Perimenopause Is the Inflection Point Breaking Women’s Health
One of the core problems in healthcare today is that modern medicine keeps confusing “normal” with “healthy.” Nowhere is that distinction more damaging than in the way we treat women at midlife. My recent conversation with Dr. Mayoni Gooneratne took that idea and landed it with the precision of someone who has seen the consequences play out on the operating table. You can watch the full episode here.
Dr. Mayoni is a London-trained former NHS colorectal and pelvic floor surgeon who walked away from the operating theater to build Human Health and co-found the British College of Functional Medicine, where she serves as vice-chair. She did not arrive at functional medicine through ideology. She arrived through two decades of watching women be failed by a system that optimized for surgical throughput but not for the slow, multifactorial cascades that were silently hollowing out her patients’ metabolic, cognitive, and cardiovascular health.
The Story That Changed Her
The single most memorable moment in our conversation was Mayoni describing her own mother — also a retired doctor. Her mother, Mayoni said, “white-knuckled her way through menopause.” She was proud of it. She finished her periods, declared herself done, and moved on. Within a few months she had type 2 diabetes. Within a year she needed her first cardiac stents. More stenting followed. As Mayoni put it, “She was a generation that really demonstrated the exact — the immediacy of what happens to women as they traverse that time, that inflection point where we lose the protection of estrogen amongst other hormones.”
This is the central thesis of the episode, and it is one of the most underappreciated facts in longevity medicine. Menopause is a checkpoint, but it is not the event. The event is perimenopause — the ten-to-fifteen-year window leading up to the final menstrual period, when estrogen levels begin to fluctuate, progesterone drops, and the body loses a protective metabolic and cardiovascular buffer it has had since puberty. Everything that quietly shows up in a woman’s fifties and sixties — insulin resistance, atherosclerosis, cognitive decline, bone loss, sarcopenia — was almost always cooking in her forties. By the time the formal diagnosis appears, the window for easy reversal has largely closed.
The Cortisol Trap
What sharpens this risk further, Mayoni explained, is modern life itself. She had three children under three while in the middle of her surgical training. Long days, long nights, zero recovery. Her first pregnancy’s glucose tolerance test came back borderline. She was chronically exhausted. The biology of that period is not mysterious: sustained high cortisol blunts insulin sensitivity, disrupts sex hormone production, accelerates visceral fat deposition, and erodes the body’s ability to recover from oxidative stress. By the time that cohort of women enters perimenopause, they are already running on a metabolic reserve that is dangerously thin.
This is why Mayoni treats pregnancy history as a near-prophetic data point. A borderline glucose tolerance result at 34 is not a footnote. It is a preview. It tells you how that woman’s metabolism will respond to the hormonal drawdown of perimenopause, and it should be driving preventive action a decade before most GPs even begin the conversation.
What Functional Medicine Actually Is
Functional medicine is sometimes dismissed as “alternative.” Mayoni’s response cuts through that charge cleanly. “None of it is witchcraft or voodoo or snake oil. It is the very foundations of the work we learned about for three years at medical school.” The difference is that the standard-of-care model, particularly in hospital systems, strips the time and context out of the encounter. Patients are moved through. Histories are truncated. Reference ranges are glanced at. What functional medicine restores is the time to read a full life history, the matrix to cluster disparate symptoms into coherent patterns, and the timeline to see how early childhood events, environmental exposures, and life stressors shaped the biology that is now presenting in the clinic.
The most emotional aha moment her patients reach, she told me, is not hearing a diagnosis. It is seeing their own timeline. Decades of symptoms they had dismissed as unrelated suddenly line up as one long, legible story. Her patients often cry. They are not sad. They are finally understood.
Normal Is Not Optimal
This is where Mayoni and I converge most completely. The reference ranges on a standard blood panel are not medical truth. They are a statistical description of the average patient in a given lab’s population — a population that in most developed countries is metabolically sick. “Normal” fasting glucose, “normal” ApoB, “normal” vitamin D — these are often the values of someone already on the trajectory to chronic disease, just not there yet.
