellum and parietal lobe. (In my practice, I’ve had patients with adult ADHD experience significant improvement in symptoms after seeing an airway medicine specialist to treat breathing issues.) ❌ Chronic fatigue and brain fog: Reduced oxygen efficiency overnight can can cause frequent micro-arousals that fragment deep sleep so you wake up feeling unrefreshed and foggy. ❌ Higher blood pressure: Studies show nasal breathing has a modest but impactful effect on lowering diastolic blood pressure and improving sympathetic nerve tone. ❌ Poor metabolic health outcomes: Snoring and sleep-disordered breathing in early childhood increases the risk of obesity and metabolic syndrome in adulthood. ❌ Cavities, gum disease, and halitosis: Mouth breathing alters the oral microbiota, which can lead to gum disease and plaque. ❌ Altered craniofacial development in kids: This can lead to increased risk of TMJ, breathing problems, and sleep apnea in adulthood. Breathing through your nose, meanwhile, promotes health by: ✅ Filtering, humidifying, and warming air to help maintain healthier lungs. And helps prevent allergies and illness. ✅ Producing nitric oxide in the sinuses. Nitric oxide dilates blood vessels and helps oxygen travel more efficiently through the bloodstream, meaning better oxygen delivery to tissues. ✅ Improving HRV and lowering cortisol. Slow nasal breathing helps shift the body into a “rest and digest” parasympathetic state. ✅ Improving sleep quality so you feel more rested. ✅ Supporting greater brain activity in the prefrontal cortex, which improves memory, focus, and emotional regulation. This topic came into focus last year when I was struggling to figure out why my son was chronically congested and mouth breathing at night. As a gluten-free, dairy-free house, I couldn’t figure out what was causing his constant post-nasal drip. In addition to working with a functional medicine pediatrician (it’s hard to be your own kid’s doctor and I didn’t want to miss anything) who helped me identify an egg allergy, I dove into why he was mouth breathing with a visit to The Gelb Center , a team of dentists specializing in various aspects of airway medicine, in NYC. This revealed his mouth breathing was also the result of a high arched palate and crossbite. We are now on the palate expander journey and have seen an improvement in his mouth breathing and congestion symptoms already in only a couple of months of using it (and being egg-free). It turns out that the majority of us are mouth breathers, especially during sleep—including me. I went 40 years without realizing this! I don’t breathe through my mouth during the day and I don’t snore (so says my husband) so I’d never flagged nocturnal mouth breathing as a personal health risk. But as my son was going through all of this, I realized I often wake up with a dry mouth—especially If I drink alcohol—which is a sign you’re breathing through your mouth at night. In a self-experiment, I tried using mouth tape for a week and, sure enough, the problem is so much better. (Now I’m a convert.) A CT scan at Gelb revealed I too have a high arched palate (probably from sucking my thumb as a kid) and slight airway narrowing that impacts the way I breathe. So, what can you do? I see people with constricted airways and breathing issues a lot in my practice. The good news is that mouth breathing and airway issues are often solvable. Sometimes, the habit is the result of an anatomical issue and medical or surgical intervention is needed, but for most of us, behavioral retraining, airway support, and resolving the root cause of congestion and nasal inflammation, are what it takes. 👃 Address nasal congestion. The first step is working with a functional medicine provider to figure out what’s causing your mouth breathing—for most of us, it’s chronic inflammation. A functional doctor can help you get to the root cause, whether it’s food sensitivity, environmental allergen, chronic stress, or a microbiome imbalance. 🧘 Nasal breathing exercises. Pranayama (aka alternate nostril) breathing helps strengthen nasal airways and promote parasympathetic balance. A similar exercise called the Buteyko Method involves breathing through the nose with slow, shallow breaths to build CO₂ tolerance. 🍸 Avoid alcohol. Alcohol is a muscle relaxant. Even one drink a couple of hours before bed can make your airway more likely to narrow or collapse (i.e. obstructive sleep apnea) while you sleep. 👄 Mouth tape. If your nasal passages are clear, using mouth tape can retrain you to breathe through your nose while you sleep. I like the one from Skinny Confidential but you can also just use medical tape. If you notice a change (e.g. you feel more rested, less foggy) after a week, you were probably mouth breathing. 🛌 Do an at-home sleep study. There are great at-home sleep studies now. The one we prescribe at Parsley is AccuSom, which uses a portable battery-powered unit to record breathing patterns and oxygen levels. 🦷 Find an airway literate dentist for your kids. Once we develop habits, we tend to stay in them. Given mouth breathing is so common among kids (especially those who suck their thumbs) I wish I’d done this sooner. I’ve also learned a lot from Hillary Fritsch , DMD, a dentist in Montana who specializes in airway issues. What’s In My Group Chat #1 Microneedling for optimal skin health I recently came across this article on at-home microneedling. My long-term esthetician Lisa Shannon completely changed my approach to skincare in my 40s. She has me on a program to help me build up my skin’s natural resilience through enhancing my own elastin and collagen production. Through my work with her, I stopped getting botox two years ago. I started to question the long-term impact of botox and whether there was a better way to support my skin’s aging. Botox gives you “botox face” over time—it paralyzes certain muscles in your face, so other muscles have to overcompensate. Long-term, those paralyzed muscles atrophy while the ones picking up the slack become hypertrophied. I don’t love how it changes facial architecture. I also think I’m subconsciously hoping there is a better way—that science will deliver something better soon. I mean, if Kris Jenner’s facelift is any indication of where aesthetic medicine is heading, all I can say is… wow . I’m holding out as long as I can for the science to keep improving! For now, I’m focusing on promoting my skin’s production of elastin and collagen through high dose vitamin A based products (NOT retinoids) and with microneedling, which is backed by a body of high-quality research. Microneedling has been shown to: Stimulate collagen and elastin production. Controlled micro-injuries trigger the body’s wound-healing response, boosting type I and III collagen and elastin. Reduce acne scars. Over time, that process helps reduce scarring by rebuilding the dermal matrix. Improve fine lines and wrinkles. Especially around the eyes, mouth and forehead. Reduce hyperpigmentation. Facilitates deeper penetration of skin care products containing ingredients like tranexamic acid, vitamin C, and kojic acid. At-home dermarolling results aren’t quite as impactful as the microneedling treatments you can get in-office (which are often paired with radiofrequency) but they do work; used regularly, they take the penetration of your skincare products from 5% to close to 80%, so you see better results. (Reminder: most of what you’re putting on your face just sits there. The skin is an organ of digestion—demarollers help products get into the skin to be used.) I’ll dive more into skin health in another post, but for now my favorite home dermaroller is below! #2 Type 2 diabetes is reversible I’ll never forget years ago reading that the American Diabetes Association was promoting bariatric surgery as a method to reverse diabetes and thinking, Wow, we would rather cut out part of our stomachs than change how we eat. My head spun. More of us are in the metabolic danger zone than we realize—recent estimates say nearly 40% of adults in the US have prediabetes but only about 20% of them know it. The fact is that type 2 diabetes is a lifestyle driven disease far more than it is caused by our genetics, which only dictate about 10% of our health. Yet the medical system at the time (and still in many cases to this day) was more interested in prescribing a drug or a major surgery than addressing the root cause. So not to be like, I told you so , but…it was gratifying and a huge “DUH” moment to read this recent study published in BMC Medicine , which found evidence that diabetes is a mostly reversible disease . People with newly diagnosed type 2 diabetes or prediabetes were put on a treatment plan that included medications for diabetes and weight loss. A test group was also put on a lifestyle program including: A high-protein diet (25% of daily calories) 30 minutes of exercise 5x per week After 12 months, 87% of people in the lifestyle program were declared in remission, compared to 17% of those receiving standard car e. For those with prediabetes, 73% of participants returned to normal blood glucose levels, compared to just 8% in the standard care group. That’s a major difference! For those of us paying attention to root cause medicine, this is a “duh” finding. But it’s also a really important one that underscores how much lifestyle choices matter! Getting 150 minutes of moderate-intensity exercise per week, maintaining a healthy weight, and eating enough protein can literally add years to your life! How to Be Healthier Than Ever 🍯 Immune boosting honey: I don’t like adding sugar to things but if I’m going to, I use honey, which has some immune-boosting and anti-inflammatory benefits. I recently got into Manukora honey, which has prebiotics and a high concentration of antibacterial methylglyoxal. 💉 My favorite dermaroller: I use the Cosmetic Roll-CIT ! If you want a fancier version, the Gold Roll-CIT is plated in 14k gold and has twice the number of microneedles. 🧬 Check your biometrics: I just shared the 7 biometrics every woman should be tracking on my Instagram and the post is getting a lot of traction. Look out for an in-depth guide coming soon.. Keep Reading The best “calm tech” to hack your vagus nerve How to reduce stress in 15-minutes Is Sleep Consistency the Most Overlooked Lever of Longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Should we all be microdosing GLP-1?
URL: https://www.robinberzinmd.com/microdosing-glp-1/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: If you’re frustrated that your body composition isn’t changing, microdosing GLP-1 might be the key.
Just when we thought the obsession had died down, GLP-1s are in the news again. 98 million Americans have prediabetes (and 80% don’t know it ). No wonder everyone is talking about microdosing GLP-1 and a recent Wall Street Journal article is calling for putting GLP-1s in the water. Robin’s Short Version True Microdose Defined: A real microdose is one-third to one-half the lowest recommended dose, taken just 1–2 times per week, not daily. Muscle Loss Risk Remains: Even at microdose levels, GLP-1s carry the same lean muscle loss risk, making protein intake and strength training non-negotiable. Your Body Makes GLP-1: Processed foods, microbiome disruption, and low phytonutrient intake suppress natural GLP-1 — try diet changes for 4–6 weeks before going prescription. 🤓 What to know: More experts say everyone should use GLP-1s, but it’s controversial. Last week, pharmaceutical company Novo Nordisk broke up with digital health company Hims & Hers over selling compounded, i.e. non-branded, versions of the drug; excitement is building over the development of oral versions of GLP-1s in the pipeline ; and outright fights are breaking out in my Instagram comments over GLP-1 alternatives and supplements. People are fired up and I don’t think the conversation is dying out any time soon. Many in my medical community call GLP-1s miracle drugs for diabetes, heart disease, cancer, and even cognitive decline. Meanwhile skeptics in my functional medicine world argue they’re just a band-aid for a broken food system. Now, the longevity crowd is buzzing about GLP-1s’ potential to reduce oxidative stress and boost mitochondrial function to become our biggest anti-aging drug yet. (More research is needed to see if this actually leads to any material gains in healthspan.) Are you missing out if you’re not using some form of GLP-1 yet? Personally, I don’t think we should be putting GLP-1s in the water. But I do think more of us can benefit from understanding how to use them to make our lives a little healthier. 💪 What to do: Microdose GLP-1 the right way. “Microdosing” is a bit of a misnomer. A microdose of a GLP-1 receptor agonist like tirzepatide is usually one-third to one-half the lowest recommended dose taken 1-2 times a week. A lot of people are doing it. For people looking to lose the last 10 or so pounds or to curb cravings for sugar and alcohol, I find microdosing GLP-1 often works quite well. It reduces appetite with fewer GI issues (but, fyi, still comes with the same risks of losing lean muscle mass if you don’t prioritize protein intake and strength training). The best way to “microdose,” in my view, is to boost your body’s own GLP-1 production. People forget we make our own GLP-1. Our bodies are not defective—we didn’t evolve needing these drugs. The problem is: 🍫Processed foods that hijack our natural satiety signals 🦠Changes to our microbiome that cause inflammation and reduce SCFAs like butyrate key for GLP-1 secretion 🌱A lack of key phytonutrients like curcumin and berberine that mean we make less GLP-1 hormone than we could have 100 years ago While the GLP-1 your body produces breaks down faster than the injectable stuff (medications are designed to resist enzymatic breakdown in the gut and are therefore more potent) it still works. If you’re frustrated that your body composition isn’t changing despite cutting out all ultraprocessed foods and fitting gym time into your crazy schedule, microdosing GLP-1 might be the key. Try the below changes for 4-6 weeks to maximize your internal GLP-1 production first. If you’re still not seeing results, talk to your provider about a microdose. Super-dose your natural GLP-1 with fiber, protein, strength training, and supplement support: CTA: Know someone on the fence about GLP-1s? Forward this newsletter — and give them some options to consider! Lightning Round 1. Metabolism is a surprising driver of fertility issues I recently sat down with my friend Dr. Darshan Shah to talk about medical gaslighting, why “normal” labs fail women, and the role of GLP-1s in menopause for his podcast. My favorite takeaway: many women labeled “fertility-challenged” are actually experiencing metabolic dysregulation. Even slightly elevated blood sugar can disrupt reproductive hormones. If you’re on a fertility journey, gaining weight in perimenopause, or just want to understand your metabolism better, this one’s for you. 🎧 Listen here ! 2. Weighted vests build bones Wearing a weighted vest on a 45 minute walk will help you burn about 17 extra calories . That’s it. But that is not the point! The best use of a weighted vest is actually to help you build bone density— which we lose 10-20% of during perimenopause and menopause . So many women I know pay plenty of attention to calories but almost none to bone density. That’s why I’m texting all my friends this link this week. Who wants to join us in wearing a weighted vest for some high-impact exercise? 🦴 Get one here ! 3. The new supplement in my stack helping me microdose We just launched Parsley’s new GLP-Metabolic Support supplement and I’m so into it. It’s formulated with: Magnesium citrate (regulates blood sugar and reduces gut inflammation) Green coffee bean extract (chlorogenic acids help regulate blood sugar, reduce inflammation, and may increase GLP-1 levels) Plant-based polyphenols sourced from lemon verbena and hibiscus extracts (activate AMPK, a key metabolic switch that helps the body burn fat and improve energy efficiency). Add this to a high protein, high fiber and ultraprocessed food free diet and you might be able to skip the microdose. 🛒 Get it here ! 💛 The Momgevity Files This week’s camp drop off was a big longevity motivation moment for me. I dropped my 8-year-old at sleep-away camp last weekend. He sprinted toward bunk beds; I ugly-cried into my steering wheel, then again in yoga. 🤸‍♀️ Cue existential math: when he turns 80, I won’t be there, no matter how many peptides I inject or weighted vests I wear. That gut-punch is also fuel to make sure I am still thriving when he drops his kids off at sleep-away camp—every rep, macro, and microdose is about feeling vibrant now so I can pack more memories into our overlapping years. Momgevity mission = ON. Stay strong, stay curious, and breathe— Robin 🩺✨ Keep Reading All your questions answered about Ozempic and GLP-1s 4 fasting for women strategies to optimize longevity. Metabolic flexibility: The secret engine behind energy, fat loss, and longevity. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Why everyone 30+ needs a DEXA scan
URL: https://www.robinberzinmd.com/why-everyone-over-30-needs-a-dexa-scan/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: 1 in 4 women 35-50 have osteopenia. If you’re over 30 you should be getting a DEXA scan with full body comp every 1-2 years. Here’s why.
1 in 4 women 35–50 have low bone density. I’m one of them. I turned 44 recently and got a surprise gift: osteopenia. Robin’s Short Version Earlier Than Expected: 1 in 4 women ages 35–50 already have low bone density, years before menopause accelerates loss by 10–20%. Muscle Mass Stakes: Women with low muscle mass are 63 times more likely to die early — making body composition as critical as bone density to track. DEXA Scan Protocol: Always request full body composition data, since insurance typically only covers bone, and confirm a radiologist is on site. I’m one of the 26% of women 35-50 who have low bone density ( Journal of the American Osteopathic Association 2019). After menopause? Over half of women have it. My husband likes to joke that if I fall over I’ll break, which just got a little too real. A full-body DEXA scan (10/10 recommend) gave me the reality check I didn’t know I needed. The good news: You can build new bone if you start early. 🤓 What to know: Muscle + bone = longevity power. Muscle mass gets all the hype for good reason: Women over with low muscle mass are 63 times more likely to die early than their stronger counterparts . For men, the risk jumps 11x. ( Journal of Bone and Mineral Research 2019). But bone density is just as crucial: Women lose 10-20% of their total bone mass after menopause. Osteoporosis is 5x more likely in women 50+ than men. Women who fracture a hip have a 20% risk of dying within a year. 💪What to do: Get a DEXA scan if you’re over 30. I lift weights, take my supplements, and track my hormones like it’s my side hustle. Still, my hips came back with a T-score of –1.8. Translation: low bone mass. Everyone over 30 should have at least one full-body DEXA scan. By 35, you should be getting a DEXA with full body comp every 1-2 years. A DEXA scan measures bone mineral density plus body composition (lean vs. fat mass). It’s: Non-invasive 20 minutes max Less radiation than a dental X-ray $75–$250 if paying out of pocket Your doctor can order one for you or you can find them at sports medicine and longevity clinics, fancy recovery studios, and gyms. ⚠️Important tips: Make sure to ask for body composition data; insurance usually only covers the basic bone part. Make sure the facility has a radiologist (or it’s not a real DEXA) Consumer body composition tests (i.e InBody) ≠ DEXA (they don’t measure bone) 🎯 What you’re aiming for Bone Density (T-score): +1 to –1 = Normal, –1 to –2.5 = Osteopenia, Below –2.5 = Osteoporosis Lean Muscle Mass: 70–75% of total body mass = optimal for women, 80–85% = optimal for men My stats? 72% lean, 24% fat. Pretty good. But to future-proof my body, I need more muscle. And that means gaining weight. Look out for my bone-building protocol later this summer: weight training, creatine, rebounders, and some very nerdy tools I can’t wait to share! ⚡ Lightning Round 🥣 Fasting Reset: This year I used Prolon’s 5-Day Fasting Mimicking Program for my annual cleanse. It’s science-backed and a great way to get the benefits of autophagy (your body’s cellular clean-up crew), reduced inflammation, and reduced cancer risk without the hanger. [Try it with this link and get 30% off!] 🦠 Gut Health: 70–80% of your immune system lives in your gut. I joined SuppCo as their gut health expert because I’ve seen over and over how optimizing your microbiome can transform everything from energy levels to mental clarity. [Get my gut health protocols based on our Parsley treatments at SuppCo !] 🪲 Tick Tip: Lyme risk is way up this summer. 200 mg of Doxycycline within 24 hours can stop Lyme disease. Ask your doctor for a just-in-case script. [ WSJ has extra tick tips!] 💛 The Momgevity Files This Fourth of July gave me two humbling reminders that as much as I’d love to control every variable…I can’t. I’m meticulous about what my kids eat, what their toothbrushes are made of, and what goes into (and on) their bodies. So when my 8-year-old, off at his first sleepaway camp, told me he had Fruit Loops for breakfast? I nearly fell off my chair. My first instinct was to email the camp director: Where’s the protein?! Then I remembered: the only time I got to pick my cereal as a kid was on summer beach trips. Fruit Loops. Lucky Charms. Cocoa Puffs. I turned out okay. Later that day, my 5-year-old—seemingly born without a fear gene—swam halfway across a huge lake, beaming. I flailed on the shore like air traffic control, motioning to my husband to shadow her. She was fine, wearing floaties, but when she swallowed too much water, I dove in myself. That tension between protecting them and letting them stretch? So real. It mirrors a truth I keep bumping into: I can take the tests, eat the right foods, do the fasts and still have to let go sometimes. Next week I’ll be at the beach, eating lobster rolls, sipping a cold (gluten-free) beer, reminding myself perfection isn’t the goal. Wholeness is. And sometimes that means watching your kid choose Fruit Loops and swim out on their own. Here’s to health and trust, structure and softness, and knowing when to loosen the grip. See you next week 🫶 Robin Keep Reading Your bone density blueprint. 100 Essential Labs Every Woman Should Be Tracking Brain, bones, booty: 3 things to take care of before you reach menopause. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Your bone density blueprint
URL: https://www.robinberzinmd.com/your-bone-density-blueprint/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: The official guidelines on bone health are bananas to me. Women lose 10-20% of their total bone mass in their 40s and 50s. So the fact that most guideli
The official guidelines on bone health are bananas to me. Women lose 10-20% of their total bone mass in their 40s and 50s. Robin’s Short Version Screen Before 65: Most women lose 10–20% of bone mass in their 40s and 50s, yet standard DEXA screening doesn’t start until 65. Lift and Impact: Squats and deadlifts 3x per week can raise bone density 3–5%; rebounding just 2x weekly shows measurable results in 12 weeks. Start HRT Early: Beginning hormone replacement therapy in perimenopause can increase bone mineral density by 10% and significantly cut fracture risk. So the fact that most guidelines don’t recommend a DEXA scan until 65 is a travesty. Last week I shared that at 44, I already have osteopenia. (Read about it here if you missed it!) This week: I’m diving into what I’m doing about it—and why your 30s, 40s, and 50s are the most powerful time to protect your bones for life. 🤓 What to know: The best time to build new bone is yesterday. We tend to think of bone loss as a “later” problem. But… 📉 Most women hit peak bone mass by age 30. After that, we start to lose more than we build. A few major life stages can accelerate that loss: Pregnancy: Your baby’s development increases calcium needs dramatically. If your diet can’t keep up, your body pulls it from your bones ( Annals of the New York Academy of Sciences , 2021) Breastfeeding: Estrogen dips, calcium leaves with milk, and bone density can drop by 5–10% in just months ( Journal of Perinatal Education , 2005). Menopause: The estrogen cliff hits and 1 in 2 women over 50 ends up with low bone density ( Journal of the American Osteopathic Association 2019). 💪 What to do: Weight train, eat right, support with supplements, add HRT. 🏋️‍♀️ Add weights, trampolines, and impact. Bones aren’t static, they’re living tissues. To grow stronger, they need stress. Specifically: Axial load —force applied vertically through the bone via weight-bearing or impact activities. Resistance training: Compounded exercises like squats and deadlifts 3x per week can boost BMD by 3-5% ( Journal of Strength and Conditioning Research , 2013). Impact sports: Think: jogging, jumping rope, even box jumps. Any impact that “challenges” your bones has been shown to increase BMD ( Sports Health ). Rebounders: Mini trampoline workouts (45-60 min 2x per week) can improve bone density in just 12 weeks ( Clinical Interventions in Aging , 2019). Whole body vibration: A Power Plate can increase lower body strength, improve circulation, and increase bone mineral density—even in women with osteoporosis ( Brazilian Journal of Medical and Biological Research , 2024). Cutting-edge tech: The BioDensity machine adds compressive force to 4 compounded exercises to target total body bone density, build muscle, and lower blood glucose. ⚠️ Not for bones: Yoga or Pilates Walking (unless you add weight) Bodyweight workouts (unless they involve jumping) 🥦 Eat your veggies. Veggies = Strong bones: 9 servings of veggies per day decreases calcium loss ( Nutrients , 2015) Focus on veggies high in calcium like broccoli, kale, and collard greens ⚠️ Avoid high-fat, high-sugar, and calorie-restricted diets—they tank BMD ( Nutrients , 2024) 💊 Supplement with calcium, magnesium, and strontium after 30. While food comes first, here’s what research supports: Calcium : look for MCHC paired with phosphorus like AlgeCal Plus or Metagenics’ Bone Builder Plus . Magnesium glycinate : boosted BMD in 71% of women ( BioMetals , 2021). Strontium: 600 mg/day cut the risk of fractures in half ( International Journal of Molecular Sciences , 2021) I test supplements with my patients and always start low and go slow. ⚖️ Hormone replacement therapy: Test early. Start early. Estrogen helps regulate the cells that build and break down bone. When levels fall during perimenopause and menopause, bone loss accelerates. HRT can increase BMD by 10% and significantly lower the risk of osteopenia and fractures ( Menopause , 2023) Short answer: consider it early. ❌ Drug therapies aren’t a forever fix. Bone meds like bisphosphonates ( Fosamax ), monoclonal antibodies ( Prolia ), and anabolic agents ( Forteo , Evenity ) can help slow or reverse bone loss—but they come with caveats. Side effects may include GI issues, jaw complications, and concerns from long-term use (especially in animal studies). Stopping suddenly? That can trigger rapid bone loss and rebound fractures. For these reasons, I don’t prescribe them. ⚡ Quick Hits 💪 The women leading longevity: I was so excited to be included on Women’s Health’s list of women redefining longevity for their 20th Anniversary issue. We need health maps built for women—not retrofitted from men. [See the full list here ] 🚶‍♀️Japanese walking builds muscle: “Japanese walking”—aka HIIT walking—3 min fast, 3 min slow for 30 min, lowers BP and builds muscle vs. walking at a steady pace. [ The Washington Post dives into the research behind the latest TikTok trend] 🍄 Microdosing moms might live longer: Therapeutic psychedelic treatment can be a powerful tool for mental wellbeing. New research says psilocybin might also be a powerful longevity drug—it increased the lifespan of human lung and skin cells by over 50% in a new study. [Read it here ] 💛 The Momgevity Files Last week, while I was out to dinner, my two youngest (ages 3 and 5) found scissors and gave themselves haircuts. My daughter had lopsided bangs. My son trimmed right up to the scalp. When I got home and saw the results, I was furious—irrationally so. Not just annoyed, but that mom-rage cocktail of frustration, blame (my husband was on duty 😅), and that deep, quiet panic that maybe everything’s falling apart . They were asleep, so I texted a few mom friends for backup. In an age of Dr. Becky, we’re all trying to be “conscious parents,” so no yelling. No shame. Their advice: Talk calmly in the morning Emphasize scissor safety, not punishment Accept that kids will experiment—and sometimes scare us in the process. (Oof, there’s that letting go feeling again.) By morning, I had a plan and even rehearsed my lines. We hugged. We talked about scissor safety. We went to the barber. They actually looked kind of adorable. Hair-gate 2025 was a good reminder: it’s okay to phone a friend. As a mom juggling family, a company, patients and my own health, a lot of the time I feel like I should have all the answers. So when something goes sideways—even something as superficial as a 5-year-old’s DIY haircut—it can trigger that deep “the wheels are coming off the wagon” feeling. Anyone else? In a world where it feels like everything you need to know to live optimally is already available on ChatGPT, this moment gave me an even deeper appreciation for community. (Thank you Jesse, Rachel, Brent, and Kate 💛) Remember that research showing people with strong social ties live 50% longer than those without? You don’t need to have all the answers for your health, your kids, or your life right now . It’s not just okay to ask for help—it’s vital. So phone a friend. Book the lab review. Get support for your bone plan. We’re not meant to do this alone. In fact, we live longer when we don’t. Stay strong, stay curious, and breathe— Robin Keep Reading Why everyone 30+ needs a DEXA scan. Is estrogen the ultimate longevity drug? Why so many women are using creatine (including me) Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is it worth $2,500 to catch disease before it starts?
