Today’s conversation takes us somewhere I find endlessly fascinating: the space between what we think we know about food and what’s actually happening inside it. My guest is Dr. Austin Perlmutter, a repeat voice on this podcast and someone whose research keeps pushing this conversation forward in ways that surprise me, even after decades in this field.
We open by talking about what Austin calls the “dark matter” of nutrition. For most of the last century, our understanding of food has been built almost entirely around macronutrients, fat, protein, carbohydrates, with vitamins and minerals treated as a secondary consideration. But research published in the New England Journal of Medicine and other leading journals tells us that food actually contains over 100,000 different molecules, the vast majority of which we’re only beginning to study. That gap between what we measure and what’s actually there is exactly why a loaf of stripped, bleached, fortified white bread can look “complete” on a label and still fail us biologically.
Much of our discussion centers on one group within that dark matter: polyphenols. These are compounds plants produce to defend themselves against UV radiation, communicate with microbes in the soil, and fend off pests. Austin walks through why the old story, that polyphenols matter mainly because they’re antioxidants, is incomplete. The more compelling research points toward something deeper: these molecules appear to influence the gut microbiome, modulate the immune system, and switch on epigenetic pathways that change how our DNA is expressed. We talk through the science connecting polyphenol-rich diets, like the Mediterranean and MIND patterns, to a meaningfully lower risk of Alzheimer’s disease, and even to measurable differences in the rate of brain shrinkage over time.
Austin also brings us inside his own research, including a fascinating body of work on Himalayan Tartary buckwheat, an ancient seed so concentrated in polyphenols that a sprouted version of it drove nearly 900 statistically significant epigenetic changes in a 90-day pilot study. That early signal has since grown into what may be the largest randomized, placebo-controlled trial ever conducted on a single food for its effects on human cognition. We get into what that study is designed to answer, and why Austin believes we need to understand food’s mechanisms with the same rigor we’d demand of a pharmaceutical before we can really call it medicine.
What I appreciate most about this conversation is how practical it becomes by the end. Austin offers simple, real-world signals for identifying polyphenol-rich foods, why that bitterness in a good extra virgin olive oil or a piece of dark chocolate is actually a feature, not a flaw, and makes the case for diversity over supplementation. As he puts it, nature isn’t trying to deliver a precise dose of a single compound; it’s sending your body a whole set of signals it evolved to respond to.
This episode challenges the reflex to reduce food to numbers on a label and invites something more curious in its place. I think you’ll come away from this one thinking differently about your next meal.
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Dr. Austin Perlmutter is an internal medicine physician, New York Times bestselling author, researcher, podcaster and health entrepreneur on a mission to help millions better their brains through lifestyle medicine. His work has been featured in PBS, Rolling Stone, Newsweek, NPR, Fox and other top media outlets. Dr. Perlmutter is the Chief Science Officer of Big Bold Health, where he authored a pioneering clinical trial on plant nutrients for human aging and is the CEO of Lichen Air, providing indoor air solutions for brain health and longevity. He is part of a university team publishing clinical data on the microbiome and epigenetic impact of ayahuasca and is currently overseeing the largest double blinded RCT ever conducted on an individual food for brain health.
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