Vitamin D is her favorite illustration. A patient whose level “just creeps into the normal range” at 50 is not a well patient. She wants it around 100. Especially, she noted, in someone who carries a VDR SNP receptor variant — a common polymorphism that reduces the effectiveness of vitamin D at the receptor. That patient needs higher circulating levels than a neighbor with a functional receptor, simply to achieve the same cellular outcome. Personalization is not a luxury in modern medicine. It is the whole point.
Ketosis as a Reset, Not a Religion
Mayoni’s Body Fit program uses a 16-week nutritional ketogenesis under medical supervision, pulling patients — mostly women — into ketosis through whole-food carbohydrate and fat restriction, then gradually reintroducing complex natural carbs. What I appreciated most was her pushback on the ketosis-as-lifestyle mythology. “The evidence is mixed about sustained ketosis,” she said, “particularly in women.” The risk of accelerated sarcopenia is real, and women entering perimenopause are already fighting a baseline muscle-loss headwind. Her rule is clean and defensible: hit ketosis hard, hit it short, use it as a biochemical reset, then come out into a sustainable complex-carb pattern with the palate, glucose regulation, and food relationship rebuilt.
The Ovarian Age Clock
The single most exciting piece of new science we discussed was ovarian age clocks — epigenetic tests that can now predict, with meaningful accuracy, when a woman will reach her final ovulation. Companies like Timeless Biotech are commercializing this technology now. Mayoni’s framing was crucial. This is not a terrifying countdown. It is a planning tool. If a woman knows her last ovulation will occur in six years, she has six years to optimize her metabolic health, her bone density, her cardiovascular reserve, her cognitive trajectory, and her hormonal support plan — before the protective umbrella of endogenous estrogen drops away. You cannot act on data you do not have. For the first time, we finally have it.
Where This Is Going
Mayoni’s vision for the next decade is one where AI decodes the torrent of lab data coming out of any honest functional workup, so that clinicians can spend their time doing what only a human can do — sit with a patient, hear the full story, and translate 20 biomarkers into two or three decisions the patient can actually make on a Tuesday. She wants the NHS-private-medicine divide to narrow by pushing prevention upstream, before people are sick enough to qualify for national-health-service attention. And she wants women to stop white-knuckling through the most consequential hormonal transition of their lives.
“Eat better, move better, sleep better. It’s that beautiful mundane, right? The things we find slightly boring. Unfortunately, those habits are the things that inform our health later on.”
That is the whole game, right there. The fancy interventions matter. The clocks and the AI tools and the personalized hormone protocols matter. But none of them substitute for the mundane foundation. Perimenopause is not destiny. It is a window. Women who know it is a window, and who use it, end up in a completely different place from women who are taught to endure it.
Watch the Full Episode
The full conversation with Dr. Mayoni Gooneratne is available now on the Health Longevity Secrets YouTube channel. We go deeper into her Human Health Roadmap — gut health, hormones, nervous system, mitochondria — as well as the Thrive program built specifically for perimenopause, the 16-week Body Fit metabolic reset, and the question of how to build a longevity practice that does not lose the clinician to the algorithm.
If you are a woman in your thirties, forties, or fifties — or if you love one — this episode is worth the hour. Share it with someone who has been told her symptoms are “just perimenopause.” And if you have not yet read Lies I Taught in Medical School, the chapters on reference ranges and chronic disease drift are the right companion to this conversation.
Until next time — keep questioning, keep learning.
Sources:
Dr. Mayoni Gooneratne — Human Health clinic: humanhealth.clinic
British College of Functional Medicine: bcfm.org.uk
Institute for Functional Medicine: ifm.org
Future Patient digital magazine and congress: futurepatient.org
Ovarian age clock / reproductive aging research (Nature 2024): nature.com
North American Menopause Society — hormone therapy position statement: menopause.org