URL: https://www.robinberzinmd.com/should-i-get-a-full-body-mri/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: My MRI found a kidney tumor. Here’s what I’m doing next and what I recommend for you to get the most out of your health data.
My MRI found a kidney tumor. Here’s what I’m doing next. Robin’s Short Version No Radiation Risk: MRI uses magnets instead of X-rays, making it safe to repeat every one to two years to build a trackable health baseline. Dense Breasts Gap: When breast tissue is more than 50% glandular, standard mammograms lose sensitivity — adding ultrasound or MRI to your protocol closes that gap. Benign Doesn’t Mean Ignore: A small kidney angiomyolipoma needs no treatment now, but can impair kidney function if it grows, making ongoing monitoring essential. Would you pay $2,500 to know what’s really going on inside your body? Ten years ago, if you’d told me I’d voluntarily climb into a loud metal tube for an informational MRI I’d have laughed in your face. And yet, here we are. I’ve done two full-body MRIs, most recently with Prenuvo . Not only did I survive (I watched Sex and the City reruns the whole time and can confirm: Samantha Jones is still iconic), I found out about a benign kidney tumor. I’m all about proactive findings like this. The reactive model of medicine, which has us waiting in the dark until something goes wrong, is just as crazy to me as bloodletting with leaches. Let’s break down what full-body MRIs do , what they don’t , and whether they’re worth it. 🤓 What to know: Full-body MRI used to be fringe. Not anymore. Most of us (including me) once saw whole-body scans as high-cost, low-yield. Newer models like Prenuvo and Ezra are changing the game: 🧲 No radiation (MRI = magnets, not X-rays) ⏱ ~45 min scan 👩‍⚕️ Radiologist-reviewed, diagnostic quality 🧾 Categorized findings: benign → urgent 💰~$2,500 (not insurance-covered, but HSA/FSA eligible) These scans won’t give you all the answers—but they will give you more informed questions. I got the scan because last year’s MRI found a thyroid nodule I was eager to check up on and because I want to continue building a baseline for future tracking. What the actual scan is like Prenuvo’s setup was significantly better than Ezra’s (which I used last year), designed to feel calm and streamlined: Private changing area Soft loungewear Wide, open MRI machine (not at all coffin-like) And yes, there was Netflix. I watched Sex and the City, Season 1 ; honestly you could have left me in there for another hour. What my scan found ✅ Informational (no action needed right now) Breast tissue : >50% dense glandular. Dense breast tissue is very common and means mammograms are less sensitive—if this is you, talk to your provider about adding ultrasound or MRI. Uterus : Normal 9mm endometrial lining. No action needed, but helpful to know for the future. ⚠️ Actionable (I’m monitoring over time) Kidney tumor : A benign angiomyolipoma. Small and symptom-free, but these can affect kidney function if they grow. I’ll be monitoring. Thyroid nodule : Still too small to biopsy (<1.5 cm) and hasn’t changed since my last MRI. With thyroid issues affecting up to 1 in 5 women, I also track my thyroid labs annually with Parsley. Baker’s cysts (knees) : Linked to joint overuse. Not urgent, but I’m adjusting how I train to protect long-term joint health. 💪 What to do: Consider a full-body MRI every 1-2 years. These scans aren’t for everyone. I definitely have patients for whom this kind of information is psychologically too much to handle. But for some people, they offer a new layer of insight that many of us are coming to expect. I think of it as banking body data for your future self. You might consider a full-body MRI if: ✅ You’re tracking prior findings ✅ You have a family history of cancer or neurodegenerative disease ✅ You want a midlife health baseline ✅ You’re the type who just likes to know stuff Answers to your most-asked MRI questions Radiation risk? None. MRI = magnets, not X-rays. Is it legit? Yes. Diagnostic-quality, full-body scan, read by a board-certified radiologist. What about false positives and “too much info”? Prenuvo ranks each finding by risk and gives a detailed report showing what’s benign, what to watch, and what needs action. From there, your Parsley doctor or regular doctor helps you verify a diagnosis and manage any unexpected information. Cost? $2,500. Not covered by insurance (yet), but HSA/FSA-eligible. Parsley members get a discount. Do I still need a mammogram? Yes. This is a “yes and” situation. More data = smarter decisions. How often should I do this? Every 1–2 years if you’re prevention-minded or managing known risks. Can I get a partial scan? Yes. Some companies offer a torso-only or torso + head version that are cheaper and slightly faster. But personally? If I’m crawling into a giant metal tube, I want the full picture. Will AI make this better? Absolutely. Advances in AI will improve how we interpret MRI data, making your body scan even more useful over time. ⚡ Quick hits 🧴 Clean beauty crackdown The average American woman is exposed to 168 chemicals (including parabens, formaldehyde, and mercury!) from personal care products every day. The newly introduced Safer Beauty Bill Package will (hopefully!) get the U.S. caught up with Europe on cleaner beauty. Until then, my favorite non-toxic makeup brands are Merit and Ilia . ☕ Black coffee might extend your lifespan A large new study found coffee drinkers are 17% less likely to die early . But! The coffee has to be black or minimally sweetened to get the benefit. I am so beholden to my daily double black espresso that I packed my Breville for our family vacation. 🧪 The lab test most women aren’t getting (but should) Homocysteine. It’s a marker of methylation, cardiovascular risk, and even brain health. I check it in all of my patients at Parsley. 🩸 100+ data points, 2x a year, $495 Parsley’s Comprehensive Diagnostic Panel for women is here! It includes hormones, inflammation, metabolic markers, nutrient status + more. See everything included here . 💛 The Momgeviy Files This week I’m writing from the beach—my family’s sacred summer spot. It’s nostalgic, sandy, salty, windy and deeply joyful. On day one, I found myself driving my kids toward the waves and saying out loud, “I’m so happy.” From the backseat: “I’m so happy too!” I thought about this for a moment, remembering my own family trips here when I was a kid. Both of my parents worked a lot (my mom was a lawyer and my dad was a doctor) and the two weeks at the beach were a time when we were all pretty carefree and present. There was no need to solve anything or be anywhere else. As someone who focuses a lot on all the things I want to fix or improve—whether it’s the sourcing of the food my kids are eating, the way I’m strength training, or how I’m running my business—I often feel like Mr. Fix-It, constantly in optimization mode, eyes ahead to the next challenge. It’s hard for me to get out of this vibe, especially when my entire work life can come with me to the beach in the palm of my hand. And it’s why trips like this – to places where I feel the most ease and freedom – are so vital. Seeing my kids’ sunny faces in the review mirror reminded me that in our quest for longevity, being able to identify what makes us happy (and then making room for it) is a skill. It also reminded me that when it comes to kids, if I’m happy they’re usually pretty happy too. Stay strong, stay curious, and breathe, Robin Keep Reading Full-Body MRI: Is a $2,500 Scan Worth It? 100 Essential Labs Every Woman Should Be Tracking Your comprehensive preventative health checklist. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## My inside/outside skincare protocol
URL: https://www.robinberzinmd.com/skincare-protocol/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: We tend to think of aging skin as surface-level. It’s not. Here’s the inside-meets-outside skincare protocol that changed my face.
Plus, hot baths and why eating bread feels better in Europe. Robin’s Short Version Fibroblasts Are Central: UV damage, estrogen loss, and Vitamin A deficiency all harm fibroblasts—the cells that produce collagen, elastin, and hyaluronic acid. Menopause Accelerates Collagen Loss: Women can lose up to 30% of dermal collagen in just five years post-menopause, but topical or systemic estrogen therapy can meaningfully slow that decline. Sugar Stiffens Skin: High-glycemic foods trigger glycation, which stiffens collagen and elastin; pairing carbs with protein and fiber prevents the blood sugar spikes that cause sagging and wrinkles. I haven’t gotten botox in two years. I used to get it 1-2 times every year until I couldn’t ignore that nagging “this feels off” feeling. Yes, it works. But Botox is a band-aid. Botox paralyzes targeted muscles. Over time, others compensate and grow, which can shift the architecture of your face. And while I’m not worried about the toxin itself (it breaks down quickly and stays local), the technology already feels outdated. So I stopped. And thanks to my inside/outside regenerative skin protocol? I haven’t missed it. 🤓What to know: Skin ages due to internal and external stressors we can influence. We tend to think of aging skin as surface-level. It’s not. Hormonal changes, free radical damage, chronic inflammation, and nutrient deficiencies all contribute to aging. The good news? You have a lot of control. 🌀 Preserving fibroblasts preserves collagen Fibroblasts (the cells which make collagen, elastin and hyaluronic acid) get damaged by free radicals from UV light, loss of estrogen, and Vitamin A deficiency. Preserving these cells’ function is the number one thing you can do to slow aging. ☀️ Protecting against UV slows skin damage UVA/UVB rays generate free radicals that destroy skin cells. Langerhans cells (your skin’s immune defense) drop with sun exposure. Protecting your skin from the sun prevents skin damage now and protects your skin’s ability to fight future damage later. 🏭 Strengthening the skin barrier blocks pollution damage Pollution generates free radicals and activates enzymes called matrix metalloproteinases (MMPs) that degrade collagen and elastin. Pollutants penetrate pores and hair follicles, triggering low-grade inflammation that can exacerbate existing skin conditions like acne, rosacea, and eczema. A healthy skin barrier prevents fine particulate matter, heavy metals, and toxins from penetrating and triggering inflammation and oxidative stress. 🍭 Preventing blood sugar spikes prevents sagging & wrinkles High-glycemic diets trigger glycation, where sugar stiffens collagen and elastin. Hello, wrinkles. Pairing carbs with protein and fiber prevents spikes and stiffening. ⚖️ Slowing estrogen loss slows aging Women lose up to 30% of dermal collagen in the 5 years after menopause ( Climacteric , 2022). Langerhans cells become less active, increasing risk of dermatitis, photoaging, and skin cancer. Topical or systemic estrogen therapy can slow the loss and protect skin immune function. 🦠 Gut health = skin health Yeast overgrowth and dysbiosis drive systemic inflammation and trigger skin conditions like acne, eczema, and premature aging. Good bugs produce short-chain fatty acids like butyrate, which support skin barrier repair and hydration from the inside out. 💪 What to Do: Target inflammation and hormonal shifts and treat topical damage The most effective skincare is systemic. Here’s my go-to protocol: 🥦 Feed skin with antioxidants, CoQ10, and glutathione Eat a rainbow of fruits and veg (especially kale, bell peppers, sweet potatoes, kiwi, broccoli, avocado, and spinach). Supplement with CoQ10 (supports cellular repair) and NAC (boosts glutathione—the body’s “master antioxidant”). 🚫 Eliminate inflammatory foods like wheat, dairy, and sugar Wheat, dairy, eggs, sugar are the most common breakout triggers for acne, eczema, and psoriasis ( Nutrients , 2023). Cut sugar to < 25g per day. Try a 30-day elimination diet to test your tolerance for gluten, dairy, and eggs. 🧫 Test & treat microbiome balance Aim for 30+ different plants per week (fruits, veggies, legumes, herbs) for microbiome balance. Take the GI Effects stool test or the TioSmart SIBO test (both of which we offer at Parsley Health) help personalize treatment protocols. 💧 Drink 80 oz of water per day Dehydrated skin is more prone to oxidative stress and more vulnerable to oxidants and pollutants. Drink half your body weight in ounces. 🧴 Topicals and treatments that actually work ✅ Vitamin A I prefer a gentle form of vitamin A to more irritating higher-potency formulations. Look for: Retinyl palmitate or retinyl propionate, which are converted to retinoic acid naturally by your skin cells. My go to: Environ . Avoid topical retinol and retinoic acid (more potent but more irritating). ✅ Vitamin C + E Vitamin C is one of the most well-studied topicals for producing collagen while protecting from UV and pollution. Look for: 10-20% L-ascorbic acid Formulas with stabilizing ingredients like vitamin E and ferulic acid ✅ Peptides Peptides stimulate collagen, elastin, glycosaminoglycan and hyaluronic acid synthesis, which reduce inflammation and improve hydration, elasticity, and firmness. Look for: Palmitoyl tripeptides Palmitoyl pentapeptide‑4 (Matrixyl™) Copper peptide GHK‑Cu ✅ Microneedling I use a 0.2mm roller at home, plus in-office sessions 1–2x a year. Microneedling improves product absorption from a base case of 10% to up to 70% and boosts collagen. Plus, controlled micro-injuries trigger the body’s wound-healing response, boosting type I and III collagen and elastin. ✅ Mineral sunscreen Protect your skin without disrupting hormones. I like Good Weather Skin, Babbo Organics, and Beauty Counter for mineral-based, non-toxic sunscreen. If you’re worried about Vitamin D levels, supplement with Vitamin D3, the activated form. ✅ Topical estrogen I recommend a 0.01% compounded estradiol or estriol cream used daily for 12 weeks then 3 days per week for maintenance. (At this low level systemic absorption is low and does not replace your HRT.) Coming soon: My take on radiofrequency, lasers, and energy-based tech! RMBD WELCOME ⚡ Quick Hits Weighted vests for perimenopause : Weighted vests help maintain metabolism during weight loss, per a new study . 🏋️ Up your gravitational loading during perimenopause to fight weight gain and build bone density. Why bread feels better in Europe: European bread often uses simpler ingredients (less flour processing), longer fermentation, and fewer preservatives, which may reduce inflammation and gut issues. 🥖 Look for sourdough or artisan breads with minimal ingredients and long fermentation. Or try baking with imported flours to mimic the Euro effect! Hot baths > saunas: Hot water immersion raises core body temp twice as much as saunas, raises heart rate by 39 bpm, and boosts immune function (+ interleukin-6 levels). 🛁 Aim for a 45 min soak at 105°F. 💛The Momgevity Files Anyone else feel both less healthy and healthier on vacation? I call it the Vacation Paradox. I’m eating way more gluten from the local farm store bakery, drinking more wine than usual, and skipping my regular weight training and reformer Pilates. But… I’m also meditating daily. Spending hours in the ocean, soaking up mood-boosting negative ions. Running after my kids on the beach. Walking obsessively—Japanese-style—with friends I’ve already converted. (If you missed last week’s newsletter, go read it! ) I haven’t opened Zoom in days. And I’m sleeping eight, sometimes nine hours a night. That’s the paradox. We always hear: “I went to Europe, ate pasta and drank wine every day and felt amazing.” It’s not just about the food. It’s the whole environment: higher food quality, fewer additives, more sunshine, more movement, less stress. Nature, joy, and a healthy cortisol rhythm go a long way. Would I drink this much or skip strength training if I lived here year-round? Definitely not. I’d join a gym. But I don’t live here year-round. So today, as soon as I finish writing this, I’m off to pick up my favorite zit-inducing aged blue cheese, a kombucha that has way too much sugar, and a loaf of fresh Einkorn bread. Will I do 40 jump squats before I get in the car to blunt the glucose spike? Yep. But I’m also not feeling guilty. This whole experience feels deeply health-restorative. Longevity-boosting, even. I swear I can feel my telomeres lengthening. Longevity isn’t about perfection. It’s about the full toolkit. For every healthspan-shortening indulgence, there’s a way to counterbalance. And often, to enhance. These slow, sunny, gluten-filled days with my family are the core stuff of life. The moments I’ll hold onto when I’m 99, thanks to everything I do the rest of the year. Knowing I made these memories joyfully is the most health-giving part of all. Stay strong, stay curious, and remember to breathe, Robin Keep Reading My personal microplastics protocol My personal supplement stack. Omega-3 deficiency is as harmful as smoking Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## 100 Essential Labs Every Woman Should Be Tracking
URL: https://www.robinberzinmd.com/essential-longevity-labs-for-women/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: Most standard longevity labs test just 19 biomarkers. To understand women’s health and longevity, we need more—100+.
Plus, air purifiers and a new low for alcohol. Robin’s Short Version Normal Isn’t Optimal: A TSH up to 4.5 is considered “normal,” but fatigue and hair loss often emerge above 2.5. Massive Testing Gap: Standard panels cover only 19 biomarkers, leaving hormones, gut inflammation, heavy metals, and metabolic health untested. Women’s Outsized Risk: Women are 5–8x more likely to develop thyroid disease and 3x more likely to develop autoimmune conditions, yet standard panels rarely screen for either. Women deserve more than 19 data points. Most standard lab panels test just 19 biomarkers . To understand women’s health and longevity, we need more— 100+ . Why? Women age differently. Hormones shift. Metabolism changes. Bone loss accelerates. Autoimmune risk rises. Nutrient reserves deplete. Yet most lab panels haven’t caught up. The conventional medical system I trained in (at Columbia and Mount Sinai) was reactive. I was taught to “wait until the wheels fall off” before testing and warned that “over-testing” was the problem. Meanwhile: Heart disease, dementia, diabetes, even cancer are often detectable years before symptoms show up 90% of people don’t receive essential preventive testing Proactive testing saves money (and lives) When I started Parsley Health 9 years ago, we flipped that script and created the comprehensive lab testing panel— with over 100 biomarkers —that you now see others offering. After 50,000+ patients and hundreds of thousands of labs (80% from women) , here’s what we’ve learned—and how to apply it to your own health strategy. 🤓 What to know: Female longevity depends on testing smarter. Standard labs often miss or under-test the systems that matter most to women’s long-term health. 🌀 Hormonal balance → Hormonal imbalances contribute to PCOS, infertility, perimenopause symptoms, and bone loss. Standard panels: rarely test hormones unless you’re TTC. Comprehensive testing: maps your full hormonal rhythm (including estradiol, progesterone, DHEA, testosterone, LH, FSH) and cycle health. 🦋Thyroid health → Women are 5–8x more likely to develop thyroid disease—especially around pregnancy or menopause. Standard: TSH only. Comprehensive: Full thyroid panel (includes Free T3, T4, Reverse T3, TPO antibodies—not just TSH) to catch subclinical shifts. 🔥 Gut inflammation + sensitivities → 70% of the immune system lives in the gut. Imbalances here drive bloating, fatigue, mood swings, and even autoimmunity. Standard: Not tested. Comprehensive: Checks calprotectin, zonulin, food antibodies, and more. 🛡️Autoimmune markers → Women are 3x more likely to develop autoimmune conditions, often triggered by hormonal changes. Standard: Only tests after major symptoms appear. Comprehensive: Includes ANA, CRP, ESR to catch immune activation early. 🍩 Blood sugar & metabolic flexibility → Metabolic syndrome affects 40% of women (and over half of women 60+). Standard: Fasting glucose and A1C. Comprehensive: Adds fasting insulin, HOMA-IR, leptin, advanced lipids. 🌱 Nutrient status → 40–60% of women are low in vitamin D and 1 in 5 has iron deficiency. Standard: Vitamin D maybe; iron if you’re lucky. Comprehensive: Includes vitamin D, ferritin, magnesium, B12, folate. ❤️ Heart health → Heart disease is highly preventable yet it’s the #1 killer of women. Standard: Total cholesterol and LDL. Comprehensive: Adds ApoB, hs-CRP, lipoprotein(a), calcium score recs. ☣️ Toxins + heavy metals → Everyday exposures—like mercury, lead, plastics, and pesticides—can disrupt hormones and accelerate aging. Standard: Not tested. Comprehensive: Includes heavy metals, endocrine disruptors, detox support markers. Why “normal” isn’t optimal Today’s lab reference ranges are designed to catch disease, not optimize health. Here’s what that looks like in real life: Vitamin D Normal: Anything ≥30 ng/mL Optimal: Women feel and function best between 50–70 ng/mL , with stronger immunity, better mood, and more resilient bones. TSH (thyroid stimulating hormone) Normal: <4.5. Optimal: Many women start noticing fatigue, hair loss, weight shifts, or mood changes once TSH rises above 2.5 . Ferritin (iron storage) Normal: ≥12 µg/L keeps you out of anemia. Optimal: Most women need 40–100 µg/L to support steady energy, focus, and exercise recovery. 💪 What to do: Test 2x per year. Tracking for the sake of tracking is not the point. Your numbers should inform a personalized health care plan. Here’s how labs can translate into simple actions with major impacts: Thyroid off? → Replete iron, zinc, Vit D, selenium (and/or use targeted meds) to restore energy and metabolism. Sex hormones imbalanced? → Support with fiber + muscle-building, plus hormone therapy when appropriate to support perimenopause symptoms or fertility. Heart health risks? → Track ApoB every 6 months; add a calcium score around age 50 to catch earliest signs of disease. Prediabetes? → Fasting insulin reveals risk before A1C spikes; reverse an elevated A1C in as little as 90 days Nutrients low? → Correcting Vitamin D and magnesium (two of the most common female deficiencies) pays off big for mood, bones, and immunity. Toxins high? → Elevated mercury (often from fish) can drive fatigue and cognitive decline; catching it early means you can detox safely. ✨Now for my really exciting news! ✨ Starting this week, Parsley Longevity Labs are officially available nation-wide to everyone! Each test comes with clear, personalized guidance from a Parsley clinician (we’re the only service offering labs this detailed paired with actual patient care from board-certified providers), including your own Functional Health Score and Aging Velocity metrics (how fast you’re aging vs. your peers) so you know exactly where to focus. These labs are designed for women who: Want to feel strong in midlife Feel “off” but get told they’re “normal” Want to track progress + longevity Are navigating perimenopause, menopause, or fertility Want to prevent bone loss, heart disease, metabolic syndrome Want to feel in control of their health Want to be strong for years to come Our outcomes show 85% of patients improve or resolve symptoms within their first year. Let’s do this together 💪Use code TKTK for TK off your Parsley Longevity Labs. ⚡Quick Hits 🌬️ Air purifiers for better cardiovascular health Adding a HEPA air purifier to your bedroom or living room may help your heart. A new study found that using air filters at home cut indoor pollution nearly in half. That translated to a small but meaningful improvement for people with high blood pressure. Cleaner air, calmer body. My favorite purifier here ! 🍷Drinking just hit a 90-year low Alcohol-use is plummeting and women’s drinking dropped 11 points in one year , according to new data . Given alcohol is now linked to 100,000+ cancer cases annually, this isn’t just a trend—it’s a health revolution. Studies show people consistently underestimate their alcohol intake—I track mine with Whoop . 🧠 One workout, big brain boost Just one aerobic workout can give your brain a lift. In a new study , older adults saw a 42% jump in BDNF (a protein that supports memory and brain health) after a single exercise session. Motivation to move today! 💛 The Momgevity Files The other night, I was in my kids’ room doing bedtime with my 5- and 3-year-olds when my 8-year-old wandered in and, out of nowhere, said: “Mommy, when I’m really old, you’ll be gone.” He got quiet and sad. I told him that when he’s old and I’m no longer here physically, I’ll still be with him in spirit. That if he ever needed advice, because we know each other so well, he’d be able to imagine exactly what I’d say. My 5-year-old overheard and immediately started sobbing—it was clearly her first realization that Mommy and Daddy won’t live forever. My 3-year-old didn’t quite understand, but came over anyway. Suddenly all of us were crying and hugging in a little pile of love. I reassured them that Mommy isn’t going anywhere for a very long time and that I’m working hard to live as long and as healthfully as possible. It’s easy to poke fun at the “longevity movement”—biohackers chasing 150 years, endless supplements, mountains of gadgets and experimental protocols. But for me (and for so many women I know), longevity isn’t about proving we can hit some big number. It’s about something deeper and more heart-centered: wanting to be here for our kids. Behavioral science shows that finding your why is the most powerful motivator for change. For me, it’s clear: I want to be around to enjoy my life with my children for as long as possible. And when you reframe longevity that way, the routines, the investments, the so-called “obsessions” don’t feel ridiculous. They feel essential. Stay strong, stay curious, and breathe, Robin Keep Reading My personal lab test results—and what I’m doing about it… Your comprehensive preventative health checklist. 4 fasting for women strategies to optimize longevity. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## VO₂ max: If you only track one number for healthspan, make it this one
URL: https://www.robinberzinmd.com/if-you-only-track-one-fitness-metric-make-it-vo2-max/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: VO₂ max—the maximum amount of oxygen your body can use during exercise—is one of the strongest predictors of how long (and well) you’ll live.
PT: Plus, fiber soda and the cancer-related reason for marinating meat. Robin’s Short Version Stronger Than Vitals: VO₂ max predicts lifespan more reliably than blood pressure, cholesterol, or diabetes risk. Small Gains, Big Impact: Raising VO₂ max by just 3.5 mL/kg/min cuts premature death risk by 11–17%, per a 2024 study. The 4×4 Protocol: Four 4-minute HIIT intervals with 3-minute recovery periods can boost VO₂ max by ~7% in just 8 weeks. VO₂ max—the maximum amount of oxygen your body can use during exercise—is the gold standard for cardiorespiratory fitness , and one of the strongest predictors of how long (and well) you’ll live. Boosting your VO₂ max by just 3.5 mL/kg/min slashes your risk of premature death by 11–17% ( British Journal of Sports Medicine , 2024). Because so many of you ask how to measure meaningful change—not just chase vanity metrics—I’m kicking off a new series: ✨ Measuring Longevity ✨ We’ll unpack which numbers actually matter for aging well (and which don’t), from biological age tests to body composition. First up: VO₂ max. Here’s why it matters so much, and how to track and improve yours. 🤓 What to know: VO 2 max is a top predictor of lifespan. VO₂ max is one of the strongest predictors of lifespan we have—more predictive than high blood pressure, cholesterol, or even diabetes risk. So, what exactly is it? 🏃VO₂ max = your body’s engine. It measures how efficiently your body uses oxygen during exercise—aka how well your cardiovascular, pulmonary, and mitochondrial systems work under stress. ⏳ Age matters. VO₂ max naturally declines ~10% per decade after age 25, and ~15% per decade after age 50 ( PLOS One , 2016). 💪 But exercise > age. Cardio, strength training, and HIIT can dramatically slow, or even reverse, VO₂ max decline. ♀️ There’s a gender gap. Women generally have 25-30% lower VO₂ max scores than men ( Journal of Clinical & Diagnostic Research , 2016). That’s partly due to body size and hemoglobin levels—not effort or fitness. 📈 It’s trackable. VO₂ max testing used to require a lab, treadmill, and oxygen mask. Now, wearables are becoming increasingly accurate. WHOOP gives the most accurate estimate within 8% of gold standard treadmill testing. (You can also manually input your VO 2 max from a treadmill test.) 💪What to do: Make VO 2 max your #1 fitness metric. I see a lot of people either: Shy away from health data completely, or Get overwhelmed by all the numbers wearables provide, then freeze. Start here. VO₂ max isn’t just a vanity metric. It drives real improvements in other important health indicators: Lower resting heart rate Better heart rate variability Improved metabolic efficiency Higher baseline calorie burn And remember: what you don’t measure, you can’t manage. ⌚Start with the gold standard graded exercise test, if you can. The most accurate way to measure VO₂ max is a graded exercise test : treadmill or bike + oxygen mask that measures your O₂ in and CO₂ out. If you have access to this test, aim to do it every 2–4 years . In between? Use a high-quality wearable like WHOOP to track trends over time. It won’t be perfect, but it’s directionally useful (expect ~10% margin of error). 🏃‍♀️ Train across three zones To actually improve VO₂ max, you need the right mix of exercise: Zone 2 cardio (low-intensity, steady state) Builds aerobic capacity, stroke volume (heart’s power per pump), capillary density, and mitochondrial health. Think fast walking, light cycling, or easy jogging, where you can talk but not sing. Aim for 3–5 sessions/week , 30–60 mins each. HIIT (high-intensity intervals) Short bursts at 90–95% of max heart rate, followed by recovery. Classic 4×4 protocol: four 4-min intervals, with 3-min active rest, repeated 4 times. Can improve VO₂ max by ~7% in just 8 weeks ( Medicine and Science in Sports and Exercise , 2007). Strength training Helps preserve muscle mass, which increases oxygen uptake and supports long-term VO₂ max gains. Strength training becomes more important with age ( European Review of Aging and Physical Activity , 2013). 🧘 Don’t forget recovery, sleep, and food VO₂ max isn’t just about exercise. Your recovery habits matter, too. Poor sleep = lower HRV, higher cortisol, impaired glucose tolerance Chronic stress = reduced mitochondrial efficiency + more oxidative damage Adequate protein and omega-3s = support mitochondrial repair and muscle synthesis 🏅The higher your VO 2 max, the better. The “average” VO₂ max for your age is a baseline , not a goal. Train toward the optimal VO₂ max for someone 10 years younger. Suggested minimum targets: Women 40–49: 46 Women 50–59: 42 Men 40–49: 56 Men 50–59: 51 Use these numbers as a training benchmark—not a ceiling. ⚡Quick Hits 🧠 Microplastics increase Alzheimer’s risk Mice exposed to high doses of microplastics in their drinking water developed Alzheimer’s-like symptoms. Human impact is still unclear—but if you have elevated genetic risk, this is one to watch. Read my detailed microplastics detox protocol . 🥩 Marinating meat cuts cancer risk I recently learned that marinating beef, chicken, or fish for just one hour before cooking may lower carcinogen levels by as much as 88%. Add a simple marinade (like olive oil, citrus, herbs, or vinegar) before grilling or roasting to make your meals healthier and reduce carcinogenic risk. 🍫 Fiber soda ≠ gut health WSJ just reported on fiber sodas and the new wave of fiber-fortified ultra-processed foods hoping to cash in on the fibermaxxing trend. Most use just one fiber: inulin. In excess, it can cause bloating and distortions in the microbiome. Instead: aim for 30-50 grams of fiber from whole foods like fruits, veg, nuts, seeds, and whole grains for diverse fiber types, microbiome balance, and max health benefit. 💛 The Momgevity Files Last week, I went to Burning Man. I know. For many, that’s a bit cringe. But before you close the tab, hear me out 👀 This dust-filled desert event has become, unexpectedly, a peak longevity reset for me—a muddy, beautiful mix of community, nature, play, and movement. And I keep going back not for the EDM or outfits (still working on those 😅), but because it gives me something I’ve never gotten from a wellness retreat or spa weekend. I’d heard about Burning Man for years (mainly from my startup-world friends) but it always felt out of reach. For seven straight years, I was deep in the cycle of pregnancy, breastfeeding, and toddler life. Adventure wasn’t exactly on the menu. Then, right as my youngest was turning two, a friend invited me—and more importantly, handled all the logistics. (Bless them.) That was three years ago. What I thought would be a one-time leap out of my comfort zone has turned into an annual pilgrimage. Not because I love house music or fishnets (strong no on both), but because it delivers 5 health essentials in one week that I spend a lot of time in the rest of my life seeking. 1. Digital Detox Even with Starlink enabling spotty wifi here and there, most of the time, my phone stays buried in my backpack. I’m more unplugged than I am on any vacation—no emails, Instagram or calendaring. This kind of digital silence is rare, and it rewires something in me. The result is I feel more mentally clear than any other time of year. 2. Community Building and running a camp taps into an experience most of us haven’t had since we were kids: Building with your hands with a shared purpose. Think adult summer camp—hauling gear, setting up shelter, solving problems together on the fly. It’s sweaty, hilarious, sometimes frustrating, and deeply bonding. 3. Unstructured Play We explore. Dance. Bike aimlessly. Visit giant sculptures. Dress up. No agenda. No productivity tracker. Just play. And yes, it’s actually good for you. Play increases creativity, resilience, and brain plasticity. Adults need recess too. 4. Functional Movement My daily stats double out there. 🚶‍♀️Steps: 15K+ (vs 7-8K at home) 🔥Calories burned: 2,500+ (vs 1300 at home) 🪑Time sitting: almost none (vs 8+ hours at home) And none of it feels like a chore. It feels like life . 5. Nature The Nevada desert is absolutely beautiful. You wake with the sun, fall asleep under a sea of stars, and spend all day battling (and surrendering to) the elements: wind, sun, mud, rain, cold, dust storms. I’m not naturally very outdoorsy, but every year I feel stronger for having survived it. I sleep like a rock in my cold little shift pod. I am in awe of the sunsets. And I come back feeling connected to my body. As a mom, taking six days away from my family can feel wildly indulgent. But in reality I’m not taking anything away. It’s giving me back to myself—my energy, my creativity, my clarity. And that is what I bring home to my work, my kids, and the season ahead. Sometimes what you get is what you give. And this one week? It’s me giving to myself. Stay strong, stay curious, and breathe, Robin Keep Reading How Much Does Vigorous Exercise Really Matter? Forget Weight—Muscle Mass Is the Real Longevity Metric. If You Only Fix One Thing for Longevity, Make It Your Mitochondria. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## ChatGPT gave my patient the wrong prescription—here’s what it got right.
URL: https://www.robinberzinmd.com/how-to-use-chatgpt-for-medical-advice/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: AI is going to transform medicine. So let’s talk about how to actually use ChatGPT for health and what to avoid.
Plus, magnesium for hormones and 7k steps for longevity. Robin’s Short Version Accuracy Has Limits: ChatGPT scores 72% overall but drops to 60% for differential diagnoses—too low for complex personal care. Prompts Have Blind Spots: Without medical training, you may omit inflammation markers or family history that completely change the right treatment plan. Privacy Is at Risk: Pasting lab results into ChatGPT isn’t HIPAA-compliant—use a secure patient portal for any sensitive health data. 1 in 5 people regularly use ChatGPT for health advice. But 1 in 5 of those people also end up following advice that turns out to be wrong, according to data from Cornell . As AI explodes into healthcare, it’s tempting to use it like a free, 24/7 doctor. And in some ways? You should. AI is going to transform medicine. At Parsley Health, we’re already using AI behind the scenes to improve accuracy and efficiency for members. I even use it to pressure-test my thinking and clarify complex data for patients. But as your friendly MD, I want you to use it wisely—not blindly. So let’s talk about how to actually use AI for health , what to avoid, and why your prompt matters more than you think. 🤓 What to know: The advice might be correct—but not right for you. ChatGPT is fairly accurate—here’s how it performed in a recent study using clinical vignettes ( Journal of Medical Internet Research , 2023): 72% overall accuracy 77% for final diagnoses 68% for clinical management 60% for differential diagnoses Pretty good, but not good enough for complex or deeply personal care. Case in point: One of my longtime patients recently showed up to a Zoom visit with a full AI-generated treatment plan. He’d uploaded his labs and health goals and asked ChatGPT for “alternatives to statins.” He got exactly what he asked for: two second-line drugs, plus plan for nutrition, supplements, exercise, much of which we were already doing. On paper, the answer was technically “correct.” But it missed the point. It didn’t address why he was resistant to statins in the first place, or which alternative might actually move the needle on his cholesterol based on his history, inflammation markers, and family risk. AI is only as good as your prompt. And if you’re not a doctor, you might not know what you’re leaving out. 🚨 5 reasons to be cautious with AI health advice ▶️ Inputs matter Without medical training, it’s easy to leave out key details—like allergies, medications, family history, or subtle lab markers. That missing context can drastically alter your care plan. What sounds like solid advice may be based on an incomplete picture. 🔮 Hallucinations happen ChatGPT and other LLMs occasionally “hallucinate” fake studies, citations, and treatment protocols. These outputs often sound authoritative, but they’re not grounded in real evidence. I catch these regularly when I fact-check content. Always verify citations. 🌎 Context is everything Even great answers can be wrong if they don’t apply to your body, history, and lifestyle. AI can’t intuit your underlying issues or recognize that your insomnia is tied to perimenopause and not just stress or screen time. That kind of nuance still needs a human. 🔒 Privacy isn’t guaranteed Pasting your lab results or health history into ChatGPT might feel harmless but it’s not HIPAA-compliant. You don’t know where that data goes or who can access it. Use secure patient portals (like Parsley’s or your hospital’s) for anything sensitive. 🕵️ Efficiency ≠ expertise AI is amazing at summarizing, organizing, and brainstorming. But it lacks real-world clinical judgment. It doesn’t yet know when a symptom combo means “watch and wait” or “go to the ER now.” 💪 What to do: 5 ways to use AI to make you a smarter patient. At its best, AI can empower you to take ownership of your health, organize messy health information, and answer quick questions to help you avoid that unnecessary trip to urgent care. ✅ DO use AI to… 🔬 Understand your lab results. If your doctor rushed through your CBC or thyroid panel, AI can help decode what those numbers mean and flag what you should follow up on. 🩺 Triage sudden symptoms. Wondering if that chest rash needs urgent care? Or if your toddler’s fever can wait till Monday? ChatGPT can help you think through next steps (not replace clinical care). 🧾 Prep for appointments. Bring your best self to the doctor’s office: AI can help you list symptoms clearly, prepare smart questions, and suggest treatments to ask about. 💊 Organize your supplement routine. Overwhelmed by your growing vitamin shelf? AI can help create a simple schedule and check for possible interactions (though it’s not a replacement for pharmacist-level oversight). 🧷 Solve random low-level issues. I recently cracked a nail half way down the nail bed—I had no idea if nail glue was safe or useful (not a manicure girl). AI helped me triage and recommended the right products to help it heal. ❌ DON’T rely on AI to… 🚫 Diagnose chronic or complex health issues. AI isn’t trained to detect patterns across years of symptoms or pick up on subtle emotional or hormonal cues that change the clinical picture. If your symptoms are vague, weird, or long-term, start with a real provider. 🚫 Prescribe meds or supplements. Asking AI for treatment advice might give you something plausible but not necessarily safe. A UTI could seem benign enough to ask Chat about, for example, but if you don’t know to ask about warning signs for kidney infection, it might suggest something that delays critical care. This is an example of right answer, wrong prompt. 🚫 Source “natural” remedies. AI scrapes the entire internet—which includes plenty of sketchy advice. Like the patient who got “dandelion tea for a UTI.” Not effective. 🚫 Be your therapist. Yes, it’s conversational. Yes, it can echo therapy terms. But it’s not trauma-informed, can’t assess risk, and has already been linked to some users spiraling emotionally. Mental health is real medicine that requires support from someone trained to guide you. 🚫 Upload or store health information you want to keep private. Freemium LLMs aren’t secure vaults. If there’s no privacy policy, assume your info is not private. ⚡Quick Hits 🚶‍♀️ 7,000 steps = major health boost Forget 10K: a new Lancet study found that just 7,000 steps/day cuts risk of death by 47%, heart disease by 25%, dementia by 38%, and depressive symptoms by 22% If you’re not already there, three brisk 10-minute walks should easily get you to 7K. 🧠 Artificial sweeteners = faster brain aging Heavy use of sweeteners like aspartame, saccharin, and erythritol was linked to a 62% faster decline in memory and thinking skills—equal to 1.6 extra years of brain aging. If you want some sweetness, add honey, which is rich in polyphenols that help reduce oxidative stress. 🌕 Preload your magnesium for PMS Cramping? Mood swings? Magnesium helps relax muscles, ease cramps, stabilize mood, and improve sleep quality—all of which tank in the luteal phase. Take 400mg of magnesium glycinate at night in the 5 days leading up to your period to blunt symptoms. 💛 The Momgevity Files This week I took on a really exciting new collab (can’t wait to share more soon!) that had me on a 5 a.m. flight to Boston and back the same day. I landed at 10:30 p.m. and was up again at 6:30 the next morning with the kids. “I am a SHEro!” I thought as I rolled out of bed. By 10 a.m., I was an emotional and energetic wreck. I could have stayed at a hotel overnight and prioritized sleep. But I didn’t want to miss two precious bedtimes and two school drop-offs. So there I was: bleary-eyed, sipping a rare second espresso, wondering if it really would’ve been so bad to be gone for two days instead of one. But as we got ready for school, the kids begged me not to go away again anytime soon. That was hard to hear—especially with at least four short trips already on the calendar this fall. My five-year-old even announced she’s coming with me next time. (Honestly, I’d love to have her join me at Eudamonia in West Palm Beach this November. She’s my BFF and would love geeking out in consumer wellness Disneyland.) With their “feedback” in mind, I tried to do some life math this week. Here’s how Fall ’25 is shaping up in terms of energy demand on my body, mind, and soul: Career demands = 11/10 Kids’ needs = 9/10 Social life = 10/10 Space for my marriage = 5/10 ( still trying to plan that weekend away… ) Time for myself = basically zero I love what I do—and it’s a privilege to get to do so much of it—but lately, I’ve felt like I’m doing a really bad job at maintaining my own energy balance. One of my mom friends texted last week: “Life is eating me alive right now.” Honestly? Same. As I write this, I’m debating skipping a big event I’d committed to tonight. I’m thinking of going to yoga instead and being home to tuck the kids in. It feels hard to say no, and even harder to prioritize my wellbeing. (If I skip the event, should I let the sitter go?!!) But here’s the truth: I need to make more time for things in the non-productivity bucket. Like a rare 6 p.m. yoga class that restores my lifeforce instead of draining it. At 44, I don’t want to live tired. Longevity, for me, isn’t about making it to 150—it’s about having the energy to fully live my story for decades to come. It’s not just the highlight reel on social media—the photo shoots, big work wins, parties, and travel. It’s also the rest. The downtime. The quiet. Those moments are the highlights of the story too. Stay strong, stay curious, and breathe, Robin Keep Reading 100 Essential Labs Every Woman Should Be Tracking Your comprehensive preventative health checklist. Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Chronological vs. Biological Age: Which One Really Matters?
URL: https://www.robinberzinmd.com/how-to-lower-biological-age/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Biological age predicts disease risk, functional health, and even mortality better than your chronological age. Here’s how to lower yours.
Plus, gel manicures and mushrooms vs. microplastics. Robin’s Short Version No Single Number: Biological age can vary by 17+ years depending on the method—DNA, bloodwork, and wearables each capture a different dimension of how fast you’re aging. The Cardio Tax: Skipping Zone 2 exercise can add nearly 2 years to your biological age, even when your bloodwork looks perfect and your diet is optimal. Testing Rhythm: Run blood labs twice a year, use a wearable daily, and do DNA methylation testing every 1–2 years to track trends over time. Right now, I have 4 different ages. Chronologically, I’m 44. But my biological age —how old my cells, tissues, and systems really are—depends on who you ask. 🕜 WHOOP says I’m 46 (based on VO₂ max, time spent in Zone 2, resting heart rate, and sleep consistency). 🕜 Parsley Longevity Labs puts me at 29 (blood biomarkers). 🕜 Tally Health clocks me at 42 (DNA methylation). Heading into my mid-40s, I care less about candles on a cake than how old my body really is. Why? Because biological age predicts disease risk, functional health, and even mortality better than your chronological age ( Nature Scientific Reports , 2021). So which measure is “right”? None of them in isolation. Each gives a different piece of the puzzle. That’s why we’re diving into ✨ Measuring Longevity, Part II ✨: how biological age is measured, what these numbers really mean, and—most importantly—what you can do to lower yours. 🤓 What to know: DNA tests are the gold standard—but labs and fitness add critical context. Biological age isn’t one number. It’s a multi-layered snapshot of how fast your body is aging, through three main lenses: 🧬 DNA Methylation (Epigenetic Clocks) These are the “gold standard” tests. They track chemical tags on your DNA that change with stress, lifestyle, and disease. Best for: cellular-level aging Pros: Powerful, data-driven Cons: Expensive (~$300+), takes 6+ weeks 🩸 Lab Tests (Phenotypic Age) Calculated from fasting labs: glucose, insulin, hsCRP, liver/kidney function, etc. Algorithms compare your markers to large datasets. Best for: spotting metabolic + inflammatory issues Pros: Affordable, actionable, repeatable Cons: Can miss subtle DNA-level changes 💪 Wearables (Fitness & Physiological Markers) Tracks VO₂ max, HR variability, sleep quality, strength, recovery which indicate how well your body’s working in real time. Best for: daily feedback + behavior change Pros: Continuous data, instant feedback Cons: Less precise for long-term aging 🧪 What My Numbers Say Here’s what my own metrics are showing me: ✅ I have the bloodwork of a 20-something. I eat incredibly well, maintain a healthy weight, and I don’t have any signs of autoimmune, metabolic or heart disease (i.e. the conditions that destroy healthspan for most Americans). ⚠️ But my fitness habits are dragging me down. I walk a lot (thanks NYC!), do 30 minutes of weights 1-2 times a week, plus a weekly pilates session and a yoga class. But the reality is I spend most of my day sitting on my very flat bum and my heart rate rarely gets out of Zone 1. WHOOP says that’s adding nearly 2 years to my bio age. 😴 Sleep inconsistency is costing me too. I average 7.5 hours, but the timing is all over the place (hi, kids + social life). That’s half a year added, per WHOOP. 💥 My epigenetic age is lower . This is mostly thanks to nutrition, supplements, and low inflammation. But exercise matters here too. Sedentariness and stress affect DNA methylation ( Journal of Applied Physiology , 2023). Want to start measuring? Here’s my simple rhythm: Blood labs : 2×/year (4x if managing a chronic condition) Wearables : Daily feedback on HR, sleep, movement DNA methylation : Every 1–2 years for trend tracking ⚠️ Remember: These are trend markers, not gospel. If your biological age says 26 but you feel like garbage, something’s up. That’s where functional care matters— tests should guide, not override, how you feel. 💪What to do: Sleeping, eating, and training can lower your bio age by years in just months. Here’s the exciting part: your biological age is changeable. Studies show you can lower it by 4 years in just 1 month . Sleep, food, movement, and stress will move the needle the most. Sleep 7+ hours and stay consistent Poor sleep (insomnia, apnea, inconsistency) raises inflammation and impairs DNA repair, accelerating epigenetic aging ( Clinical Epigenetics , 2024). 🛌 7+ hours nightly and consistent bed/wake times. Eat and supplement to lower inflammation Anti-inflammatory diets (Mediterranean, DASH) slow biological aging ( Nutrition Journal , 2024). 🍽️ Aim for: 0.7 g protein per lb body weight (I supplement with a high quality protein ) 30–50 g fiber <25 g total sugars 💊 Evidence-backed supplements: omega-3s, probiotics, methylated B-vitamins, zinc, and vitamins C, D, E (antioxidants). Cardio + HIIT Exercise reprograms DNA methylation: boosting mitochondria, reducing inflammation, and repairing tissue ( Aging , 2025). 🏃Sustained cardio and HIIT are the most impactful exercises for bio age ( European Heart Journal , 2018). 💦 Just 1 month of HIIT training (3x per week, 20 minute sessions) can reduce bio age by almost 4 years ( Aging Cell , 2023). 15 minutes of meditation Chronic stress accelerates biological aging by dysregulating methylation ( Psychoneuroendocrinology , 2018). 🧘 Meditate for 15 min every day to balance cortisol and trigger parasympathetic balance. Cut exposure to PFAS (and other toxins) Toxins & metabolic dysregulation accelerate aging via inflammation, glycation, mitochondrial damage. 🌱 Easy wins: Skip BPA-lined cans and plastic bottles Avoid fish high in mercury Watch for PFAS in food packaging Limit alcohol, smoking, and processed foods ⚡ Quick Hits 💅 Gel polish ban incoming? The EU just banned TPO, the ingredient that makes gel polish harden due to fertility concerns (in animal studies). Feeling vindicated that I haven’t gotten my nails painted since I first found out I was pregnant 9 years ago! I go for a natural buff nail. One less toxin exposure to worry about. 🧪 Creatine for menopause brain fog In one 8-week trial , creatine improved memory, cholesterol, and mood in peri/postmenopausal women. I take 5g of Parsley creatine daily. 🍄 Mushrooms vs. microplastics A type of fiber called β-glucan (found in oats and mushrooms) reduced PFAS levels in mice exposed to high doses of the forever chemicals by disrupting their recirculation in the gut. Another reason to lean into hen of the woods season to meet your fiber goals. 💛 The Momgevity Files My youngest son—my baby—turned four this week. Four feels like a turning point between babyhood and true kiddom. He’s officially in pre-K at his Montessori and starting to look like a little man—even if we’re still in pull-ups at night and working through thumb-sucking. As he grows up, I feel myself shifting too. At 44, I feel healthier and more vibrant than ever, but this milestone has stirred up some major waves of emotion. I see strollers and baby carriers and feel almost shocked that those days are behind me. As exhausting as those early years were, they were also magical. I never thought I’d be the nostalgic mommy type, but lately I find myself having wild thoughts like: I could totally have another! Maybe I’ll adopt! Logically, I know three kids is all I can handle. I already feel stretched way too thin—there’s truly no more of me to go around. So what’s up with all the baby cravings? We live through such a unique arc as women: we spend early adulthood doing everything we can to not get pregnant, then we work so hard to get pregnant, then we find ourselves in the expansive—but disorienting—new mom years: grappling with a shifting identity and a changing body, while reveling in the excitement that comes with each new child. Each birth feels like opening a brand-new chapter— the biggest of big beginnings. So naturally, in some ways, their growing up also feels like an ending. And when I add in the fact that I’m staring down 45 next year—a number that feels like a true midpoint in the fulcrum of life—well, the emotions get even bigger. There are so many positives to this moment too: kids who are more independent, less of a hazard to themselves, and ready for new kinds of family adventures. I’ve heard people say that when your youngest turns five, life “unlocks” in a whole new way—especially for your marriage. I can already feel it coming. Sometimes the truth is that all the focus on muscle mass, brain health, metabolism and bones is a way to avoid looking at the passage of time. Which is why in these watershed moments, while it’s hard, I think it’s important to look at time in the face and hold it close, slowing it down and appreciating every second. That is longevity too. Stay calm, stay curious, and breathe, Robin Keep Reading VO₂ max: If you only track one number for healthspan, make it this one If You Only Fix One Thing for Longevity, Make It Your Mitochondria. What a CGM Can Tell You About Your Aging Velocity Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## 5 Preventative Tests No One Over 30 Should Skip
URL: https://www.robinberzinmd.com/5-preventative-tests-no-one-over-30-should-skip/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: If the system isn’t coming to save us — and it’s not — you have two choices: be the worried well, or be the worried sick. Here’s why I chose proactive a
Plus, my thoughts on Tylenol and Autism. Robin’s Short Version Labs Leave Gaps: Standard panels test only ~19 biomarkers; a functional longevity panel covers 100+, including ApoB, Lp(a), and fasting insulin. Colon Cancer Is Younger: Rates are rising fastest in adults under 50—screen before 45 if you have family history, smoke, or eat a diet high in ultra-processed foods. Bone Loss Starts Early: Women can lose up to 20% of bone mass in their 40s and 50s, making early DEXA scanning critical for protecting muscle and bone health. Are you one of the worried well ? Or a wellness warrior? Depends on who you ask. My friend Chrissy Farr—healthcare journalist, investor, and author of Second Opinion —recently interviewed me about why we should retire the term “worried well.” I agreed at first, but the more I’ve thought about it, the more I think we should embrace it. If the system isn’t coming to save us (and it’s not), you’re either the worried well —or the worried sick . I was reminded of this last week when I cried after a patient visit. I’ve known this woman for years. She came to Parsley Health to get ahead of midlife shifts—weight gain, hormone changes, and a family history of high cholesterol. She’s my favorite kind of patient: proactive, curious, and committed to the idea that more data means more power over her health. Two years ago, a full-body MRI picked up early-stage lung cancer. Surgery went well, and her oncology team declared her cancer-free. Most would stop there. She didn’t. She kept digging, working with an oncology clinic in Mexico for cutting edge treatments and proactive tracking of cancer markers that aren’t part of standard U.S. care. When they rose, she pushed for a PET scan. It confirmed: the cancer had returned. She’s now Stage 4. Next? She’s flying to Europe for an experimental, genetically tailored cancer vaccine. Her doctors at Columbia praised her (and told her they’d risk losing their licenses if they tried the same treatment here). Stories like hers underscore a brutal truth: For proactive and preventive care—especially in diseases without clear answers—you’re often on your own. That’s why I’m so excited to share today’s guest “What to Know” from Chrissy as a reminder that being proactive about your health is a badge of honor. First, the 5 things I recommend every woman 30+ consider this month to be a worried well warrior. 💪What to do: Drive your own preventive health journey. Starting now. There’s no shame in being proactive about your health. Start here. ✅ Full body MRI. My last MRI found a benign kidney tumor and a thyroid nodule. Here’s how I’m using that data to inform my care . Book a full-body screening every 1-2 years. Prenuvo is the option I trust—and a new Parsley Health partner. ✅ Preventative functional longevity labs. Standard labs test ~19 biomarkers; Parsley’s longevity labs look at 100+ including: ApoB + Lp(a) for advanced cardiovascular risk Full thyroid and hormone mapping Fasting insulin and nutrient levels Autoimmune markers ✅ Cologuard or early colonoscopy. Colon cancer is rising fastest in adults under 50. Non-invasive stool DNA tests (like Cologuard) can flag early changes. If you have family history, or risk factors (smoking, diet high in UPFs) screen earlier than 45. Colonoscopy remains the gold standard. Cologuard (costs $650) is a great out-of-pocket option. I did my first one at 42. ✅ Full body dexa scan. Key for women 30+ : you lose up to 20% of bone mass in your 40s and 50s. Tracking body comp helps you protect muscle and bone—two of the strongest predictors of healthy aging. ✅ Genetic testing. One cheek swab = major insight. Two examples I recommend: APOE: Tied to Alzheimer’s risk; helps personalize prevention (exercise, sleep, hormones). MTHFR: Affects folate metabolism and detox pathways; can guide supplements and impact mental health. 🤓What to know: The “worried well” is a badge of honor. 💌 Here’s an excerpt of Chrissy’s recent newsletter on the shaming of the “worried well.” Subscribe to Second Opinion to read the full deep-dive. Let’s banish the term “worried well” If anyone should fall into the category of a “worried well” person, it is probably me. I don’t have any chronic conditions, I take zero medications, and I’ve maintained a normal body mass index (BMI) for as long as I can remember. For those not familiar, “ worried well” has been used in our industry by journalists, doctors, and companies to refer to people who are healthy but extremely anxious. These people are also sometimes described as “quantified selfers,” because of the attention they pay to their healthcare information, whether it be from medical tests, scans, or wearables. I used to be ashamed to be a member of this so-called “worried well” community. But I’ve changed my tune on it. Some level of anxiety about health is actually a good thing. Where I’ve channeled that worry about the future state of my health into curiosity, and ultimately into action, I’ve improved my lifestyle and learned about diagnoses I didn’t even know I had. One recent example through this journey I’ve been on – I learned I have a condition called PCOS, and specifically the far less common “ lean ” kind, which is a hormonal disorder that impacts women. About 1 in 10 women have PCOS, and it’s just one of a long list of conditions that affect women that are also underdiagnosed. Information is power. I’m by no means a techno-optimist who believes that more data will solve all the problems in healthcare. But I also don’t believe the system today is set-up to support patients who want to stay healthy for as long as possible. Patients fall through the cracks all the time , and yet those who choose to advocate for themselves are often labeled as difficult or annoying. As I’ve spoken with physician friends, a new reality has emerged that there’s in fact a significant swath of patients who are extremely sick and under-engaged; a tiny swath of highly vocal patients that are far too engaged; and a bunch in the murky middle. These individuals in the middle want answers and they would opt into prevention if they could, but they feel that their doctors don’t have time for them or they’re afraid of the expense. To put a finer point on it, the patients are not the problem. The system is. And we should stop using language like “worried well” that demonizes the patient who is fighting an uphill battle largely on their own to stay healthy and ultimately bend the cost curve. When that happens, we all win. “The conventional medical system is strapped for time, prevention isn’t reimbursed, and often doctors aren’t trained to answer your questions when it comes to being proactive about your health, my friend Dr. Robin Berzin, who’s also the CEO of a functional medicine company called Parsley Health, shared by phone. “As a result, you feel dismissed. “Doctors will think about the immediate problem, we’re trained in the chief complaint,” added Robert Green, a physician scientist and medical geneticist. “In an outpatient ambulatory setting where literally – and my wife is a primary care – you’re under ridiculous pressure to see patients every 10 to 15 minutes, that is a pressure cooker. The incentives are poorly aligned.” Dr. Berzin made the point that there’s very few people who are genuinely so healthy they can’t benefit from some amount of time and attention to discuss their health. There aren’t that many people who are so “well” that any amount of concern for their health is a bad thing, particularly when you consider that more than 70% of American adults are overweight or obese, and 60% live with at least one chronic disease. “We have a sick population and yet the medical community is resistant to people who want to do something about their illness,” she said. Some regrets… and a rebrand I’ll admit that I have used the term “worried well” in the past while working as a journalist. I now regret it. But my perspective has changed as I’ve gotten older, and I’ve watched friends grapple with cancer diagnoses, chronic illnesses, long and traumatizing experiences related to infertility. I’ve changed my tune to encourage the people in my life to get into their front seat when it comes to their own health. Life is too important and too short to not care about health, and invest in it accordingly. But I am also a firm believer in the idea that having a trusted, trained medical professional in the loop should be part of the process. ChatGPT can be a super helpful tool, and that hour I spent with the physician asking questions was where I got most of the value from the Prenuvo experience. Unfortunately, that often means expensive concierge medicine that’s not affordable for most people, although there might be rare cases out there where it’s possible with a family GP (those doctors are often working in their personal time to cater to patients in a system that rewards them for maximizing panel sizes). So I’m proposing we ditch the term “worried well” and instead refer to people who want to engage in prevention in a far more positive way? I don’t yet have a catchy marketing-friendly term, but I love words like “vigilant” and “proactive.” I’m all ears if anyone out there has an alternative. Again, the system we have doesn’t make any of this easy. It is actually hard to stay healthy in America because of the lack of healthy food and so many other factors. It takes steady practice and constant attention. Dr. Berzin gives the example a lot in her own writing of ACOG recommending that women get bone density scans at 65. It’s her medical opinion that these should begin earlier and she’s now recommending women get DEXA scans younger . Bone density peaks at 28, she noted, and women lose about 20% of their bone mass in menopause. So there is no reason to wait. Mammograms are another good example. Many of the women I know who have been diagnosed with breast cancer didn’t find anything on a mammogram. A lot of them have dense breasts, and had to advocate for themselves to their doctors. There are countless examples like this where being vigilant pays off. “Let’s stop resisting the idea that the average person shouldn’t be in control of their own health,” said Dr. Berzin. “It’s a net good thing: good for society, good for the individual, and it bends the cost curve if patients stay healthy and avoid serious disease.” Subscribe and read Chrissy’s full take on the worried well at Second Opinion! 💛The Momgevity Files As you’ve probably heard, at a recent White House event, President Trump claimed that Tylenol use during pregnancy could cause autism—contradicting the FDA and oversimplifying a correlation researchers have been exploring for years. As a mom of a neurodivergent child—ADHD moms, I am you; autism moms, I feel you—this one hit deeply. I’ve spent two decades focused on how environmental factors—what researchers now call the exposome —impact our health. In 2012, the Mount Sinai Children’s Environmental Health Center was funded to study 12 common chemicals, including air pollution, mercury, and phthalates, that may be contributing to the rising rates of neurodivergence and neurological conditions in kids. Notably, Tylenol, PFAS, and microplastics weren’t on that list, but other substances like pesticides and flame retardants were. Before my first pregnancy in 2017, I was proactive: IV chelation to remove heavy metals, eating organic, switching to non-toxic makeup and personal care products, and testing my genetics. I learned I carry two copies of an MTHFR gene variant that impacts mental health and detoxification, so I switched to methylated folate prenatals. The day I got my first positive pregnancy test, I stopped getting my nails done to avoid unnecessary toxin exposure. I also avoided Tylenol during all three pregnancies except when absolutely necessary, based on an imperfect—but published—study showing a link between Tylenol use and childhood asthma. I would have taken it if I truly needed it, but avoided it because I could. Said simply: I did everything I knew how to do. And I still have a neurodivergent child. So this overly simplified idea that “Tylenol causes autism” is both harmful and dangerous. Autism and neurodivergence are not caused by one medication, or we would have figured it out by now. In my view, these conditions are multifactorial, likely shaped by: Genetics (the DNA we inherit) Epigenetics (how genes change in response to stress, diet, and toxins) Interactions with our in-utero environment (aka the exposome) The truth is: we don’t fully understand what causes neurodivergence. We’re searching for a needle in a haystack. Blaming a single drug or chemical won’t cut it. And it’s important to understand: high-quality research here is extremely difficult. We can’t ethically run randomized controlled trials on pregnant women. So the data we do have is observational and subject to things like recall bias and other confounding factors. So, what do we do? First: Give clear messaging. Some studies suggest a correlation between prenatal Tylenol use and autism. Others do not. There is no conclusive data, no proposed mechanism of action, and no consistent dose-response relationship. So we cannot say “Tylenol causes autism.” What am I telling my patients? I tell them: While there’s no conclusive evidence, because some studies raise concern, I recommend using Tylenol in pregnancy only when absolutely necessary, and always in partnership with your OB. This isn’t a blanket rejection, it’s just a cautious, honest approach based on what we currently know. Where do we go from here? We can’t bury our heads in the sand when it comes to environmental toxins, chemicals, and both prescription and over-the-counter drugs that may be contributing to neurodivergent conditions. What I was exposed to during pregnancy—or even during my own childhood, which may have affected my epigenetics—is not my fault. But I don’t want to pretend that these things aren’t potential issues. As a mother living in what often feels like a slow-motion crisis, I want us to dig deeper. I want us to question the chemicals we once assumed were safe—until we’re absolutely sure. I want us to do what Europe does: require companies to prove safety before products reach consumers, not after harm has occurred. I want institutions like Mount Sinai to get 100x more funding—and the FDA and NIH too. We need to fund our scientific community fully—and use AI to accelerate clarity. Because our children’s brains deserve more curiosity, more rigor, more funding, and more honesty than politics as usual. Stay strong, stay curious, and breathe, Robin P.S. See you back here next week for my next installment of ✨Measuring Longevity✨. Keep Reading 100 Essential Labs Every Woman Should Be Tracking Your comprehensive preventative health checklist. Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How Do You Actually Know Your Heart Is Healthy?
URL: https://www.robinberzinmd.com/how-do-you-actually-know-your-heart-is-healthy/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Let’s stop waiting to measure heart health until there’s already damage
Plus, HRT for Alzheimer’s and toxic mold. Robin’s Short Version Start at 25: ApoB, triglycerides, and metabolic markers should be tested decades before most doctors recommend. ApoB Over LDL: ApoB directly counts artery-clogging particles and is the #1 predictor of heart disease risk; keep it under 80. VO₂ Max Matters: A 3.5-point increase in VO₂ max cuts mortality risk by 11–17%; aim for the top 25% for your age and gender. Let’s stop waiting to measure heart health until there’s already damage. Heart disease is slow-moving, largely preventable, and in many cases, reversible. Yet it’s still the #1 killer of women—and nearly half of American adults have some form of cardiovascular disease ( Circulation , 2019). We should be ahead of this by now. Somehow, we’re not. Everyday inputs—stress, diet, movement—shape heart health in profound ways. But most of us aren’t testing the right markers, or we’re testing too late. The traditional medical system tends to intervene only after disease has taken hold. The smarter approach? Personalized, proactive medicine: test the right markers, track them over time, take action early. This is especially crucial for women. Even those who lift weights, eat protein, and get their fiber dialed in often still struggle with rising cholesterol. Important reminder: We need cholesterol—it’s the raw material for our sex hormones. But the goal is to get ApoB under 80 , the threshold that protects against future heart disease. This week, we’re breaking down what to measure, why it matters, and how to protect your heart for the long haul. 🤓 What to know: Start measuring heart health at 25. Yes, twenty-five . Heart health is measurable. When you catch changes early, it’s easier to prevent disease. Doctors often use the ASCVD risk score (age, cholesterol, diabetes, smoking) to decide if you need a statin. It’s a solid starting point but in practice, I find it can be overly reassuring. Here’s what I test instead: 🧪 Bloodwork: Start at 25 (or 35 if cost is a barrier) ApoB → Directly measures artery-clogging particles; the #1 predictor of heart disease risk. ⭐Goal: < 80 Lipoprotein(a) → A genetic cholesterol variant that doubles your risk if elevated ( Cardiovascular Diabetology , 2024). ⭐Goal: < 30 Triglycerides → Linked to atherosclerosis. ⭐Goal: < 90 Metabolic markers → Metabolic syndrome doubles the risk of heart disease. ⭐Optimal HbA1C: < 5.2; Optimal fasting glucose: 70-85 ; Optimal fasting insulin: 2-5 hs-CRP → A measure of vascular inflammation. ⭐ Goal: <1.0. Advanced Lipids (NMR) → Shows several measures including LDL particle size. ⭐ Small = damaging, large = less harmful. ⌚ Wearables & functional biometrics Resting heart rate → Persistent elevation can flag thyroid or cardiac issues. ⭐Optimal: 50–70 bpm. VO₂ max → A top predictor of long-term heart health; a 3.5-point increase cuts mortality risk by 11–17% ( British Journal of Sports Medicine , 2024). ⭐Optimal: Top 25% for your age & gender . Blood pressure → Silent but deadly. Track it at least every 6 months—or more often if you’ve had high readings. ⭐Goal: 110/70 mmHg Arrhythmias → Today’s wearables can catch issues like afib that random ECGs miss. 🔍 Imaging & scans: Catch issues before symptoms Calcium Score Non-contrast CT that reveals calcified plaque. Better predictor of heart attack than cholesterol. Start at 50—or earlier with family history/high Lp(a). Affordable ($100–$250) but misses dangerous soft plaques. Cleerly scan (CCTA with AI) Visualizes soft plaques, which are more unstable and risky. Best for those with family history, symptoms, or unexplained high cholesterol. Not covered by insurance; $2,000–$3,500. Cardiac MRI Shows heart structure and function. Detects scarring, inflammation, or damage. For patients with lingering symptoms or post-heart attack recovery. 💪What to do: Test early and support metabolic health. Testing is just step one. Here’s how to act on it: ✅ Bloodwork every year starting at 25 (or 35 if needed) ✅ Wearables to track trends and catch changes in real time ✅ Imaging by 50, or earlier if you have family history, high cholesterol, or risk factors All the testing in the world won’t matter if you don’t do anything to protect cardiovascular health. My top recommendations: 🍎 Eat for metabolic health Sugar: under 25g/day Fiber : 30–50g/day from veggies, legumes, nuts, seeds, and whole grains Protein : At least 0.7g per lb of body weight daily to balance blood sugar ⚖️ Keep visceral fat low Belly fat raises risk across the board Waist-to-height ratio <0.5 Get a full-body DEXA scan to assess 🏃‍♀️ Mix cardio, HIIT, and strength Zone 2 cardio : 180 min/week to boost fat metabolism and VO₂ max HIIT : 7% VO₂ max boost in just 8 weeks ( Medicine and Science in Sports and Exercise , 2007) Strength training : Builds muscle, improves insulin sensitivity, reduces fat 💊 Use meds strategically Statins : Lower LDL + ApoB. Lifesaving for many with persistent high cholesterol. GLP-1s : For those with excess weight or insulin resistance. Help lower fat and improve metabolic markers. 🍷 <1 drink/day Alcohol raises BP and triglycerides. Even alcohol intake is associated with an immediately higher risk of cardiovascular events (within hours) ( Circulation , 2016) 🧘 Yoga 3x/week Reduces blood pressure, inflammation, arrhythmias, and improves lipids (Int’l Journal of Yoga, 2024) ⚡Quick Hits 🧠 HRT timing & Alzheimer’s risk One of the biggest takeaways from reanalyzing the controversial Women’s Health Initiative HRT data is understanding how protective our hormones are. New data shows starting hormone therapy within 5 years of menopause was linked to a 32% lower risk of Alzheimer’s, while starting at 65+ raised risk by 38% (esp. with progestin). Another reason to be proactive. Questions about HRT? Book a free call at Parsley . Vitamin D + Exercise = Metabolic Boost As if we needed another reason to love Vitamin D! A meta-analysis of 18 randomized control trials found that pairing vitamin D supplementation with exercise lowered fasting insulin, improved insulin resistance, reduced triglycerides, and raised HDL more than either approach alone. My go-to D3 . 🌫️ Toxic mold: real or hype? More Americans are attributing fatigue, weight gain, brain fog, and even mood swings to “toxic mold.” Online communities of self-described “ moldies ” are booming. So how do you know if it’s legit? Here’s Parsley’s guide to mold toxicity symptoms . 💛The Momgevity Files This week, I’ve been thinking a lot about Dr. Jane Goodall—the anthropologist, chimpanzee expert, and renowned advocate for animals and the natural world—who passed away last week. To me, she defines longevity: both of body (she died at 91 and worked until the end) and of purpose. I didn’t realize how much she meant to me until she died. She’s someone I’ve been aware of since I was a small child. I remember learning about her in first grade at my girls’ school, and I think I understood, even then, that she stood for the kinds of qualities I could aspire to: passion, intelligence, resilience, fearlessness, grace, and dedication. While my work doesn’t directly intersect with animal research or conservation, and I hadn’t kept up with her latest activities in recent years, just knowing she was still out there fighting for her cause meant something. Her persistence, through what must have been countless setbacks as well as victories, quietly inspired me more than I knew. Her passing has made me reflect on my own path. I’ve spent the past decade building Parsley Health, fueled by a 20+ year obsession with transforming human health. Passion, it turns out, requires stamina and sacrifice. I took just two weeks of maternity leave with each of my three children—something I don’t exactly regret, but also can’t quite believe. Now, as my kids grow older and Parsley approaches its 10-year anniversary, I find myself reckoning with the duality of it all: the joy of purpose, and the cost of relentless pursuit. Dr. Goodall reminds us that longevity is about more than clear arteries, optimal metabolism, and balanced hormones. Longevity also means sustaining the fire of passion and purpose, those things that make life meaningful. Whether that passion is for raising your children, pursuing work outside the home, or championing a cause close to your heart. To have real longevity, you have to want to keep going, no matter what. Jane knew she would never truly finish the work, that the cause would outlast her, just as mine will outlast me. But she kept going anyway. At the end of the day, we can have the healthiest bodies possible, but what really keeps us going is meaning. For me, that continues to be transforming human health. It’s also my children and my family. And it’s being the woman I imagined I could become back in first grade—the one Jane inspired me to be so early on. My goal is to be her, right up until the end. Stay strong, stay curious, and breathe, Robin Keep Reading Should we put statins in the water? VO₂ max: If you only track one number for healthspan, make it this one 100 Essential Labs Every Woman Should Be Tracking Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Testosterone Therapy Is Trending—But Is It Right For You?
URL: https://www.robinberzinmd.com/testosterone-therapy-for-women/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: Most women benefit from testosterone therapy as part of a thoughtful HRT plan. It benefits mood, libido, energy, muscle, and bone health.
Plus, what your hair tells you about your hormone levels. Robin’s Short Version Free T Is What Counts: Only 1–3% of testosterone is biologically active; oral birth control and low-protein diets raise SHBG, trapping even more of it. Side Effects Signal Overdose: Acne, hair loss, and mood swings from testosterone therapy aren’t inherent risks—they mean the dose needs to come down. Standard HRT Has a Gap: Most women receive only estrogen and progesterone, leaving testosterone—which protects libido, muscle, and bone—completely unaddressed. Is testosterone therapy the holy grail for midlife energy and libido—or just another biohacking fad? Last week, the New York Times finally covered testosterone therapy for women . I was glad to see it. A decade ago, when I was first training in functional medicine at a high-end anti-aging clinic, testosterone was prescribed to men all the time. But for women? Almost never. Even in “forward-thinking” clinics, testosterone for women was rare. That gender bias stuck with me. Now, the pendulum is swinging in the other direction. Women are finally getting access to testosterone, which is a major step forward. The problem is it’s often prescribed at doses that are way too high. The result: acne, hair loss, mood swings, and even clitoral enlargement. The truth is, most women—but not all—do benefit from testosterone support as part of a thoughtful HRT plan. The benefits to mood, energy, libido, bone, and muscle health are well-documented. Let’s dig into what testosterone actually does (for women and men), when HRT makes sense, and how to find your optimal dose. 🤓 What to know: Testosterone is an essential longevity hormone for both women and men. Testosterone is an androgen—a sex hormone produced in women by the ovaries and adrenal glands, and in men by the testes. Two key forms matter: Total testosterone = the overall amount circulating in your blood. Free testosterone = the biologically active portion (1–3%) that’s not bound to proteins like SHBG and can bind to receptors in your brain, muscles, and tissues. In both women and men, testosterone supports: Libido and sexual satisfaction Muscle mass and strength Bone density and remodeling Mood, motivation, and energy 🔽 Testosterone declines with age ♀️For Women: Begins dropping in the mid-30s By menopause, levels can fall by up to 50% ❌ Add chronic stress? That depletes DHEA, a key precursor to testosterone. ❌ Add oral birth control, low-protein diets, or thyroid imbalance? Those can raise SHBG, trapping more testosterone and lowering the free, usable form. ♂️ For Men: Peaks in late teens to early 20s Declines by ~1% per year after age 30 ❌ Stress, poor sleep, excess body fat, and inactivity accelerate that decline and promote conversion of testosterone to estrogen. 🚺 Testosterone Is Still Missing from Most HRT Plans Most women are prescribed standard HRT—typically an estrogen patch and oral progesterone—and that’s it. No hormone testing. No personalization. And rarely any discussion of testosterone. Why? Testosterone is regulated and requires an in-person prescription, which limits access. Most OB-GYNs and PCPs weren’t trained in modern hormone science or how to prescribe HRT in a balanced, responsible way. Many doctors still believe HRT is dangerous , despite strong evidence that HRT reduces risk for breast cancer, dementia, osteoporosis, and heart disease. Online hormone clinics have exploded, but most are built for men. The few that focus on women often skip testing and personalization entirely. 📉 The result? A generation of women being told they’re “treated,” while a crucial hormone is completely overlooked. ⚖️ Side Effects usually mean you’re overdosed Symptoms in women and men can be obvious: In Men: Acne Hair loss Mood swings or aggression Increased red blood cell count (which can raise clot risk) Testicular shrinkage Infertility In Women: Acne and oily skin Hair loss (a supplement like saw palmetto can help) Rage or increased irritability Fluid retention Clitoral enlargement (especially when using high-dose cream directly on genitals) 🚫 Who Should Avoid Testosterone Therapy Testosterone isn’t for everyone. Situations where it should be avoided include: History of breast or prostate cancer (especially hormone-sensitive) → A portion of testosterone is converted to estrogen in the body, which may stimulate tumor growth or recurrence. Severe cardiovascular disease or elevated red blood cell count → Testosterone can thicken the blood, raising the risk for stroke or heart attack. Pregnancy or breastfeeding → T can disrupt fetal development and may lower milk supply by suppressing prolactin. Untreated PCOS, severe acne, or androgenic alopecia → Testosterone may overstimulate already sensitive androgen receptors and oil glands. Lack of hormone testing → If you haven’t had a full hormone panel, don’t guess—test first. 💪 What to do: Start testing in your 30’s and dose for balance, not biohacking. Here’s how I think about testosterone therapy for myself and my patients: I’m 44 and currently test my sex hormones twice a year through Parsley Longevity Labs . Right now, my testosterone is in the low-normal range. I feel great: no symptoms of perimenopause, no issues with mood or libido. So I’m not taking any HRT yet. When my total T drops below ~20 ng/dL and I start feeling symptoms—fatigue, low libido, difficulty building muscle—that’s when I’ll add support. 🧪 Step 1: Test—Don’t Guess Get baseline levels of: ✔️ Total and free testosterone ✔️ Estrogen ✔️ Progesterone ✔️ DHEA Too many clinics skip this. That’s how women end up on male-level doses—and with avoidable side effects. ⚖️ Step 2: Dose for Balance, Not Biohacking Most women feel best when their levels match those seen in their 20s–30s: Total T : 40–70 ng/dL Free T : 1.1–4.5 pg/mL You don’t need sky-high numbers to see big benefits, just the right amount, consistently delivered. 💊 Step 3: Pick the Right Delivery Method 💧 Topical creams or gels: My go-to for women. Absorbed through the skin, easy to titrate and adjust. Absorption varies person-to-person, so test regularly. 💎 Pellets : Convenient but inflexible. Tiny implants under the skin that release testosterone over 3–4 months. If you’re over- or under-dosed, you’re stuck until it wears off. (We don’t use at Parsley.) 💉 Injections : Not ideal for women due to hormonal peaks and crashes. Whatever you choose: monitor levels, track symptoms, and adjust over time. ⚡Quick Hits 🧠 Creatine isn’t just for workouts A new 12-week RCT showed it improved memory, attention, and executive function. It may even help delay or slow early cognitive decline. Add 3-5g of clean creatine to your morning H2O. 🦴Microplastics harm bone health A recent review found that bone-building cells absorb micro- and nanoplastics, triggering inflammation, breaking down bones and inhibiting bone building function. Yet another reason I’m taking AlgeCal Plus to promote osteoblast activity and build bone mineral density. 💇‍♀️ Your = early hormone signal A new study shows menopausal hormone changes can affect hair follicles a decade before you start noticing other symptoms. If you’re experiencing hair loss or changes get Parsley Longevity Labs ASAP as a starting point. 💛 The Momgevity Files If you follow me on Instagram, you know I just got back from Las Vegas, where I spoke on a panel at HLTH—which I call the “Super Bowl” of healthcare conferences. I’ve been going for years, and let’s just say: wandering through smoke-filled casinos and not seeing daylight for 48 hours is not my idea of a healthy time. The irony of 10,000 healthcare execs defining the future of the industry in that setting always makes me laugh. This year, though, I finally decided to Vegas my way. I landed and went straight to Whole Foods to stock up on snap peas, hummus, shrimp cocktail, glass-bottled water, and macadamia nuts so I could avoid eating out when I didn’t need to. I also hit the gym for a 20-minute weight session and stretch as soon as I checked in to boost my metabolism and get blood flowing after flying. And before diving into back-to-back meetings, I went outside to work for an hour by the pool in actual sunlight, to reset my circadian rhythm. I’ve skipped those things in previous years, and wow—it made a difference. My energy was steadier, my sleep was better, and I actually felt good the whole time. It was a good reminder that sometimes we have to work a little harder if we want something better than the status quo—especially when it comes to health. That point hit home again for me on stage. One of my fellow panelists—a brilliant cofounder of a women’s health startup—said she believes the only things we access for our health should be covered by insurance. In a rare moment of abject disagreement, I had to jump in. I understood what she meant. We all spend a lot on insurance through our paychecks and taxes, and I deeply wish the right care was always covered. But the simple fact is—it’s not. Insurance covers very basic screening, and catastrophe if you become very ill. But sadly, it covers very little in between. For example, insurance doesn’t pay for hormone testing for women, or DEXA scans to assess bone density before you’re 65—even though bone loss starts in your 30s. It doesn’t cover mercury testing, even though our sushi habit has pushed U.S. mercury levels through the roof, harming brain health and immunity. It doesn’t fund prevention or health optimization. It pays for disease management. Even many of the female-founded companies doing great work in women’s health are still bound by those same limitations—because when insurance dictates the limits of care, quality suffers. (At Parsley, we’re in-network for about 16 million people, but we also charge a program fee for non-covered services—because our model goes far beyond what insurance pays for.) The reality is: if we only accept what’s covered today, despite how outdated and out of sync the insurance system is with our needs, we’ll never be well. So just like I draw my own line around Vegas—a place that’s comically expensive yet fails to give me what I need (groceries, gym, sunlight, sleep)—I draw one for our medical system, too. The flow of the system is what’s making us sick. I’d rather step out of it and be a wellness warrior. The alternative is being the worried sick—and sadly, insurance doesn’t pay for that either. Stay strong, stay curious, and breathe— Robin Keep Reading Is estrogen the ultimate longevity drug? How to achieve optimal hormone balance, regardless of age It’s raining men(opause) Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Forget Weight—Muscle Mass Is the Real Longevity Metric.
URL: https://www.robinberzinmd.com/muscle-mass-is-the-ultimate-longevity-metric/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: We’ve all been trained to chase a lower number on the scale. The truth? Weight is the wrong metric for healthy aging. Build muscle mass.
What if the number on your scale is doing more harm than good? In every longevity conversation I have—whether on stage or in an exam room—someone asks: What’s the one thing I should focus on to live longer? Robin’s Short Version Muscle Predicts Mortality: Adults with low skeletal muscle mass face a 57% higher risk of all-cause mortality—a stronger longevity signal than BMI or weight. Lift With Precision: Training at 60–85% of your one-rep max for 6–12 reps, 2–3 times per week builds muscle; pilates and yoga alone won’t get you there. Hit the Leucine Threshold: Eating 25–35g of high-quality protein per meal triggers muscle protein synthesis—a signal that gets harder to activate as you age. My answer is always the same: build muscle mass. We’ve all been trained to chase a lower number on the scale and to measure our health (and for women, too often our worth) by that number. The truth? Weight is the wrong metric for healthy aging. What actually predicts how long (and well) you’ll live is your body composition—especially lean muscle mass. Adults with low skeletal muscle mass have a 57% higher risk of all-cause mortality ( PLOS One , 2023). Here’s what to know about how muscle mass will protect your future self. 🤓 What to know: Women with >70% lean muscle mass live longer. Women lose 3-5% of their total muscle mass per decade starting in their 30s. Building lean muscle mass now will decelerate your trajectory of aging. Why? Muscle: 🩸Absorbs blood sugar 🔥 Boosts resting metabolic rate 🧬 Increases libido 🦴 Stimulates bone building 🧠 Clears the brain ❤️ Lowers blood pressure 🔥Lowers “inflammaging 🛡️Builds stress resilience Optimal body composition = 🔼 skeletal muscle + 🔽 visceral fat Key body composition metrics and optimal ranges: Lean Mass (total & regional) Total muscle and other lean tissue (minus fat and bone). The most important determinant of metabolic health and longevity. Women over 65 with low muscle mass are 63 times more likely to die early than their stronger counterparts ( Journal of Bone and Mineral Research , 2019). 🌟 Optimal rang e: 70–75% for women; 80–85% for men Skeletal Muscle Index (SMI): Total lean muscle mass in your arms and legs ÷ height. Tells you how muscular you are for your frame. Lower SMI = higher mortality risk ( PLOS One , 2023). 🌟 Optimal range: ≥ 6.5 kg/m² for women; ≥ 8.5 kg/m² for men Visceral Adipose Tissue (VAT): Deep fat around organs. Elevated VAT drives inflammation, insulin resistance, and cardiometabolic disease. High VAT is independently associated with shorter lifespan, even in people with “normal” BMI ( Circulation , 2021). 🌟 Optimal r ange: <1 lb for women; <2 lbs for men Android/Gynoid Ratio (A/G): Indicates fat distribution—whether you store fat around your organs or hips/thighs. Higher ratio signals higher metabolic and cardiovascular risk. 🌟 Optimal range: < 0.8 for women; < 1.0 for men 📌 Best way to measure all of this? A full-body DEXA scan. (I wrote about it in detail here .) Ten minutes. ~$100. Totally worth it. 💪What to do: Lift heavy, time your protein, supplement strategically. You don’t need to become a bodybuilder. But you do need to train with intention. Here’s my muscle-support protocol: 🏋️ 1. Prioritize 20-30 minutes of heavy resistance training. Lift 60-85% of your one-rep max Perform 6–12 reps, 3–5 sets per muscle group Stop 1-2 reps shy of your max effort—you don’t need to train to failure ( Journal of Sports Health and Science , 2021) Train each muscle group 2–3x/week ( Sports Medicine , 2016) ⚠️ Pilates and yoga are great for mobility and core strength but not muscle growth. Think of them as supporting tools, not your main strategy. 🥩 2. Pace your protein Leucine—the key amino acid that triggers muscle protein synthesis—is the metabolic signal that tells your body to build new muscle. As we age, that signal gets harder to trigger, meaning we need more high-quality protein to hit the threshold. Target ~0.7 g per lb of ideal body weight daily. Going higher adds little extra benefit ( British Journal of Sports Medicine , 2018). Hit 25–35 g of high-quality protein per meal to reach the leucine trigger point ( Frontiers in Nutrition , 2024). Timing around workouts helps—but total intake matters more 🍞 3. Eat carbs for intense lifting Carb loading doesn’t have much of an impact on performance and recovery unless you’re lifting 10+ sets per muscle ( Nutrients , 2022). Eat 0.5–1 g carbs per lb of body weight before/after training Pair with protein to replenish glycogen and support repair Focus on real foods: oats, sweet potatoes, quinoa, rice 💊 4. Evidence-based supplement support Creatine monohydrate (3–5 g/day): Boosts strength, lean mass, and may support cognition ( Alzheimer’s & Dementia , 2025) Urolithin A (500–1,000 mg/day): Improves muscle strength and endurance in middle age ( Nature Aging , 2022). Fortetropin® (2.5 g/day): Early evidence on this one, but may boost muscle protein synthesis ( PLOS One , 2023) CTA: RBMD WELCOME ⚡Quick Hits ⏱️ Longer walks beat shorter ones A new analysis finds that continuous movement ≥15 minutes lowers heart risk better than racking up the same steps in lots of 5-minutes-or-less spurts—especially if your total step count is under ~8,000 steps/day. I’m committing to logging at least one 15 minute walk per day with my WHOOP . 💊 Start estrogen earlier Starting estrogen early —10 years before menopause—may slash the risk of breast cancer, heart attack, and stroke by up to 60%, per new data . Establish your baseline and track hormone levels with Parsley Longevity Labs . 🌍 Is breast cancer care better abroad? American women are increasingly denied access to intraoperative radiation therapy (IORT)—a single-dose treatment given during breast-cancer surgery that’s standard in many countries. Experts say the real issue is profit. Forward this to the women you love. 1 in 8 will face a diagnosis. 💛The Momgevity Files Happy Halloween! My love-to-love-slash-love-to-hate holiday is officially over. I love dressing up. This year I was a rose—the international symbol of love and, conveniently, a great excuse to buy one of those beautiful Mexican Day of the Dead flower crowns. I love the joy my kids get from planning and wearing their costumes. And I love the parties and the sense of anticipation. What I don’t love: the flood of corn syrup, ultra-processed foods, and red dye I’m constantly trying to shield my kids from—like that bird sheltering her chicks from the rain with outstretched wings in that viral Instagram image. I’m mystified by the commercialization and glorification of hoarding and binge-eating sugar. Watching kids trick-or-treating and stuffing bags with more candy than anyone should eat in a year always leaves me feeling a little sad. And I wrestle with the tension between wanting my kids to participate and have fun, and wanting to protect them from foods that harm their bodies. This year, I let each kid keep their 15 favorite pieces of candy (which, to me, already felt like a lot), and we put the rest from trick-or-treating back in the bowl to give out to others. My oldest—my most stubborn—resisted. He held on to 27 pieces (giving away 39!!) then snuck off and ate half in his room. I tried logic and support instead of consequences and firmness. Neither worked. He crawled into our bed Friday night complaining of a headache and stomach ache. I think the lesson landed, but he’s learned it before and forgotten. He’s only eight. He’s not ready to make this call on his own. (And for those of you suggesting the Switch Witch—trust me, we got a solid year out of that one. The kids are too smart for it now.) As a parent who cares deeply about health and nutrition—and someone who’s spent the past 15 years working to make America healthier (long before MAHA had any political affiliation—I’m deeply annoyed by where that’s gone, but that’s a conversation for another day) I think a lot about the cultural forces shaping our relationship to food, starting from a very young age. I am not a go-with-the-flow mom. We make all their breakfasts and lunches, cook dinner most nights, teach our kids how to read food labels, and make sure there’s protein and vegetables on every plate. We try not to label foods as “good” or “bad,” because the research shows that moralizing food can increase disordered eating. We love food, and we celebrate it. So when the “flow” turns into a full-on tsunami of sugar worship, it’s hard not to feel drenched and defeated. I know my kids will be fine, even though they had a night of candy overload. That’s not what worries me. I have all the tools to rehab their microbiome. What I do worry about are the messages we’re sending our children—the idea that ultra-processed, high-sugar packaged foods aren’t an occasional indulgence, but the background noise of childhood. That’s the real concern. I trust that my values will take root. But as a longevity mom, I wish our culture made it easier to raise kids in a way that supports healing and thriving, not just coping and indulging. In the meantime, like all of us, I’m doing my best. That means communicating with clarity and love. Learning year by year. And trying—always—to celebrate collective joy while protecting our personal wellbeing. Stay calm, stay curious, and breathe, Robin Keep Reading How Much Does Vigorous Exercise Really Matter? Why so many women are using creatine (including me) VO₂ max: If you only track one number for healthspan, make it this one Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## What a CGM Can Tell You About Your Aging Velocity
URL: https://www.robinberzinmd.com/what-a-cgm-can-tell-you-about-your-aging-velocity/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Energy, bloating, brain fog and weight gain are all tied to blood sugar. So is aging velocity. A CGM can help you optimize your longevity.
Plus, how to lower your blood sugar in 30 seconds. Robin’s Short Version Squats Over Cardio: 10 squats every 45 minutes outperforms a 30-minute walk at lowering post-meal glucose spikes by activating GLUT4 transporters in muscle. A1C Isn’t Enough: A normal A1C masks dangerous glucose variability, which is independently linked to smaller hippocampal volume and elevated dementia risk. Spikes Age You: Each glucose spike drives AGE formation—molecules that stiffen blood vessels, break down collagen, and disrupt DNA repair at the cellular level. How fast you age depends on how fast your blood sugar spikes. Energy, bloating, brain fog and weight gain are all tied to blood sugar. So is aging velocity. Every glucose spike is a micro-hit of oxidative stress and inflammation—tiny but cumulative wear and tear at the cellular level. When glucose rises quickly, it fuels the formation of advanced glycation end products (AGEs)—molecules that stiffen blood vessels, break down collagen, impair mitochondria, and disrupt DNA repair. These are hallmarks of accelerated aging. In other words, stabilizing your blood glucose is one of the most effective ways to lower your biological age. And yes, there’s a lot of noise around CGMs lately. But if you’re looking to keep your blood sugar steady through the holidays (and beyond), here’s what’s actually worth your attention. ⚡ Forward This Protocol One thing that lowers your post-meal glucose spikes more than cutting carbs, skipping sugar, or taking supplements? 30-second exercise snacks. Doing 10 squats every 45 minutes outperforms a 30-minute walk in lowering glucose ( Scandinavian Journal of Exercise and Science In Sports , 2024). Why? Your muscles act as glucose sponges—even a few squats turn on GLUT4 transporters, which shuttle sugar out of the blood and into your cells. It’s the single most overlooked tool for reducing cravings, fatigue, and blood sugar spikes. 👉 Forward this to your friends with desk jobs. 🤓 What to know: Lower average blood sugar and glucose variability to slow aging. The two blood sugar metrics that matter most for longevity: 🩸1. Average glucose (Estimated by HbA1c or CGM-derived metrics like GMI) High average glucose accelerates glycation, vascular aging, and mitochondrial stress. Every 1-point increase in HbA1c ( e.g., 5.5 → 6.5 ) cuts your odds of reaching 100 by 67% ( Frontiers in Nutrition , 2022). 🩸2. Glucose variability (Measured most accurately by CGM) Longevity isn’t just about your A1C—it’s about how smooth your daily curve is. Higher variability = faster aging ( Metabolism , 2023), more oxidative stress in neurons, smaller hippocampal volume, and elevated dementia risk ( NPJ Aging , 2024) 6 Surprising Drivers of Glucose Spikes Naked carbs (no protein or fat) → Sharp insulin spikes, NF-κB activation, and inflammation Stress → Cortisol signals your liver to dump glucose into your bloodstream Poor sleep → Just one bad night can raise glucose by 20–30% Sedentary days → Less muscle movement = less glucose uptake Late-night meals → Insulin sensitivity dips at night Ultra-processed food → Rapid digestion + low fiber create ultrafast glucose surges; additives can impair GLP-1 signaling 4 common blood sugar myths worth forgetting 1. “A vinegar shot before your meal can lower glucose spikes.” Evidence is weak and inconsistent, especially in healthy adults. Instead: Eat the protein on your plate first. 2. “Avoid every carb to lower blood sugar.” What matters is quality (high-fiber, whole grain) and pairing (carb + protein + fat). Instead: 25–35g of dietary fiber per day is associated with significantly lower all-cause mortality and improved glucose control ( Diabetology & Metabolic Syndrome , 2025). 3. “Protein spikes insulin, so limit it.” Protein does raise insulin—in a good way. It builds muscle, stabilizes glucose, and prevents over-eating later. Instead: Aim for ~30g of protein at every meal. 4. “My A1C is normal, so I’m good.” A1C only measures averages. You can have “normal” numbers and still have massive spikes and volatility that drive inflammation and speed aging. Instead: Use a CGM quarterly to monitor real-time variability. 💪 What to do: Measure glucose in real-time, pair food and exercise strategically, get serious about lowering stress. ✅ Step 1: Track hbA1C + real-time glucose variability Test HbA1c 1x/year. A lot can change in the body in a year. Track via Parsley’s Longevity Labs . Use a CGM 4x per year to track how food, sleep, stress, and movement are landing in your body. 🍽️ Step 2: Pair your carbs + pay attention to food order Eat fiber + protein first, carbs last. Just changing food order (not what you eat) can reduce glucose spikes and improve “time in range” ( Diabetes Care , 2015). 🏃 Step 3: Move immediately after meals A 10-minute walk immediately after a meal beats a longer walk taken later ( Nature Scientific Reports , 2025). 10 body-weight squats every 45 minutes is also more effective than a 30 min walk ( Scandinavian Journal of Exercise and Science In Sports , 2024). 😴 Step 4: Prioritize 7-9 hrs quality sleep. One week of 5-hour nights → 23% drop in insulin sensitivity and elevated glucose ( Diabetes , 2010). Top sleep supplements: Magnesium glycinate (300g), L-theanine (100–200 mg), Glycine (3 g) 🧘 Step 5: Set a timer for 5-minute breathing exercises during holiday chaos 5+ minutes of slow breathing or meditation (especially surrounding meals) can reduce post-meal glucose spikes ( Journal of Alternative and Complementary Medicine , 2013). 🦠 Step 6: Support your microbiome Emerging research suggests Akkermansia muciniphila is linked to better glucose control and lower inflammation ( Gut Microbes , 2021). Consider a probiotic that includes it, or focus on polyphenol-rich prebiotic foods. 💛 The Momgevity Files While we’re not a super observant family (my husband and I were both raised with a mix of Judaism and Christianity, making us mutts of sorts when it comes to religion), we do make an effort each Friday to celebrate Shabbat—a tradition that, for Jews and non-Jews alike, feels to me like a beautiful way to close out the week as a family. Our setup is pretty basic: we light candles, say a prayer, and each share what we’re thankful for that week, including the kids. Even our 4-year-old loves to chime in—sometimes he’s grateful for school, sometimes dessert, sometimes Mama and Daddy. Thanksgiving, to me, is sort of like a collective American Shabbat. It’s a time to slow down, be with family, celebrate life, and practice gratitude. But that gratitude piece often gets lost in the chaos of travel, football games, family dynamics, and a holiday that’s now more associated with overeating and Black Friday sales than with giving thanks for all we have. A 2023 meta-analysis showed that gratitude practices (like journals, writing letters, or simple exercises like our Shabbat tradition) are linked to lower rates of anxiety and depression, greater life satisfaction. (One observational study on gratitude even showed a 9% lower risk of all-cause mortality.) I’ve been thinking about this a lot as I plan our Thursday. I’ve been poring over recipes and gearing up to cook all day, which is something my husband and I really enjoy. Amid the overwhelm of hosting and managing unruly children who are out of school, I’ve been reflecting on what a gift it is to spend a day making healthy, delicious food—and what an opportunity it is to be grateful for all I have: family, safety, warmth, a good meal. The entire day can be its own gratitude practice, its own 24-hour longevity boost. Of course, holidays can also bring up stress and painful things to reflect on. I acknowledge that. But ultimately, as I remind my kids, we own our happiness, the world doesn’t owe it to us. And whether life is exactly what we want it to be, or far from it, either place is a perfect starting point for gratitude. It will only make things better—and give us the chance to keep living our complicated, beautiful life story a little bit longer. Happy Thanksgiving everyone! Stay strong, stay curious and breathe, Robin ⚡One last thing… 🔍 Big news! The First Functional Lab Review with a Doctor is here! In Parsley news, we just launched the 30 Minute Clinical Lab Review Visit ! Get our longevity labs and add on a visit with one of our board certified functional medicine providers to go over them live and develop a personalized action plan. Use code BF50 for $50 off! Have labs already from another lab company? BYO labs and do the 30 min live visit to review them and get an action plan! Get on the waitlist to be first to get your lab review! Keep Reading Chronological vs. Biological Age: Which One Really Matters? 4 fasting for women strategies to optimize longevity. How to Slow Brain Aging Starting in Your 40s Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is Sleep Consistency the Most Overlooked Lever of Longevity?
URL: https://www.robinberzinmd.com/sleep-consistency-for-longevity/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Most sleep advice focuses on quantity. For women trying to improve metabolic health and reduce inflammation, sleep consistency matters more.
Plus, The 30-30 Rule I’m committing to this season. Robin’s Short Version Timing Beats Duration: Irregular sleep cuts next-day insulin sensitivity by up to 25%, even when total sleep hours are adequate. The 30-30 Rule: Keeping bedtime and wake time within a 30-minute window prevents the inflammation spike triggered by 60-minute swings. Mitochondria Pay the Price: Poor sleep causes mitochondria to fragment and accumulate damage, driving a biological cascade tied to faster aging. Poor sleep is linked to over 170 health conditions. Honestly, I’ve always been a little irritated by the sleep-preaching crowd. It’s not that I doubt the science linking sleep to longevity—I just haven’t been great at prioritizing it. I’m a “sleep-when-I’m-dead” kind of woman. But this month I read a fascinating study in Nature about one of the reasons why sleep is so strongly linked to longevity: when you don’t get enough sleep—either in quantity or quality—your mitochondria begin to fragment and accumulate damage. That damage can drive a cascade of dysfunction and disease. My sleep schedule is all over the place, but it didn’t seem like it was doing me much harm. Because I live the Parsley lifestyle, at 44, my metabolic health is strong, my chronic disease risk is low, and my labs still look like they belong to someone in her 30s. Then I ran my WHOOP biological age test. After 30 days of data collection, WHOOP pegged my biological age at two years older than my actual age. WTF. Along with not doing enough cardio, the biggest contributor to my advanced biological age? Sleep inconsistency. Time to start paying attention. ⚡ Forward This Protocol Here’s the sleep hack no one talks about: If your bedtime swings more than 60 minutes, you age faster. Period. Even a one-hour swing in sleep timing spikes next-day inflammation and raises your metabolic risk factors ( Diabetes Care , 2019). The fix is ridiculously simple: The 30–30 Rule. Keep your bedtime within 30 minutes Keep your wake time within 30 minutes Even if you get less sleep overall this season, prioritizing The 30-30 rule will: Lower cortisol Improve metabolic flexibility Support a younger biological age 👉 Send this to a friend with the busiest social calendar. 🤓 What to know: Sleep consistency is more important than duration for inflammation and metabolic health. Most sleep advice focuses on how much you sleep. That’s important—but for women trying to improve metabolic health and reduce inflammation, when you sleep may matter more. ⏰ Inconsistent sleep confuses your circadian clock Your circadian rhythm is regulated by a master clock in the brain—the suprachiasmatic nucleus—but it relies on regular sleep and wake cues to stay synced. When those cues shift night to night, your downstream clocks (in the liver, pancreas, gut, and heart) fall out of rhythm. That can lead to: Metabolic instability Mood swings Decreased immune function 🔥 Irregular sleep timing increases inflammation Studies show that just a few nights of inconsistent sleep can elevate next-day inflammatory markers like IL-6 and CRP—especially in women ( Frontiers in Neurology , 2020). 📉 Sleep inconsistency worsens metabolic health Late or irregular bedtimes shift your cortisol and melatonin secretion curves, which reduces next-day insulin sensitivity by up to 25% ( Diabetes, Obesity and Metabolism , 2018). Even when they’re getting enough sleep, people with irregular sleep schedules have significantly higher odds of metabolic abnormalities ( Diabetes Care , 2019) including: High fasting glucose High triglycerides Low HDL Elevated waist circumference 💓 Inconsistent sleep blunts your cardio fitness response Sleep inconsistency raises baseline sympathetic tone ( Frontiers in Neurology , 2025), meaning your body may have a harder time recovering from stress or workouts. 😴 Sleep duration still matters—but differently For next-day inflammation and metabolic stability, sleep consistency is the lever most women overlook (and the one that has the fastest impact). But for optimal longevity, you need all three levers—consistency, quality, and duration—working together. Think of it this way: Consistency = metabolic stability Duration = long-term cognitive and cardiovascular disease risk 💪 What to do: Build the three sleep habits that matter most for longevity. You don’t need a perfect bedtime ritual. Just a repeatable one. These are the three most impactful ways to support sleep-driven longevity by calming inflammation, stabilizing your circadian clock, and optimizing mitochondrial recovery. ⏰ Step 1: Lock in your sleep window This is the fastest lever to pull if you want to improve next-day metabolic function. Bedtime: Stay within a 30–60 minute window Wake time: Stay within 30 minutes Sleep duration: 7–9 hours (Women often need slightly more due to higher slow-wave sleep needs, menstrual cycle–related recovery demands, and more fragmented sleep in perimenopause/menopause.) 😴 Step 2: Optimize sleep quality (Deep + REM) Deep (slow wave) sleep handles physical repair and glucose regulation; REM handles emotional regulation and memory consolidation. If you’re tracking via a wearable, Deep + REM Sleep should account for 40-50% of your total sleep time. Simple ways to increase restorative sleep: Avoid screens 30 min before bed (blue light delays REM). Cool your room to 60–67°F. (Temp-controlled beds like Eight Sleep help if you run hot.) Take a warm bath or shower . (Core temp drop helps with sleep onset.) Block all light with blackout curtains or an eye mask. (Even tiny amounts of light suppress melatonin.) Nasal breathing via mouth taping a few nights/week reduces night wakings. 🍽️ Step 3: Eat to prevent 3 a.m. wake-ups Blood sugar crashes are one of the most common reasons women wake between 2–4 a.m. Dinner: 30–40g protein, 15–25g healthy fats, 20–40g complex carbs (avoid refined carbs/sugar) Bedtime snack (if needed): 10–15g protein, 8–12g fat, low or no sugar 💊 What about supplements? ✅ Use: Magnesium glycinate (400 mg): Calms the nervous system, supports deeper sleep. (Especially helpful in the luteal phase.) ⚠️ Use strategically: Melatonin (1 mg): Best used as a circadian reset tool, not a nightly sleep aid. Ideal for jet lag or short-term disruptions to your schedule. 🚫 Avoid: Ambien + benzodiazepines: Can disrupt sleep architecture, increase mortality and dependency risk. Antihistamines (Benadryl, Unisom): Reduce deep sleep, impair next-day cognition. Alcohol: Blocks REM, raises resting heart rate, and prevents normal core temperature drops. 💛 The Momgevity Files One of my best longevity-minded mom friends (who also happens to be a champion skier) likes to say, “There is no such thing as bad weather. Only bad gear.” I love this saying, and it’s been on my mind this week as we enter the thick of holiday season. It feels like we’re all contending with some collective weather right now. There’s the emotional weather of family dynamics and expectations. The scheduling weather of kids’ vacations, holiday events, and travel. And then the literal weather—here in New York, the cold wind and gray skies came in fast this year, leaving even the most seasonal-depression-proof among us feeling the chill. Last year at this time was particularly stressful for me. As we put up the Christmas tree today, I felt a wave of that memory return and, honestly, wanted to run away from these next few weeks. I caught myself wishing I could fast-forward to February, when my family’s Costa Rica trip is in sight, like skipping ahead in a movie. But instead, I’m facing the weather—and upgrading my gear. This season, “gear” looks like: Skipping alcohol wherever possible. It’s too much of a sleep disruptor and mood downer. Squeezing in workouts even when there’s no time and no desire, because that post-sweat clarity—whether from a pounding heart rate or a deep yoga stretch—is unmatched. Sauna hangs with friends. Saying no to some invitations. A daily gratitude list of ten things I’m thankful for, even on the tough days. It’s saying yes, like I did last night, to going out dancing—breaking routine just to move and lose myself in music. It’s giving myself space to meditate and actually feel my feelings, so they don’t get stuck and morph into anxiety, digestive issues, or headaches. It’s staying consistent with supplements and skincare, small rituals that feel grounding. And it’s repeating a daily affirmation: saying “hell yes” to exactly what is . (That one’s courtesy of my friend and coach Biet Simkin —if you’re not following her yet, you should!) Turns out, even the wildest storm, coldest day, or hardest rain can feel beautiful. If you’ve got the right gear. Stay strong, stay curious, and breathe, Robin Keep Reading The Cortisol Reset Every Woman Needs Chronological vs. Biological Age: Which One Really Matters? If You Only Fix One Thing for Longevity, Make It Your Mitochondria. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## The Cortisol Reset Every Woman Needs
URL: https://www.robinberzinmd.com/the-holiday-cortisol-reset-every-woman-needs/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: The goal is to cultivate a healthy cortisol reset rhythm—high when you need it, low when you don’t.The problem is chronic cortisol.
Plus, the breathwork technique I use to prevent ‘cortisol belly.’ Robin’s Short Version Try Cyclic Sighing: Two nasal inhales plus one long mouth exhale outperformed meditation and box breathing for immediate stress relief. Cortisol Drives Belly Fat: Chronic elevation spikes insulin and stores visceral fat around organs—even in women who aren’t overweight. Stress Fuels Cravings: High cortisol raises ghrelin and blunts leptin sensitivity, making hormonal imbalance the real driver of holiday weight gain. We talk a lot about abdominal weight gain, but rarely about the hormone driving it. Every year, people gain more than half of their annual weight between Thanksgiving and New Year’s and never lose it ( New England Journal of Medicine , 2000). We blame the cookies and cocktails, but the root cause of holiday weight gain often runs deeper: cortisol. Cortisol itself isn’t bad. You need it: it helps you wake with energy, think clearly, raise heart rate when needed, and maintain blood pressure. It’s adaptive and protective. The goal is to cultivate a healthy cortisol rhythm—high when you need it, low when you don’t. The problem is chronic cortisol. When cortisol stays elevated, it sets off a cascade: blood sugar swings, an uptick in belly fat, poor sleep (which worsens metabolism), immune suppression, and hormonal chaos. The good news I tell my patients all the time: your hormones are in your hands. Here’s how your daily habits can help reshape your cortisol curve to get you through the most stressful time of year. ⚡Forward This Protocol The fastest, evidence-backed way to lower cortisol right now: cyclic sighing . In a head-to-head trial of different stress-reduction techniques, cyclic sighing—two quick inhales through the nose, one long exhale through the mouth—outperformed meditation, box breathing, and cyclic hyperventilation on three fronts ( Cell Reports Medicine , 2023): Greatest immediate stress reduction Most sustained drop in physiological arousal Best improvement in mood Try it for 1 minute: Inhale through your nose Take a second, shorter inhale Long, slow exhale through your mouth Repeat 5–10 times 🤓What to know: Cortisol is the hormone that runs your day and your metabolism. Your cortisol follows a daily rhythm (highest in the morning and lowest at night) which is essential for energy, metabolism, immunity, and sleep. Cortisol is made in the adrenal glands but controlled by the HPA axis and your vagus nerve → strong vagal tone helps keep cortisol flexible, while poor sleep and chronic stress flatten or spike the curve. 🌀 Why cortisol matters for metabolic and hormonal health 1. Cortisol increases appetite. High cortisol increases ghrelin (hunger hormone), reduces leptin (regulates appetite, energy and weight) sensitivity, and drives cravings. 2. Cortisol elevates blood glucose and reduces insulin sensitivity. Cortisol mobilizes glucose for quick energy. Chronic cortisol elevation → higher baseline glucose → elevated insulin → impaired metabolic flexibility. 3. This leads to “cortisol belly.” Over time, this leads to insulin resistance and more abdominal fat ( Obesity Medicine , 2025). Even in women who aren’t overweight, high cortisol promotes visceral fat storage around the organs ( Psychosomatic Medicine , 2000). 4. Cortisol suppresses immune function. Short-term, cortisol downregulates inflammatory pathways ( Cells , 2023). Chronic elevation does the opposite, suppressing key immune cells and weakening viral defense ( Journal of Clinical Medicine , 2024). This is why people get sick right after stressful holidays. 5. Cortisol destabilizes sex hormones. High cortisol → high insulin → higher testosterone and estrogen production. This mimics PCOS-like patterns, worsens PMS, disrupts ovulation, and can impair fertility ( Frontiers in Endocrinology , 2023). 🔬 How to Measure & Track Cortisol Most “cortisol tests” on the market are useless. At Parsley, we use two validated tests: 1. 5-Point ZRT Cortisol Test (Saliva) Measures cortisol at 5 points across a single day: Low morning cortisol → fatigue, brain fog Midday cortisol dips → energy crashes, cravings High nighttime cortisol → wired-and-tired, poor sleep Flat cortisol curve → burnout, HPA axis suppression 2. DUTCH Hormone Test (Urine) Measures cortisol and cortisone (how you metabolize cortisol) Also evaluates estrogen, progesterone, DHEA, and testosterone pathways Ideal for women where stress + sex hormones are interacting (PMS, perimenopause, PCOS-like presentations). 🩸Why Parsley Longevity Labs don’t include a random cortisol blood test Because cortisol naturally fluctuates throughout the day, single-point blood tests are mostly irrelevant (unless you have Addison’s or Cushing’s). ⚠️ Wearables & cortisol: promising but not comprehensive. HRV and sleep tracking offer some insight into stress load. But they’re not substitutes for testing free cortisol in saliva or urine. I dream of a continuous cortisol monitor that shows how your stress shifts across your cycle, workload, sleep, and relationships. But until Santa delivers, we work with what we’ve got. 💪What to do: Get morning light, downshift daily, choose sleep over alcohol. There’s no way to completely avoid holiday cortisol swings (if you’ve cracked the code for a zero-stress December, please email me immediately). But you can meaningfully reduce it with an intentional, evidence-based routine: ☀️ Step 1: Get morning light within 60 minutes of waking Natural light anchors your circadian rhythm and strengthens your cortisol awakening response (CAR) → This translates to better energy, mood, and blood sugar. What to do: Step outside for 5–10 minutes, or even better, prioritize a morning walk. 😌 Step 2: Downshift daily with breathwork, meditation or sauna. These practices activate the vagus nerve , your body’s brake pedal for cortisol. Breathwork (5 min): Best for acute stress. Cyclic sighing outperforms meditation for immediate relief (Cell Reports Medicine, 2023). Meditation (15 min): My daily non-negotiable—even if a child is physically sitting on me. Increases vagal tone, reduces HPA axis activation, and improves emotional regulation. Sauna: Heat therapy boosts endorphins, then lowers cortisol via parasympathetic rebound ( Experimental Gerontology , 2021). 🏋️ Step 3: Prioritize movement—especially strength + low-intensity cardio Exercise is one of the best ways to clear cortisol from the system. Best exercise for cortisol regulation: Zone 2 cardio: Fast walking, easy cycling—discharges stress hormones. Strength training: Improves insulin sensitivity, which flattens cortisol-driven glucose spikes. Skip HIIT: During high-stress weeks, it can push your cortisol too high. 💤 Step 4: Choose sleep over alcohol One night of bad sleep can spike cortisol the next day, increase cravings, worsen insulin resistance, and lower your stress resilience. If you’re having a holiday drink, try to stop by 6 p.m. 💊 Step 5: Supplement strategically The right supplements help your HPA axis recalibrate, so cortisol can rise and fall appropriately. My top 3: HPA Adapt → Contains herbs that modulate HPA signaling—helpful when cortisol is too high at night or too low in the morning. Magnesium glycinate (200–400 mg) → Supports relaxation, sleep quality, and reduces nighttime cortisol. L-theanine (100–200 mg) → Promotes calm focus and smooths out cortisol-driven anxiety without sedation. 💛 The Momgevity Files On Saturday night, fully feeling myself in my favorite new sparkly holiday dress, I made the unusual choice to not follow my own advice and have a Negroni at roughly 11 p.m. It felt, let’s say, in the spirit. I’m not shaming myself for having a drink. The holidays create an ambient pressure system, like a weather event we all live through for a month. That pressure can drive unpredictable behavior. And unpredictability can be a good thing! But with two glasses of wine already in me, and a full Sunday ahead (ice hockey, soccer, and a board deck to finish), my unpredictability turned out to be less of a bold move and more of a tumble. I definitely felt the aftermath when I woke up. We all have unconscious ways of reacting to stress, often defaulting to coping mechanisms we’ve learned or mirrored. It takes real self-awareness to slow down and unwind that reaction cycle—to choose ourselves over the easy paths all around us. The holidays are full of collective peer pressure around consumption: shopping, food, alcohol, how we relate, how we spend money, even how we dress. Some of that is shared cultural joy, and some of it is uncomfortable norming. Where we land between the two depends on our ability to slow down and really listen to ourselves. So on Sunday, I turned to health as a practice—not a punishment. I rehabbed my aching head with a gluten-free muffin slathered in Kerrygold butter, two Epic beef jerky sticks, two double espressos, a very large water with Endura electrolytes, and two much-needed ibuprofen. I power-napped for thirty minutes mid-day. I weight trained in the evening when my energy came back. I sauna-ed out the toxins. I leveled out my see-sawing blood sugar with salmon and salads for dinner. My longevity philosophy is that I’m stopping the aging clock—but I’m not stopping my life. I live in the world, and I want to live in the world, including all its holiday messiness and the stress I can’t avoid or didn’t create but roll with anyway. For me, health is the place I return to in order to find center—not the thing I chase. That difference means everything this time of year. Stay strong stay curious and breathe, Robin ⚡One more thing… What to get for the person who has everything: a 1:1 visit with a Parsley clinician to review your labs (from any company!) and build a personalized health plan. Sign up for BYO Labs here ! Keep Reading How to reduce stress in 15-minutes How to balance cortisol levels to increase energy and lose weight Is Sleep Consistency the Most Overlooked Lever of Longevity? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Is your social life aging you?
URL: https://www.robinberzinmd.com/is-your-social-life-aging-you/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Loneliness raises cortisol, accelerates cellular aging, and is as harmful as smoking 15 cigarettes a day. Here’s how I make longevity a team sport — and w
Plus, how to make longevity a team sport. Robin’s Short Version Group Workouts Win: Exercising with others cuts stress by 26% and boosts mood—solo exercisers saw virtually no change, even training twice as long. Loneliness Inflames: Chronic loneliness raises cardiovascular disease risk by 30% and elevates CRP and IL-6, markers that directly accelerate biological aging. Your Circle Spreads: If a close friend becomes obese, your own risk rises 57%—your social circle actively reshapes your health trajectory, for better or worse. It’s the holidays and whether you’re surrounded by people or spending more time alone, this season has a very real way of surfacing how we feel about connection. I know people who are deeply lonely right now—and just as many who feel overwhelmed, up to their ears in gatherings, logistics, and endless expectations to be “on.” Both experiences reveal the same truth: our relationships shape our health —mental, emotional, and physical. I grew up steeped in peak individualism, with the belief that health was something I could earn entirely on my own: eat right, work hard, sleep well, stay focused. There’s value in that mindset—but it’s only half the truth. The other half is interdependence . And the science on interdependence is clear. Who we spend time with doesn’t just affect our moods, it changes our health trajectory. If a close friend becomes obese, your own risk increases by 57% ( New England Journal of Medicine , 2007) You’re more likely to smoke—and less likely to successfully quit—if your friends are smokers ( Psychology of Addictive Behavior , 2015) Social contagion is real. But so is positive influence. As we close out the year, I’ve been reflecting on how much of my own health is shaped by the people around me. “Build community” often sounds like a vague wellness slogan, but the pathways through which our social connections impact our longevity are very real. Here are five science-backed ways to build social connection that strengthens your body and extends your healthspan. ⚡Forward this protocol One of the most powerful ways to change your longevity and kill holiday stress? Do one group workout per week and get twice the benefit. Research shows people who exercise in groups see dramatically greater benefits than solo exercisers—even if they work out less. Participants in a group class reported: 26% reduction in perceived stress 24% improvement in physical health 26% boost in emotional well-being Meanwhile, those who worked out alone (or with one friend) saw virtually no change in stress or mood—despite working out twice as long ( Journal of the American Osteopathic Association , 2017). If you’re still in your solo, pandemic-era fitness groove, this is your sign: text a friend, book the class, start a crew. 🤓 What to know: Community is one of the strongest predictors of long-term health. The data is unambiguous: strong social ties are as important as not smoking and more predictive than exercise when it comes to long-term health. If you’re optimizing protein intake, exercise, and sleep, but neglecting connection, you’re missing a key longevity pillar. Here’s what the research shows: ❤️ Connection protects your heart. Loneliness raises cardiovascular disease risk by 30% ( Current Cardiology Reports , 2021). → Social support lowers blood pressure, inflammation, and sympathetic nervous system overdrive. 🧠 It strengthens your brain. Regular connection reduces dementia risk by up to 40–60% ( Aging Research Reviews , 2015). → Social engagement increases BDNF and synaptic plasticity. 🔥 It lowers chronic inflammation Loneliness increases inflammatory markers (CRP, IL-6) and weakens immune resilience ( Social Psychology , 2021). → Supportive relationships buffer cortisol and lower allostatic load. 🧬 It slows biological aging Women with strong social ties show slower epigenetic aging ( Brain, Behavior & Immunity , 2025). → Oxytocin release during social bonding improves mitochondrial efficiency and metabolic health ( IJSRA , 2024). 🩺 It improves recovery People with strong social networks recover faster from infections ( American Journal of Medicine , 2025). → Support buffers the body’s stress response, reducing harmful inflammation and promoting relaxation. 💪What to do: Don’t go your longevity journey alone. Longevity can sometimes feel like a lonely quest. You skip drinks with friends to protect your sleep, miss slow mornings with family to squeeze in a workout, and make choices most people don’t see or understand. This year, I started bringing others into my health practices and it changed everything. Here’s how to do it in a way that supports your healthspan and your relationships. 👯 Option 1: Turn Zone 2 into your social hour. Zone 2 cardio (your “talking pace”) is great for mitochondria, metabolic flexibility, and cardiovascular health—it’s ideal for connection. Social walking groups are associated with lower depression and improved cardiovascular markers ( British Journal of Sports Medicine , 2015). Try this: Replace one drink date per week with a 60 minute interval walk . Alternate 3 min brisk / 3 min conversational, at least 6 times. 💦 Option 2: Trade holiday dinners for sauna catch-ups. Every restaurant in the city is packed with friend groups having their annual holiday dinner. Move yours to a bathhouse where you can catch up in the sauna: Why sauna is a longevity tool: 40% lower all-cause mortality ( BMC Medicine , 2015) 50% lower cardiovascular mortality ( BMC Medicine , 2015) Sauna + cold plunge can lower stress for 12 hours ( PLOS One , 2025) Try this: Use the “three-round protocol”: 10 minutes heat → 1 minute cold → 5 minutes rest. 🪩 Option 3: Go dancing. Fun, yes. But also neurologically protective. Why it matters: Reduces dementia risk in older adults by 76%—more than any other activity studied ( New England Journal of Medicine , 2003). Boosts BDNF, the brain’s longevity molecule ( Clinical Interventions in Aging , 2024). 🍳 Option 4: Host a longevity breakfast club. Most people default to dinner. But mornings offer a biological edge for connection. Why it works: We’re wired for sociability earlier in the day (serotonin peaks in the a.m.) Avoids the cortisol spike and sleep disruption that comes with late-night plans. Try this: Host 2–3 friends once a month. Keep it simple: High-protein, high-fiber spread—eggs, chia pudding, berries, turkey sausage. 🤝 Option 5: Create a shared longevity ritual. This is small but powerful. Shared rituals increase oxytocin, deepen trust, and create rhythm. Try this: Choose one person and one recurring ritual: Monday matcha + 10-minute walk Friday sauna check-in Monthly health goals review Forward them this newsletter and make it a thing. 💛 The Momgevity Files Hanukkah kicked off this weekend and Christmas is right around the corner, and I’ve been thinking a lot about routine. The holidays can start to feel expected, even monotonous—same foods, same rituals, same logistics every year. But a parenting podcast I listened to recently reminded me that routine is powerful for children, and so is tradition. These familiar moments that happen year after year become the architecture of childhood. They’re how our kids make sense of a world that feels increasingly volatile and overstimulating. They form the core memories we return to for the rest of our lives. It’s tempting at holiday parties to list all the trips and events we have planned, to share the highlight reel. But life isn’t meant to be an endless string of “peak experiences,” no matter what social media tells us. I was appreciating this over the weekend as we added tinsel to the tree. I felt a wave of nostalgia and a renewed appreciation for the simple things we’ve always done: buying the Christmas tree, decorating it, the familiar ornaments that each carry a little pocket of memory. I’m usually the first one downstairs in the morning, and I always beeline to plug in the tree and marvel at the glow. I love how beautiful it is. We kicked off Hanukkah this weekend too. In the past few years, our tradition has been giving to a different charity for the first seven nights, and then on the eighth night the kids get a present. I like that we’re shifting the focus away from the gift avalanche and toward giving back. Because we celebrate Christmas too, it can otherwise feel like an onslaught of presents in a “too much” way. We’ve created our own tradition and found a modern balance, while upholding what has always been. The pursuit of longevity can feel like an attempt to outrun mortality. But longevity is also about remembering the long line of people we come from—those who set traditions generations before us. People we never met, but whose lives have informed our experiences today. It’s carrying forward those traditions through time, shaping them, passing them on, and creating memories that ground us in who we are. It’s slowing the clock enough to appreciate the passage of time, without trying to stop it entirely. Stay strong, stay curious, and breathe, Robin ✨One more thing… In the mad dash to check off everyone your gift list, don’t forget yourself. Give yourself the gift of knowing what your labs actually mean and getting help from a doctor. BYO labs or add on PH longevity labs to the visit (both FSA/HSA eligible!). Here’s to a healthier, more informed, 2026! Keep Reading Chronological vs. Biological Age: Which One Really Matters? How to reduce stress in 15-minutes Neuroplasticity and the “New Year, New You” Craze Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Before You Set Any 2026 Health Goals, Read This
URL: https://www.robinberzinmd.com/before-you-set-any-2026-health-goals-read-this/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: If there’s one thing I’ve doubled down on this year, it’s that health is a practice. Here’s how that’s shaping my health goals for 2026.
Plus, the 5 health practices I’m bringing into 2026. Robin’s Short Version One Metric Rule: Pick a single biomarker as your anchor—fasting insulin, VO2 max, or cortisol—set a January baseline, then retest in June. Estrogen and Aging: When estrogen drops, women lose up to 20% of bone mass and their Alzheimer’s risk doubles—start the HRT conversation early. Muscle Over Weight: Women lose 3–5% of muscle mass per decade; maintaining over 70% lean muscle mass is a stronger longevity predictor than body weight. This has been an incredible year for the RBMD community. When I relaunched this newsletter in the spring—with a clearer structure, a sharper focus, and a renewed sense of purpose—it was because I felt a shift. I started asking a different set of questions: What research is truly actionable? What metrics matter most for longevity? And how can I use my voice as a doctor—and as a woman in midlife—to help others navigate this with clarity and confidence? This has been my guiding light. And the way this community has grown by the thousands tells me it’s resonating. Hearing how you’ve applied these protocols in your own routines, shared them in your group chats, and used them to advocate for your health has been one of the most meaningful parts of my year. I’ve always lived the medicine I practice but in 2025, that took on new depth. I was diagnosed with osteopenia on my full-body DEXA. I started topical estrogen. I tracked my biomarkers more rigorously through Parsley’s Longevity Labs. I committed to consistent strength training and upgraded my supplement stack. This newsletter has been the place where I get to dive in with you—where I get to be both doctor and patient, teacher and peer. After a decade wearing the CEO hat at Parsley, this is the version of my work that feels especially alive. Thank you for being here. I’m so excited for what’s coming in this space in 2026! ⚡Forward this protocol The foolproof way to be healthier in 2026: Choose an anchor metric. If you’ve dropped resolutions by February (no shame, most of us have), this is your reframe: Choose a single biomarker or biometric to build your habits around. Want more energy? → Choose sleep consistency . Want better metabolism? → Choose fasting insulin . Want to improve your healthspan? → Choose biological age . Want to improve your lifespan? → Choose VO2 max . Want less belly fat? → Choose cortisol . Set your baseline in January. Re-test in June. Build your habits around moving that number in the right direction. 🤓 What we learned: Longevity isn’t about doing everything; it’s about doing the right things. After a year of digging through research, labs, news and real-world patient data, these are the longevity truths that rose above the noise for me. Estrogen is a longevity hormone. When it drops, women lose 10–20% of their bone mass, metabolic health declines, and Alzheimer’s risk doubles, making estrogen one of the most protective molecules in the female body. As women we should be having an informed conversion with our provider about HRT as early as possible. I believe proactive HRT is the future. My HRT protocol here . Body composition matters way more than weight. Throw away your scale and get a DEXA. The most important predictor of metabolic health isn’t weight, it’s lean muscle mass. Women lose 3-5% of their total muscle mass per decade starting in their 30s. Those who are able to maintain > 70% lean muscle mass live longer. Build lean muscle mass here . Low testosterone = low vitality. Suboptimal T in women often shows up as low libido, poor muscle retention, and sluggish metabolism. Correcting it can meaningfully improve mood, body composition, and energy. My case for (thoughtfully!) adding testosterone to your HRT here . Metabolic inflexibility is the secret driver of our weight gain and fatigue. If your body can’t easily switch between carbs and fat for fuel, everything feels harder. Unfortunately modern life is a set up for metabolic inflexibility. Zone 2 training, protein distribution, and lowering glucose variability are the quickest ways to rebuild metabolic flexibility and increase energy durability. Retrain your metabolism here . Start measuring heart health at 25. Yes, 25! Heart disease is slow-moving, largely preventable, and in many cases, reversible. Yet it’s still the #1 killer of women—and nearly half of American adults have some form of cardiovascular disease ( Circulation , 2019). Lowering ApoB early is one of the most powerful interventions for long-term cardiovascular protection. Track optimal cardiovascular health here . Biological age > chronological age. You have more than one age. DNA methylation tests are the gold standard for biological aging, but your fitness age (VO₂ max) and lab age (inflammation, glucose, insulin) often reveal the earliest shifts in your health, while they’re still easily modifiable. Measure and lower your biological age here . There’s a right—and a wrong—way to use ChatGPT for medical advice. Overall ChatGPT is 72% accurate at dispensing medical advice. But AI is only as good as your prompt—if you’re not a doctor, you might not know what you’re leaving out. Use AI to make you a smarter patient and optimize your care here . Most “health” bars are gut-disrupting sugar bombs. 55% of calories now come from ultra-processed foods—and a lot of the protein bars on the market are no better than candy. Look for <10g sugar, 4g+ fiber, and clean protein, or skip the aisle altogether. Actually healthy go-to bars here . Fasting IS for women—if done right. Fasting triggers autophagy—the body’s cellular cleanup system—but women need a specific strategy. The sweet spot: a 16-hour fast and 30g protein to break it, which supports longevity without compromising hormones. My fasting protocol for women here . Women live longer but spend 12 more years in poor health. Estrogen loss, muscle loss, metabolic decline, and toxins create a perfect storm. But health is a practice and the choices you make now matter—body composition, protein timing, stress resilience are the fastest ways to reverse aging velocity. My favorite protocols for women’s longevity here . 💪What to do: The 5 health practices I’m leaning into in 2026. If there’s one thing I’ve doubled down on this year, one mantra that’s inspiring my own health journey more than anything else, it’s that health is a practice . Here are five practices I’m taking with me into the new year: 🚶1. Japanese walking to hit my Zone 2 targets. I wrote about Japanese Walking—aka HIIT walking—back in July and it’s totally changed my feelings about cardio. Brisk power walking intervals are better at building muscle than walking at a steady pace, so this is one workout that is helping me meet my Zone 2 and lean muscle mass goals. Try it: 3 min fast, 3 min slow for 30-60 min, lowers BP and builds muscle vs. walking at a steady pace. 🌀 2. Breathwork is a powerful way to achieve calm and clarity. I’ve written a lot about how devoted I am to my meditation practice. (Every day, even if there’s a kid climbing on top of me, no excuses.) This year I got deeper into breathwork techniques like cyclic sighing , which outperforms meditation and box breathing for immediate stress reduction ( Cell Reports Medicine , 2023). Try it for 1 minute: Inhale through your nose Take a second, shorter inhale Long, slow exhale through your mouth Repeat 5–10 times 🏋️ 3. 3x per week strength training to turn 2% of my fat to muscle. I started paying much closer attention to my lean muscle mass this year. Women over 65 with low muscle mass are 63 times more likely to die early than their stronger counterparts ( Journal of Bone and Mineral Research , 2019)—time to get my butt in gear! I started working with a trainer 3x per week (Lots of reverse lunges, goblet squats, and single arm rows!) with the goal of increasing my muscle mass by 2%. Will report back on my progress early next year! 💊 4. Supplementing with urolithin A and sulforaphane. I care a lot about making sure people are getting the right supplements—vetted, evidenced-backed, bioavailable. If you haven’t gotten my full women’s longevity supplement stack yet, refer two friends to RBMD right now and I’ll deliver it to your inbox! The two new supplements I added to my personal stack this year: Urolithin A for mitochondrial support Sulforophane to support detox pathways. 🍫 5. An actually healthy protein bar. Of all the topics I get asked about as a functional medicine physician and longevity expert, one of the most frequent this year was protein bars. It inspired me to do a deep dive and find options that 1) aren’t loaded with crap 2) will help me meet my new protein goals and 3) actually taste good. My top pick if you can tolerate dairy: Jacob Beef Tallow Protein Bar . Dairy-free? Immortal Vegan Protein Bar . 💛 The Momgevity Files The new year is a time of deep reflection for me. I’m not into big parties—quite the opposite. For the past three years, my husband, three friends (one couple and one single friend), and I have done a pretty intense two-day New Year’s reflection exercise. We use a template from SY Partners as our pre-work. Part one is about looking back at our calendars in detail—how we spent our money and our time (and with whom); our peak moments and our lows; what we set out to achieve versus what we actually achieved; our surprises and curveballs. Part two is about looking ahead: what we’re committed to doing and achieving in the coming year—across career, love, money, health, experiences, relationships, and bucket lists. We go to one of our houses, make lots of delicious food and great coffee, and block off at least five hours each day for the work. We share out loud. We push each other and hold space for each other. There are tears, there are revelations, and there is accountability. It’s a beautiful practice, and each year at the end, I feel positively ready for the year ahead—clear, focused, and aligned. The group checks in a few times a year after that. Our group chat is called “Arrival.” I don’t set New Year’s resolutions. For me, a one-off goal sets me up for failure. My life isn’t about a “dry January” or a number on the scale (or even the DEXA scan). It’s about stepping up to live the life of my dreams. This year’s New Year’s work follows a recent solo visioning trip to Santa Fe. The next 10 years won’t be a repeat of the last—they’re going to be even better. I’m excited to see Parsley expand into its next phase of growth and to lean into sharing my voice with the world in a bigger way. This newsletter has been the kickoff for that expansion. It’s a passion project that’s allowed me to dive deep into the science of functional medicine and healthspan in a way that’s both deeply personal and meant to be shared. I’ve always lived the medicine I practice, but this year took it to a new level—especially around data. I’ve been wearing my Whoop, tracking my labs with Parsley even more religiously, and focusing on body composition. It’s also been about consciously letting go of old limits—on who I get to be and how I show up in my life. I’m learning how to be what others need without abandoning myself—something that’s come into clearer focus now that my youngest is four and we’re officially out of babyland. Each life phase brings its own realizations. For me, 2026 is all about health as a practice. I’m here to stop the clock (or at least slow it) without stopping my life. Because to me, longevity isn’t just about living longer—it’s about becoming more fully embodied and realized, a little more each day. Stay strong, stay curious and breathe, Robin ✨One more thing… Need a last minute gift? Use code PH150 for $150 off our clinical care program . Bonus: it’s a great way to use your FSA funds before they expire on Dec 31! Keep Reading Chronological vs. Biological Age: Which One Really Matters? 100 Essential Labs Every Woman Should Be Tracking Your comprehensive preventative health checklist. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## If You Only Fix One Thing for Longevity, Make It Your Mitochondria.
URL: https://www.robinberzinmd.com/mitochondira-for-longevity/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Mitochondria are the powerhouses of the cells. They’re also the biological foundation of aging. When they’re thriving, you’re thriving.
Your heart, bones, brain, and metabolism all age through the same bottleneck. Robin’s Short Version One MET, Big Impact: Raising your VO₂ max by just 1 MET is linked to a 10–20% drop in all-cause mortality. The Common Root: Mitochondrial dysfunction simultaneously drives insulin resistance, visceral fat, hormonal decline, and cardiovascular disease. The Weekly Formula: Do 3–5 Zone 2 sessions plus 1–2 interval sessions of 4×4 minutes at 90–95% max heart rate. Happy 2026! Last year was a big one for me personally and professionally. What came out the other side was a crystal-clear theme for this year: Embracing health as a practice so I can slow the clock—without slowing down my life. Here’s what I’m focusing on: 🏋️‍♀️ Building muscle: Convert 2% fat mass for lean mass with 3x/week strength training and 80+ grams protein daily. 🦴 Reversing the osteopenia in my hips: I just started taking Bondia , a next-gen probiotic that reduced hip bone loss by 74% in clinical trials. (Use code BERZIN for 20% off!) ❤️ Boosting VO₂ max: I’m committed to lowering my Whoop biological age to beat my real age—this means more Zone 2 (and yes, Zone 3 and 4) than I’ve been doing. 🧬 Assessing hormone support: I’m continuing topical estrogen for skin health, and testing my hormones twice a year via Parsley to time HRT properly—this might be the year. 🌟 Regenerative beauty: I’m leaning into skin longevity—liquid microneedling, topical peptides, high-dose vitamin A. 🧪 Preventing disease: I’m turning 45, so it’s colonoscopy time. I’m also exploring more advanced testing like Galleri by Grail, the multi-cancer early detection test (available via Parsley). 🧘‍♀️ Evolveing spiritually: I really upped my spiritual practice in 2025 with daily meditation, a new coach who has helped me be an “F yes!” to what is, psychedelic work, breathwork, and retreats. I plan to continue this work in 2026 and you can join me— my first Female Longevity Retreat is happening in Topanga, CA in June! So, what is going to power all this work? One word: mitochondria. You might remember from seventh grade biology class mitochondria are the powerhouses of the cells. But these little organelles do more than make ATP. They’re: Regulators of inflammation Directors of hormone signaling Core players in immunity and repair Early drivers of aging velocity When they’re thriving, you thrive. When they’re struggling, you get: Fatigue and brain fog Insulin resistance and weight gain Hormonal dysfunction Faster aging This is why I’m kicking off 2026 with a deep dive on mitochondria. Fix your mitochondrial dysfunction and you’ll improve every pillar of your healthspan and longevity. Let’s do it! ⚡Forward this protocol If you want more energy and higher power mitochondria, invest in this one habit: consistent cardio. VO₂ max is a direct readout of mitochondrial density and efficiency. Increasing your VO₂ max by just 1 MET (≈3.5 mL/kg/min) is associated with a 10–20% reduction in all-cause mortality ( Circulation , 2013). How to actually do this: 3–5 sessions/week of Zone 2 cardio (30–60 minutes; 60-70% of your max effort) 1–2 sessions/week of VO₂ max intervals (4 × 4 minutes at 90–95% max HR; 3 minutes easy recovery) 🤓 What to know: Mitochondria sit at the center of aging and are the biological foundation of energy. Mitochondria (99.9% of which we get from our moms—longevity starts in the womb!) = the biological foundation of energy. They also regulate: ♥️ Cardiovascular health Mitochondrial dysfunction → Reduced cardiac output, vascular stiffness. Why it matters: Mitochondrial efficiency may be a more powerful predictor of CVD and mortality than cholesterol ( European Heart Journal , 2017). 🦴 Bone density & fracture risk Mitochondrial dysfunction → Less bone formation, more oxidative stress Why it matters: Estrogen protects bone in part by protecting mitochondrial function—hence rapid bone loss in menopause. 🏃 Metabolic health & insulin sensitivity Mitochondrial dysfunction → insulin resistance, visceral fat gain Why it matters: Mitochondrial dysfunction sits upstream of prediabetes, metabolic syndrome ( Frontiers in Endocrinology , 2024). 🧠 Brain aging & cognitive health Mitochondrial dysfunction → lowers ATP availability, increases oxidative stress, impairs synaptic signaling Why it matters: Mitochondrial dysfunction is implicated early in Alzheimer’s and cognitive decline ( International Journal of Molecular Sciences , 2021). So, why do some 70-year-olds outperform 30-year-olds? ✨ When mitochondria are resilient, cells adapt and repair → aging slows. ❌ When mitochondria are damaged or inefficient, cells compensate poorly → aging accelerates. In other words: energy decline isn’t inevitable —it’s often lifestyle-induced. And you can change that. 💪What to do: Eat for metabolic flexibility, prioritize sleep consistency, ramp up VO2 max training. 🥩 Step 1: Eat protein-forward meals to fuel mitochondria and stabilize glucose. Mitochondria are protein-dense organelles. Inadequate protein → inadequate function. Aim for ~25–35g protein per meal to reduce glucose spikes and fuel repair. 😴 Step 2: Prioritize sleep consistency. Mitochondrial biogenesis is circadian-regulated. Even 1–2 hour swings in sleep timing disrupt mitochondrial repair and renewal. Consistency beats perfection. 💪 Step 3: Build mitochondrial capacity through exercise. Most effective workouts for mitochondria: Zone 2 aerobic work → increases mitochondrial density VO₂ max training → improves mitochondrial efficiency Resistance training → protects muscle mitochondria 🍷 Step 4: Reduce damage from alcohol and excessive seed oils. Cut alcohol. Even moderate drinking increases oxidative stress and damages mitochondrial membranes—especially in the brain, heart, and liver. Target a 2:1 omega-3 to omega-6 ratio. Excess omega-6s (like linoleic acid in seed oils) create oxidized metabolites (OXLAMs) that damage mitochondria and raise disease risk. 🔁 Step 5: Treat hormonal transitions. Estrogen, thyroid, and testosterone all impact mitochondrial function. Emerging research suggests estrogen therapy may directly improve mitochondrial efficiency and resilience ( Frontiers in Aging Neuroscience , 2018). 💊 Step 6: Support with mitochondria-friendly supplements. Supplements cannot override poor sleep, no exercise, or chronic stress. But hey can help support the protocols above. My go-to mitochondria stack: Magnesium glycinate Urolithin A CoQ10 Creatine 💛 The Momgevity Files It’s the first full week of the new year, and I’m emerging from the holiday break fog into all systems go. According to the Chinese Lunar calendar, 2025 was the Year of the Snake—a time for shedding old skins, patterns, people, roles, and stories—and WOW, was it ever. I deeply feel that a cycle has closed. At 44, I’m entering a new phase of life, more grounded in who I am than ever. But it took some real work to get here. Every New Year, a group of friends, my husband, and I do a two-day reflection and goal-setting exercise. It’s honestly one of my favorite things to do. We go deep as a group, pushing each other to dream bigger, questioning when someone’s taking on too much, and even asking: Is that what you really want? Doing this alone is powerful, but doing it in community takes it to another level. This was our fourth year doing it together, and we could truly reflect back to each other how far we’ve come. We’ve witnessed one another in both hard years and high years. It’s a beautiful mirror. We use the SY Partners New Year’s Reflection workbook, which starts with a detailed calendar review of the past year. That part is always eye-opening—I’m often surprised by how I actually spend my time. This year, I’m making a big commitment to shifting both where my energy and my hours go, as I transition into this next phase. One thing I felt really proud of, looking back, was how much I leaned into health as a practice—a mantra that organically emerged by year’s end. I added weight training and a new trainer to my routine in 2025, alongside yoga and Pilates. I also did in-depth testing, including a full-body DEXA scan that revealed hip osteopenia I hadn’t known about, and a full-body MRI with Prenuvo (via Parsley) that showed a few thyroid nodules had cleared (though one still needs monitoring). In 2025, I also committed to taking a few days off each month for health and spiritual practice—and when I reviewed the year, I’d followed through 8 out of 12 months. I’m SO proud of that. For example: A yoga retreat in Topanga (March) A breathwork retreat in Tulum (April) One-on-one psychedelic work with a practitioner I trust (May) Couples work with an extraordinary therapist trained in encounter-centered therapy (July) Burning Man (August), which always clears my head A solo visioning trip to Santa Fe (November) Some of these lasted a few hours, others a few days. Some were local (NYC), some involved travel. Throughout it all, I continued fine-tuning my supplements, increasing my protein intake, and tracking my wellness data more closely using Whoop. The outcome? All of this practice wasn’t about navel-gazing or self-perfecting. It gave me the capacity to show up as the mother, partner, friend, and leader I want to be. I got clearer on my needs and better at expressing them calmly and clearly. I got better at setting boundaries. And I didn’t just feel good, I felt beautiful in my own skin. I don’t think I’ve ever looked or felt better. Health is a practice. It lives in the choices we make every day—in how we connect to ourselves and value how we feel. It’s what enables us to live our story in full. To me, that’s real longevity. Stay strong stay curious and breathe, R ✨One more thing… This June I’m co-hosting an exclusive retreat in California! Body Lab: A Female Healthspan Immersion , with my co-host acclaimed yoga and breathwork teacher Schuyler Grant, is a highly curated, limited-spot experience for women who want to build strength, optimize hormones, and future-proof their energy from the inside out. Spots are filling up fast—I want to see you there! Keep Reading How Much Does Vigorous Exercise Really Matter? VO₂ max: If you only track one number for healthspan, make it this one Chronological vs. Biological Age: Which One Really Matters? Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## How Much Does Vigorous Exercise Really Matter?
URL: https://www.robinberzinmd.com/vigorous-exercise-vs-moderate-intensity/
Updated: 2026-02-28 · Topics: Longevity & Metabolic Health
Summary: Just 10 minutes of vigorous exercise may provide equal—or better—longevity benefits than an hour of low-intensity exercise.
Is 10 minutes of hard effort better than an hour of moderate intensity exercise? Robin’s Short Version New Conversion Rate: Wearables data shows 1 minute of vigorous effort equals 6.6 minutes of moderate exercise for reducing disease risk—not the 2:1 ratio public health guidelines used for years. The VILPA Protocol: Just 3–6 bursts of 30–90 seconds of vigorous movement daily cuts mortality risk, but only if you’re too breathless to hold a conversation. Zone 2’s Blind Spot: Moderate exercise builds mitochondrial health and fat oxidation, but requires far more time to match the disease protection delivered by short, intense effort. 1 minute of vigorous exercise = ~ 6 minutes of moderate effort. Back in 2004, I ran a marathon. I clocked a solid 4-hour finish…and promptly swore off long-distance cardio forever. Since then, I’ve leaned into yoga, pilates, and (my recent favorite) HIIT walking hoping that was enough exercise to deliver me to the longevity promised land. Last year, my WHOOP gave me a little reality check: My biological age came back two years older than my actual age mostly due to my lack of strength training and reluctance to do any exercise that gets my heart rate above Zone 1. I added 3x/week strength work and started aiming for more Zone 2 heart rate time. I thought I was on track… Then a new study dropped. And it stopped me in my (slow moving) tracks. According to wearable-based research ( Nature , 2025), just 10 minutes of vigorous movement may provide equal—or better—longevity benefits than an hour of low-intensity exercise when it comes to reducing risk of heart disease, diabetes, and early death . No marathons. No hour-long sweatfests. Just hard effort in short, sharp bursts. For someone whose biggest constraint is time, I’ve decided to make this my guiding exercise light leading into 2026. This week, I’m diving into the value of short and intense vs long and steady workouts and how to build both into your real life without burning out. 💡Forward this protocol Studies on VILPA (Vigorous Intermittent Lifestyle Physical Activity) show micro-bursts of effort— “exercise snacks”—are linked to lower all-cause mortality, reduced cardiovascular disease risk and improved metabolic health… even in people who don’t “exercise” otherwise . The Exercise Snacks Protocol (VILPA): 3–6 short bursts of vigorous movement per day Each burst: 30–90 seconds Total time: 3–10 minutes/day Effort level: breathing hard, heart pounding, can’t talk What counts: Sprinting up stairs Carrying heavy groceries fast Chasing kids at full speed Bike sprints 10–20 bodyweight squats done hard A short hill or treadmill incline push The key rule: 👉 If you can talk, it doesn’t count. 👉 If it feels slightly awful, you’re doing it right. 🤓 What to know: Intensity matters more than we thought. ❌ The old rule: 1 minute of vigorous activity = 2 minutes of moderate activity. That’s what public health guidelines used for years. But that formula was based on calories burned, not disease prevention. ✅ The new reality: 1 minute of vigorous effort = 6.6 minutes of moderate exercise. In the largest wearable-data study to date (not self-reported logs), researchers found intense movement reduced risk of: Early death (all-cause mortality) Cardiovascular disease Type 2 diabetes 💥 Vigorous activity delivered more health per minute—full stop. 🏃 Zone 2 is valuable—but inefficient for risk reduction Moderate, steady exercise (Zone 2) absolutely supports: Mitochondrial health Aerobic capacity Fat oxidation Recovery and metabolic flexibility But when it comes to reducing disease risk and death , it requires much more time to deliver the same protection as vigorous effort. ⏱️ Short “micro-bursts” count—and they count a lot One of the really interesting insights of this study: wearables capture intense movement people don’t remember or log. Think: Sprinting up stairs Carrying heavy groceries Chasing kids Rushing for a train These brief spikes may be some of the most protective minutes of the day. ✅ Ideally, you get both moderate and high intensity exercise The results of this study don’t negate the effects of zone 2 cardio and strength training. It’s not an either/or question but a case of both/and: Zone 2 builds the foundation (mitochondria, endurance, recovery). Vigorous effort drives the biggest longevity returns per minute. The bottom line: If time is limited a short, intense workout may be one of the most powerful health investments you can make. 💪 What to do: Prioritize high intensity exercise but keep a foundation of moderate effort. If you want the biggest longevity payoff—with the least time—you need both short bursts of intensity and longer, steady work. Here’s how to structure it. Step 1: Prioritize vigorous exercise (2–3x per week) Vigorous = heart rate at ~85–95% of max, breathing hard 10–20 total minutes of vigorous effort per session Step 2: Layer in Zone 2 for metabolic health (2–4x per week) Zone 2 = 60-70% of max heart rate, can still hold a conversation 30–60 minutes per session Examples: Brisk walking, easy jogging, cycling, incline treadmill, rucking with light weight Step 3: Strength train 2–3x per week (especially for women) Muscle is a longevity organ → Preserves insulin sensitivity, protects bone density, lowers fall and fracture risk, buffers against muscle loss during peri/menopause Focus on: Squats Deadlifts Pushes Pulls Carries 👉 Keep it heavy enough to feel challenging by the last 2–3 reps. Step 4: Stop discounting “micro-bouts” of exercise This is where the new research goes from being intimidating to inspiring for me: Sprinting up the stairs to my office rather than taking the elevator, carrying a kid up to bed at night, pushing myself to lift hard for a short bust at the gym all counts. These moments may deliver outsized benefits even if they’re unplanned. 💛 The Momgevity Files I set some big goals for 2026 during my annual New Year’s visioning exercise (see my last newsletter for how to do it yourself!). One of those goals was to lead my first health and wellness retreat in a beautiful place with friends—so I’m thrilled to share that it’s officially happening this June in Topanga, CA in partnership with my longtime yoga teacher and friend, Schuyler Grant, founder of Kula Yoga in NYC and the online health platform Commune. Schuyler’s retreat spot in Topanga is magical. The views over the mountains, the house—formerly owned by Daryl Hannah, where Neil Young wrote Heart of Gold . It’s the ultimate longevity-nerd setup with a cold plunge, sauna, and hiking trails…it’s a dream. And it’s a dream for me to teach alongside one of my earliest teachers. I met Schuyler when I stumbled into her yoga studio at 22, fresh out of college and working near FiDi, where the original Kula was located. I wasn’t a wellness person back then. To be honest, yoga felt foreign and kind of weird. The Om’ing, the spiritual talk, the Sanskrit pose names—all of it felt silly at first. But through the sweat, the flow, the breath of her classes (and the other incredible teachers there), I discovered something unexpected: a sense of groundedness, presence, and clarity I hadn’t felt as a hyper-competitive, over-achieving college student. And, maybe more importantly, I found a genuine love for health. Those classes planted the seed for everything that followed. My passion for helping others transform their health started there, and eventually led me to medical school at Columbia, and later into functional medicine and the science of longevity. “One often meets her destiny on the road she took to avoid it.” In those days, I was avoiding a very boring job as a paralegal and I had no idea that sneaking out to yoga on my lunch breaks would change my life or inspire my career. Through yoga—and learning to listen to my body with a little more compassion—I also got interested in food. Real food. I started eating to feel good now and in the future, instead of eating to be skinny, which had been my college-girl version of “nutrition.” So it felt gratifying this week when—for once—the government did something positive for public health: it released a new version of the food pyramid. While it’s not perfect ( see my reel for a deeper dive), it reflects modern nutrition science, much of what the functional medicine community has been saying for decades, and what we’ve seen hold true in clinical practice across nearly 50,000 patients at Parsley. Food is medicine. And by eliminating added sugar, ultra-processed foods, common allergens and additives; by prioritizing protein to build lean muscle and stabilize metabolism; and by eating plenty of fiber- and phytonutrient-rich whole grains, nuts, seeds, vegetables, fruits, and healthy fats—the body can often heal itself. At Parsley, a personalized nutrition plan is the first prescription we offer for good reason: it works. Not every problem can be solved by food alone, but the vast majority of both physical and mental health issues improve when we eat this way. What I learned in my early days on the mat—and again in medical training—is that health happens in the 99% of our lives when we’re not in a doctor’s office. It’s a daily practice, shaped by what we eat, how we rest, how we move, how we connect to nature, and how we choose to pause. So as you think about your own longevity, I hope both my retreat and the new food pyramid serve as reminders or inspiration: Choose one thing this year you’ll commit to changing or doing—something that helps you heal from the inside out. Stay strong, stay curious, remember to breathe, Robin ⚡One more thing… I am in serious get sh*t done mode this month. One of the easiest things I checked of my to-do list: my annual longevity labs with Parsley. Book yours here or BYO labs and book a consult with a Parsley clinician for advanced analysis and a personalized treatment plan! Keep Reading VO₂ max: If you only track one number for healthspan, make it this one Forget Weight—Muscle Mass Is the Real Longevity Metric. If You Only Fix One Thing for Longevity, Make It Your Mitochondria. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Fertility Over 35: 8 Evidence-Backed Levers
URL: https://www.robinberzinmd.com/fertility-over-35-protocol/
Updated: 2026-02-28 · Topics: Fertility & Parenting
Summary: I’ve identified 8 evidence-backed fertility levers for women over 35 — blood sugar, thyroid, stress, autoimmunity, toxins, and more — that most OBs never
I’ll be honest: when I first saw that stat , I was shocked. Maybe because I grew up in the ’80s and ’90s—when teen pregnancy was framed as the crisis, and fertility after 35 was barely mentioned, let alone supported. Robin’s Short Version Blood Sugar First: Even mild insulin resistance—before diabetes—disrupts ovulation, lowers progesterone, and raises miscarriage risk, even in women with normal cycles and a healthy BMI. Post-Meal Walks Work: Walking just 10–15 minutes after eating pulls glucose from the blood directly into muscles, making it one of the fastest ways to stabilize blood sugar. TSH Isn’t Enough: A “normal” TSH above ~2.0 can still impair fertility—a complete picture requires Free T4, Free T3, Anti-TPO, and Anti-thyroglobulin antibody testing. When I graduated from med school at Columbia in 2011, IVF was just becoming mainstream and I began to see patients dealing with infertility and impaired fertility. I quickly realized that conventional medicine offered them two choices: Wait until you hit the 12-month mark of trying Or go straight to IVF Both options skipped right over why fertility might be impaired in the first place. Now, after helping thousands of women get pregnant—naturally and via IVF—I can confidently say: Fertility isn’t a black box. It’s a system. And it’s modifiable. Age matters. But it’s far from the whole story. I got pregnant for the first time just shy of 35, and went on to have three full-term, healthy pregnancies between 35 and 40—with no interventions. Yes, that’s anecdotal—but it mirrors what I see daily in my clinical practice at Parsley Health. Yes—there are factors we can’t control. And that reality deserves honesty and compassion. But there is also so much that is in our control—the healthcare system has largely failed to address the root drivers of declining fertility or to help women optimize the terrain before they ever reach a fertility clinic. So let’s talk about the levers most doctors still aren’t pulling. ⚡️ Forward this protocol If you only do one thing to optimize fertility over 35, do this: 🩸 Test and stabilize your blood sugar. Even mild insulin resistance—before diabetes—disrupts ovulation, lowers progesterone, impairs egg quality, and increases miscarriage risk. This is true even in women with “normal” cycles and a healthy BMI. The 4-week blood sugar reset: Eat 30–40g protein at breakfast (skipping this worsens glucose spikes throughout the day) Eliminate ultra-processed carbs and added sugar Walk for 10–15 minutes after meals (pulls glucose from the blood into muscles) Lift weights 2–3x/week to improve insulin sensitivity and “sink” glucose into muscles Protect sleep (poor sleep raises insulin resistance within days) Blood sugar is one of the fastest, most measurable fertility levers we have—and improving it often unlocks everything else. 🤓 What to know: Fertility over 35 is more modifiable than you’ve been taught. Fertility isn’t just a reproductive issue—it’s a whole-body process. Ovulation, implantation, and early pregnancy depend on finely tuned signals between your brain, ovaries, thyroid, immune system, and metabolism. In my practice, these are the most overlooked—but modifiable—drivers of impaired fertility: 🧁 Blood sugar & metabolic health Even in women without diabetes, subclinical insulin resistance is associated with irregular cycles, anovulation, and miscarriage risk ( Human Reproduction , 2024). Insulin resistance affects fertility through several pathways: Impaired ovulation and follicle development ( Lancet Diabetes Endocrinology , 2020) Oxidative damage to egg quality ( Human Reproduction , 2012) Endometrial disruption that contributes to implantation failure ( PLoS One , 2017) 🌀 Thyroid function Thyroid hormones act as master regulators of reproduction. They influence: Ovulation timing Luteal phase adequacy Implantation Placental development 👉 Overt hypothyroidism is associated with menstrual irregularities and infertility ( Thyroid , 2017). 👉 Untreated hypothyroidism disrupts ovulation, causes infertility, and increases miscarriage risk ( JAMA , 2025). 👉 Thyroid autoantibodies are associated with diminished ovarian reserve and increased miscarriage risk ( Seminars in Reproductive Medicine , 2024). 🔥 Chronic inflammation Chronic, low-grade inflammation interferes with fertility at multiple levels. Unlike acute inflammation, this type often flies under the radar, creating a systemic inflammatory state that directly compromises reproductive processes: Inflammatory cytokines disrupt folliculogenesis, reduce oocyte quality through oxidative stress, and interfere with hormone production ( Reproduction , 2025). “Leaky gut” may trigger ovarian inflammation and impair luteal phase ( Gynecological Endocrinology , 2015) Gut dysbiosis contributes to elevated estrogen levels, which can promote conditions like endometriosis ( International Journal of Molecular Sciences , 2024) ❌ Autoimmune activity Autoimmunity can impair fertility even in the absence of symptoms. (Women account for ~80% of autoimmune disease.) Promotes a chronic inflammatory environment that impairs implantation ( Journal of Clinical Medicine , 2024). Antiphospholipid antibodies (aPL) can cause pregnancy loss ( Clinical Immunology , 2011). 😧 Chronic stress & nervous system dysregulation Fertility requires safety, biologically speaking. Chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis, which can: Suppress ovulation ( Psychoneuroendocrinology , 2018) Chronic stress reduces progesterone through precursor competition—the so-called “cortisol steal” mechanism ( Comprehensive Physiology , 2025). Stress-induced progesterone deficiency leads to luteal phase insufficiency ( Epidemiology , 2015). 💪 What to do: 8 evidence-backed fertility levers to tackle now. ✅ 1. Optimize blood sugar Hemoglobin A1C: < 5.4% Fasting insulin: < 5 µIU/mL Fasting glucose: ~80 mg/dL ✅ 2. Test and treat thyroid conditions the right way Test beyond TSH: Free T4 Free T3 Anti-TPO antibodies Anti-thyroglobulin antibodies A TSH above ~2.0 may be considered “normal” by labs but can still impair fertility. Treatment often requires both medication and targeted nutrient repletion (iron, selenium, iodine, zinc). ✅ 3. Use cyclic progesterone to reset irregular cycles Women with PCOS, hypothyroidism, metabolic dysfunction, or chronic stress often have low or erratic progesterone. “Cyclic” progesterone—14 days on, 14 days off—can help: Normalize cycle length Improve luteal phase support Reduce estrogen dominance ⚠️This is very different from continuous progesterone and should be used thoughtfully with a clinician. ✅ 4. Eliminate food-driven inflammation A significant percentage of people have undiagnosed food sensitivities driving chronic inflammation—often without obvious GI symptoms. The most common culprits: Gluten Dairy Soy Eggs Corn Nightshades Tools like KBMO food sensitivity testing (which we use at Parsley) or blood-based allergy testing can help personalize this—rather than guessing forever. ✅ 5. Actively downshift your nervous system (this is not optional) Chronic stress can lead to “cortisol steal,” where progesterone is diverted to make more cortisol—directly impacting fertility. Your goal: 60 minutes per day in a parasympathetic-dominant state. That can look like: Walking Yoga Breathwork Cooking Meditation Gentle strength training Any non-screen, non-performance activity ✅ 6. Screen early for autoimmune activity Key labs to consider: ANA hs-CRP ESR Thyroid antibodies Identifying and calming immune activation early can be fertility-protective. ✅ 7. Reduce toxin exposure that disrupts hormones Many everyday chemicals are known endocrine disruptors which interfere with estrogen, progesterone, and thyroid signaling: Parabens Phthalates BPA / BPS PFAS Microplastics 👉️ Use the Environmental Working Group app for pregnancy-safe products 👉️ Filter drinking water (ideally reverse osmosis) 👉️ Prioritize fiber (30-50g) to help clear microplastics ✅ 8. Move your body—strategically Exercise is one of the most powerful tools we have to: Improve insulin sensitivity Balance hormones Reduce stress Normalize cycles The protocol: Strength training (2–3x/week) Yoga or mobility work (1-2x/week) Zone 2 cardio (brisk walking, cycling) 💛 The Momgevity Files This morning, my 4-year-old got in bed with me to snuggle. It’s a snow day here in NYC, and all three of my kids are home from school. As I cuddled with him and looked out at the gray sky, I couldn’t help but feel a pang of what I call pre-nostalgia —that sense of missing something from the perspective of the future, even though it’s still here now. Thinking back to when I had my first child and was starting Parsley Health, I remember fearing that kids would limit me—that they’d keep me from doing the things I wanted to do, or somehow cut off a part of myself I’d lose forever. What I’ve learned is that kids are part of the expansion: I became a mother and a CEO, a caretaker and a creator—a foundation for someone else’s life that, in its broadness, widened my ability to live a bigger version of my own. I wasn’t less for having kids. I became far more than I ever could have imagined. As crazy and overwhelming as this time of life feels sometimes—raising young kids, work in full steam, travel, partnership, social life all in motion—I keep coming back to this idea of expanding into more of myself, again and again. A mom friend recently asked how I find time to commit to a longevity routine, given how full life is. She was like, “I’m calling BS. How on earth do you actually lift weights, do Pilates, take supplements, meditate, work with a spirituality coach, sauna, and do any actual Zone 2?! Come ON.” She has a point. I don’t get to all of it, all the time, or every week. I went to yoga yesterday for the first time in two weeks, and my body was so grateful. I’d missed my mat terribly (it’s the spot where I really ground and tune in to myself), but my schedule simply hadn’t allowed it. And that’s okay. It all comes in waves. On the flip side, all of these practices are what allow me to expand. They’re how I sleep well, find energy, gain clarity and calm, and maintain resilience and stamina for a big life. Without them, I start to feel tired, foggy, bloated, anxious, and erratic. Longevity, for me, is about constantly becoming the best version of myself—challenging my assumptions of who I think I have to be, and listening to what I really want. The longevity practices I’m leaning into, then, aren’t just about long-term brain health or preserving muscle mass. They’re about fully living the life I have now —especially because these moments of snuggles with my little ones won’t last forever. Stay strong, stay curious and breathe, Robin ⚡️ One last thing… Optimizing your fertility at any age doesn’t have to be a DIY project. This is a core part of what we do at Parsley. We get referrals from IVF clinics all the time to help patients optimize their health and increase their likelihood of treatment. We have helped hundreds of women get pregnant! Learn more about our reproductive health program here . 👋 I’m Dr. Robin Berzin I’m a mom, wife, doctor, and CEO in my 40s. My goal is to be healthier than ever – and help you do the same. I’m also the founder of Parsley Health, the nation’s leading functional medicine clinic designed to help you reverse chronic disease and optimize your health. Join Parsley using RBMDCREW to save $100 on your membership. Keep Reading MTHFR mutations can cause anxiety, fatigue and fertility issues. You likely have one. 4 fasting for women strategies to optimize longevity. How to achieve optimal hormone balance, regardless of age Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Fix Your Metabolism to Improve Mental Health
URL: https://www.robinberzinmd.com/metabolism-mental-health-protocol/
Updated: 2026-02-28 · Topics: Brain, Mood & Nervous System
Summary: Learn how stabilizing blood sugar and reducing metabolic inflammation can improve anxiety, brain fog, and mood—faster than you might expect.
For decades, we’ve treated mental health like it starts and ends in the brain. But at Parsley, I see something different every single day. Robin’s Short Version Walk After Meals: A 10-minute post-meal walk can cut glucose spikes by ~30%, reducing inflammatory signals linked to anxiety and brain fog. Protein at Wakeup: Eating 30g of protein within an hour of waking blunts glucose spikes and supplies amino acids your brain needs to make neurotransmitters. Microglia Are Fixable: Reducing insulin resistance can shift your brain’s immune cells from inflammatory M1 mode to protective M2 mode, improving mood and cognition. Patients come in for gut issues, skin flares, hormone chaos—then quietly mention brain fog, anxiety, irritability, or low mood as a “side issue.” Then we stabilize blood sugar. We lower inflammation. We replete nutrients. And suddenly their mood improves. Sometimes dramatically. Parsley isn’t a psychiatry practice—but the brain is a metabolic organ. (A big part of my book State Change is about exactly this: how we can transform mood, anxiety, and depression through the body.) Lately, I’ve been deep in the emerging field of metabolic psychiatry, and it’s blowing the lid off what we thought we knew. From Alzheimer’s and Parkinson’s to ADHD and anxiety, new research shows that many neurological and psychiatric conditions may have a strong metabolic component. Take microglia, for example… Research shows when you reduce insulin resistance and improve metabolic health, you can shift microglia—your brain’s immune cells—from inflammatory “M1” mode back to protective “M2” mode ( Metabolic Brain Disease , 2025). That shift alone may meaningfully improve cognitive and mood-related symptoms in some people. This doesn’t replace therapy or medication. But it does explain why your metabolism can change how your brain feels and functions—sometimes faster than anything else. ⚡️ Forward this protocol If your brain feels anxious, foggy, or “on edge,” walk after you eat. This is less about clearing your mind and more about clearing inflammation. Post-meal blood sugar spikes trigger inflammatory signaling (NF-κB, cytokines) that can cross the blood–brain barrier and activate microglia—the brain’s immune cells—pushing them into an inflammatory state linked to anxiety, brain fog, and low mood. Walking for 10 minutes after your largest meal can lower post-meal glucose spikes by up to ~30%. 👉 If your mind feels calmer and clearer within a week, metabolism was part of the problem. 👉 If not, you still improved brain health with almost zero downside. 🤓 What to know: Your brain runs on metabolic fuel. Your brain uses ~20% of your body’s energy, even though it’s only ~2% of your body weight. When metabolism is off—unstable blood sugar, insulin resistance, chronic inflammation—the brain feels it first. Here’s what the science shows: 📈 Blood sugar spikes trigger inflammatory chemistry When you eat a high-glycemic meal (refined carbs, sugar, ultra-processed foods), blood glucose rises quickly. Your pancreas floods your system with insulin to pull glucose into cells. This spike → crash cycle does more than mess with your appetite. It triggers inflammation, even without chronic high blood sugar. Repeated glucose spikes: Increase reactive oxygen species (ROS) inside cells Activate NF-κB, a master inflammatory signaling pathway Increase circulating pro-inflammatory cytokines like IL-6 and TNF-α You don’t need chronic hyperglycemia to create inflammation—repeated swings are enough. 🔥 Systemic inflammation reaches the brain via the blood–brain barrier The brain is protected by the blood–brain barrier (BBB)—but it’s not impenetrable. Chronic metabolic inflammation: Increases BBB permeability Allows inflammatory cytokines to signal into the brain Activates immune signaling in brain tissue Even without immune cells crossing the barrier, cytokine signaling alone is enough to change brain function. 👊 Microglia respond by shifting into “attack mode” Microglia are the brain’s resident immune cells. They constantly monitor the environment. They exist on a spectrum, but are often simplified into two functional states: M2 (protective): repair, clean-up, neuroprotection M1 (inflammatory): threat response, cytokine release, synaptic pruning Chronic metabolic inflammation pushes microglia toward the M1 inflammatory phenotype. When microglia stay in this state too long, they: Release inflammatory mediators inside the brain Disrupt neurotransmitter signaling Interfere with synaptic plasticity (learning, memory, mood regulation) 😠 This directly affects mood, focus, and emotional regulation Neuroinflammation alters key brain systems involved in mental health: Serotonin & dopamine signaling (TK) BDNF (brain-derived neurotrophic factor, critical for mood and cognition) HPA axis regulation (stress response) This helps explain why people with unstable blood sugar often report: Anxiety that feels “wired” or physical, brain fog or slowed thinking and low motivation or flattened mood. 💪 What to do: Reduce neuroinflammation by fixing the metabolic inputs. This is not about willpower or “eating clean.” It’s about removing the metabolic signals that keep brain immune cells activated and replacing them with ones that restore balance. Step 1: Flatten glucose curves (not just “eat less sugar”) The shape of your glucose curve matters more than total carbs for neuroinflammation. Avoid: Spikes >140 mg/dL after meals Crashes <70 mg/dL within 2–3 hours How to do it (practically): Eat carbs last (protein → fat → fiber → carbs) Cap refined carbs at ≤30–40g per meal Pair all carbs with protein and fat Walk for 10–15 minutes after meals (reduces postprandial glucose by up to 30%) Step 2: Hit a protein floor—especially in the morning Skipping protein in the a.m. is one of the fastest ways to set off a glucose → anxiety cascade. Protein slows gastric emptying, reduces glucose spikes, provides amino acids for neurotransmitters, and improves insulin sensitivity. Non-negotiable target: 30g protein within 1 hour of waking Step 3: Replete magnesium (most brains are running low) Magnesium improves insulin signaling, dampens NMDA receptor overactivation (linked to anxiety) and reduces neuroinflammation. Actionable dose: 300–400 mg/day magnesium glycinate or threonate Step 4: Eat the rainbow to actively calm microglia. Certain phytonutrients directly suppress microglial activation and shift them toward the protective (M2) phenotype. High-impact additions: Omega-3s: 2–3 servings fatty fish/week or 1–2g EPA/DHA daily Curcumin: 500–1,000 mg/day (bioavailable form) Polyphenols: berries, olives, cacao, green tea 💛 The Momgevity Files This past week was an exercise in contrast therapy—but not exactly the sauna-to-cold-plunge kind. First, the warm part: I started off with a three-day trip with my YPO forum, a business group I’m part of, on our annual retreat. We chose to sail for a couple of days on catamarans in the British Virgin Islands. The boats were a lot less fancy than it sounds, but the setting was stunning. We spent a good part of our days swimming and catching up, but most of our time was in working sessions—including a personal values exercise, five-year goal setting, and workshopping the business and life challenges each of the seven of us are facing. We went deep. For me, one of the biggest takeaways was this: having a tried-and-true process for 90-day, annual, 3- and 5-year goal setting is one of the most powerful longevity tools I have. Where your eyes go, your car goes. Knowing where you want to head is essential for getting there. From there, it was a quick turnaround through the office before I headed upstate for the “cold” part of the week’s itinerary: a trip that turned into a 12-inch snowstorm. Not exactly the ideal setting for cleaning out a giant shipping container filled with 10 years of our stuff from our old house. My husband and I stood in the snow, sorting old toys and clothes and plates and books, slashing open boxes with pocket knives, and munching on GF pretzels alongside thermoses full of coffee. This was after our U-Haul got stuck in the snow— twice. (Don’t try to drive in that weather in one of those things, people!) After seven hours of sorting and handing things off to be junked, auctioned, or gifted to friends, backs sore and feeling way too frozen for more sledding sessions with the kids, I said goodbye to a phase of life. We’re parting ways with some land up there that, at one point, we had planned to build a house on. But for a lot of reasons, our vision shifted and our dreams turned elsewhere. It was a reminder: some dreams have to die for new ones to be born. Also a reminder: Make no small plans. And know that most of them will turn out. But some have a way of turning out for the best, just not in the way you planned. I’m a big believer that when you know your passions, operate from a set of core personal values, set big dreams, and chart the best path you know how, you’ll achieve a lot of them. Back in 2010 or so, during med school, I set a goal to be a leader in integrative medicine and health—and, well, here I am! I also set a goal of having a family, and as I watched my kids careening down the hill and having snowball fights, it dawned on me: I asked for this. I created it. Here we are. And yet, not sure if anyone else feels this too, but this seems like a moment—for me, and for a lot of people I’m hearing from—of shedding old selves (thanks, Year of the Wood Snake!) and opening the door for new ones. Another reminder: for things to change, they have to change. Part of longevity, I think—especially as women—is allowing ourselves to evolve, and become new iterations of who we are. The person you were at 24 is not the same person at 44 or 64. That can be scary—but it’s also the way we keep things interesting, alive, and full. We are continually expanding, if we do it right. And that’s what makes all the healthspan work—the estrogen, the weights, the supplements, the fiber—worth it. Stay strong, stay curious and breathe, Robin 👋 I’m Dr. Robin Berzin I’m a mom, wife, doctor, and CEO in my 40s. My goal is to be healthier than ever – and help you do the same. I’m also the founder of Parsley Health, the nation’s leading functional medicine clinic designed to help you reverse chronic disease and optimize your health. Join Parsley using RBMDCREW to save $100 on your membership. Keep Reading How to reduce stress in 15-minutes The best diet for brain health? Bloating and brain fog? You’re probably low in butyrate. Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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## Why GLP-1s Underperform Without Estrogen
URL: https://www.robinberzinmd.com/glp-1-hrt-hormone-connection/
Updated: 2026-02-28 · Topics: Women’s Health & Hormones
Summary: I had a patient gain 50 lbs in 6 months. GLP-1 alone did nothing. Adding HRT changed everything. Here’s the science behind why estrogen makes GLP-1s work.
A patient came to see me in her mid-40s. In six months, she’d gained 50 pounds. Not gradually. Rapidly. Like her metabolism had just stopped. Robin’s Short Version The Gap Is Real: Women combining HRT with tirzepatide lost 17% body weight vs. 14% alone — and were 2.5x more likely to hit ≥20% loss. Estrogen Amplifies the Drug: Estrogen upregulates GLP-1 receptors and boosts your body’s own GLP-1 production, so menopause directly weakens the drug’s effect. Test Before You Start: Check estrogen, progesterone, testosterone, LH, and FSH before beginning a GLP-1 — optimizing hormones may be what makes the treatment work. We checked thyroid. Lowered inflammation. Optimized diet and exercise. Even added a low-dose GLP-1. Nothing moved. What finally worked was HRT and semaglutide — together. Within months, she was losing weight for the first time in over a year. I thought about her when I saw new data on the combination of GLP-1s and HRT published in February 2026. What happened in her case is not coincidence. It’s biology. This week, I’m digging into why — and what it means for any woman in midlife who isn’t getting the metabolic results she expected. ⚡️ Forward this protocol If you’re a woman in mid-life on a GLP-1 — or considering one — here’s where to start: Get your hormone levels tested: estrogen, progesterone, testosterone, LH and FSH Assess for symptoms of perimenopause: including sleep changes, irritability, irregular periods, vaginal dryness Consider HRT alongside a GLP-1 — for many women, this combination outperforms either alone 👉 These aren’t separate decisions. For many women, optimizing hormone levels is what makes the metabolic treatment work. 🤓 What to know: Estrogen may be what makes GLP-1s actually work ❌ The old assumption: GLP-1s work the same in everyone. The pivotal GLP-1 trials — the ones generating the headline weight loss numbers — were run mostly in younger, premenopausal participants. Postmenopausal women weren’t well represented. So when a postmenopausal woman takes tirzepatide and loses less weight than expected, it’s often chalked up to age. Turns out, it may be her hormones. ✅ The new reality: without HRT, postmenopausal women lose significantly less weight on GLP-1s. With HRT, they match what younger women achieve in trials. A Mayo Clinic study in The Lancet [1] (2025) followed 400 postmenopausal women on tirzepatide for 12+ months: HRT + tirzepatide: 17% total body weight loss Tirzepatide alone: 14% or 35% less 45% of HRT users achieved ≥20% weight loss vs. only 18% of non-HRT users The same pattern appeared with semaglutide in Menopause [2] (2024) — greater weight loss at every checkpoint over 12 months. 💥 Two different GLP-1s. Same result. 🔬 Why: estrogen and GLP-1 share the same brain circuits. Estrogen upregulates GLP-1 receptors in the gut and brain. More receptors = stronger signal = more appetite suppression from the same dose. Estrogen also stimulates your intestinal cells to produce more of your own GLP-1 — so you’re starting from a higher baseline. And they activate the same downstream pathways in the liver, fat tissue, and pancreas. One plus one doesn’t equal two. It equals more. When estrogen drops in menopause, the efficiency of that entire system drops with it. 💪 What to do: Treat these as coordinated strategy, not separate decisions. Two things I want to be clear about before the protocol. GLP-1s are not for everyone. They’re most appropriate for women dealing with metabolic syndrome, insulin resistance, or weight gain that hasn’t responded to every other tool. Functional medicine means using the best tool for the job — sometimes that’s food and lifestyle, sometimes it’s a drug, sometimes it’s both. MHT (menopausal hormone therapy), on the other hand, I think of as one of the most powerful longevity tools we have for women — full stop. The data on cardiovascular protection, bone density, and cognitive health is beyond compelling, especially when started in perimenopause or close to menopause. We’ve moved well past the fear era of the early 2000s. Step 1: Test your hormone levels Don’t guess. Get a full panel — estrogen, progesterone, testosterone, FSH — plus a metabolic workup. At Parsley, this is the foundation before we make any metabolic recommendations. Step 2: If you’re starting HRT, earlier is better Research supports initiating MHT in perimenopause, or within 10 years of menopause onset, for the greatest protective effects on heart and brain. If you’re already postmenopausal and symptomatic, it’s still worth the conversation. Step 3: If you’re on a GLP-1 and underperforming — look at your hormones Women without HRT on tirzepatide lost below what clinical trials predict. If that sounds like your experience, your hormones may be the missing piece — not your effort, not your diet, not your willpower. Step 4: Protect your muscle regardless On a GLP-1, up to 40% of weight lost can be lean mass if you’re not actively protecting it. Strength training 2–3x/week and 80–100g+ protein daily are non-negotiable. 👉 The goal: hormonal health and metabolic health aren’t separate lanes. For many women, fixing one is what unlocks the other. 💛 The Momgevity Files Big birthdays and sculptural facials. February is always a big month for me. Two of my three kids have birthdays this month — and so does Parsley, which was in some ways my first baby. So if you count it, that’s 3 of my 4 kids’ birthdays. 🙂 This month, Parsley turned 10. My oldest turned 9. I honestly don’t feel old enough to have a 10-year-old company or a 9-year-old human child. But here we are. Maybe we all feel younger than we are. I feel about 39 — not almost 45. Physically, I’d say closer to 30 (that’s what my Parsley longevity labs tell me). Emotionally, I’ll take the extra decade. The wisdom I’ve gained over these 10 years — as a mother, as someone running a company, as a wife learning how to be a better wife, and through real spiritual growth — I wouldn’t give that up for anything. This week we’re on spring break in Costa Rica, where I had something called a “sculptural facial” — which is less a facial and more a deep face, neck, and shoulder massage with lymphatic drainage. The practitioner put on gloves and worked inside my mouth to release tension from my jaw and face from the inside out. When she was done, I looked in the mirror and genuinely couldn’t believe it. More awake. Eyes more open. Cheekbones higher. The lines in my forehead — gone. More than after any facial, Botox, or yoga class I’ve ever done. It was a reminder: how we look, feel, and experience aging is plastic. Progress isn’t linear. You can turn back the clock in surprising ways. Longevity isn’t about fighting aging. It’s about flowing with it — which means being grateful for the birthdays marking time, for the wisdom that comes with them, and for the tools keeping my cells, sinews, and collagen tracking about 10 years behind. I’ll take it all. Stay strong, stay curious and breathe, Robin ⚡️ One last thing… Wondering if your hormone levels are affecting your metabolism — or whether you’re a candidate for HRT, a GLP-1, or both? That’s exactly what we dig into at Parsley. Book your longevity labs here , or bring your own and book a consult with a Parsley clinician for a personalized treatment plan. Join Parsley using RBMDCREW to save $100 on your membership. Scientific References Faubion SS, et al. “Menopausal hormone therapy and tirzepatide for weight loss in postmenopausal women.” The Lancet , 2025. https://www.thelancet.com/journals/lanogw/article/PIIS3050-5038(25)00145-1/abstract Rupa Gopalan, et al. “Semaglutide and hormone therapy in postmenopausal women.” Menopause , 2024. https://pubmed.ncbi.nlm.nih.gov/38446869/ Originally published in the Off Script newsletter. Join 50,000+ readers for weekly functional medicine insights. As always, this newsletter is for informational and educational purposes only and is not intended as medical advice. Always consult your healthcare provider before making any health decisions or changes to your treatment plan.
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