The Mind-Gut Conversation Podcast

After 45 years of research on how the brain and the gut communicate, the question Dr. Emeran Mayer hears most often is not about mechanisms or studies. It is much simpler than that. People tell him they understand the science, they just do not know how to live it.

In this episode of The Mind-Gut Conversation, Dr. Mayer introduces The Mayer Model, the book he has been working toward for his entire career. He explains why his earlier books, The Mind-Gut Connection and The Gut-Immune Connection, focused on explaining the biology, and why this one is built to close the gap between the evidence and the ordinary decisions people make every day about food, stress, sleep, movement, and recovery.

He traces the long view of how the idea of a bidirectional brain-gut conversation went from a fringe interest to one of the most active areas in biomedical research, and how the discovery of the gut microbiome as a third participant reorganized the entire model. Food is not simply fuel. It is information that trillions of microbes transform into signals that reach every organ, including the brain.

The Mayer Model is not a diet and not a protocol. It is a systems-based way of understanding your own biology clearly enough to make better decisions inside it. Across seven chapters, the book covers the role of diet in shaping the brain-gut-microbiome system, gut-healthy recipes, and detailed guidance on building a gut-healthy lifestyle through movement, sleep, contemplative practices, and vagal stimulation.

Dr. Mayer also shares who he wrote the book for, and how listeners can access a set of launch-window bonuses, including a live Q&A over Zoom, a guided meditation, a recipe guide, and a Mayer Nutrition coupon.

The Mayer Model is available now on Amazon: https://a.co/d/0bkjOcxP

Launch bonuses: https://themayermodel.com/

Topics discussed include:
• Why understanding gut science is not the same as applying it
• How brain-gut research moved from the fringe to the mainstream
• The gut microbiome as the third participant in the brain-gut conversation
• What The Mayer Model is, and what it is not
• What is inside the seven chapters of the book
• Who the book is for, and how to claim the launch bonuses

This episode is brought to you by Mayer Nutrition. We believe real food comes first. A diverse, plant-forward diet is the foundation of a healthy brain-gut-microbiome system, and everything we make is designed to support that foundation rather than replace it. When you want extra support, Mayer Nutrition offers science-informed products like Synaptic Bloom and our proprietary extra virgin olive oil.

Use code MINDGUT for 10% off your first order at www.mayernutrition.com

Connect with Dr. Mayer:
Website: https://www.emeranmayer.com
Instagram: https://www.instagram.com/emeranmayer/
X (Twitter): https://www.x.com/emeranmayermd
Facebook: https://www.facebook.com/EmeranMayerMD/
LinkedIn: https://www.linkedin.com/in/emeranmayer/

Chapters:
0:00 - Introduction
1:04 - The Long View: 45 Years of Brain-Gut Research
2:12 - The Third Participant: The Gut Microbiome
3:15 - From Explanation to Application
4:03 - What Is The Mayer Model?
5:25 - Who This Book Is For
6:12 - How to Get the Book and Launch Bonuses

Modern medicine has never been better at keeping people alive. So why are we spending more of our lives unwell?

In this episode of The Mind-Gut Conversation, Dr. Emeran Mayer examines a new analysis from the Global Burden of Disease project, published in Lancet Public Health, comparing how long people live with how many of those years are lived in good health across 204 countries and territories.

The difference between those two numbers is called the morbidity gap. In 1990 the average person could expect to spend 8.8 years of life in poor health. By 2023 that had risen to 10.7 years, and the gap widened in 203 of the 204 places studied. The wealthiest countries fare worst of all, with the United States leading globally at 14 years.

Dr. Mayer explains what is actually driving those unhealthy years, why the trend now extends across the entire adult lifespan rather than clustering in old age, and why two of the largest contributors sit squarely within the brain-gut-microbiome system.

Topics discussed include:
• What the morbidity gap is and how it is measured
• Why the 45-year-old compression of morbidity hypothesis is being challenged
• Why high-income countries carry the largest health gaps
• The five conditions responsible for most unhealthy years worldwide
• Why health decline is starting in middle age
• The gender health paradox
• Why years lived may be the wrong scoreboard

This is a science-driven discussion for anyone interested in healthspan, healthy aging, and chronic disease prevention.

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This episode is sponsored by Mayer Nutrition. Food comes first, always. For the places where diet leaves a gap, use code MINDGUT for 10% off your first order.

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Chapters:
0:00 - Introduction
1:00 - What This Study Set Out to Test
2:23 - The Morbidity Gap Explained
3:35 - Why Wealthy Countries Rank Worst
5:05 - Health Decline in Middle Age
6:10 - What Fills the Unhealthy Years
7:28 - Men, Women, and the Health Gap
8:31 - Rethinking How We Measure Success
9:39 - Closing Thoughts
11:25 - A Word From Our Sponsor

For most of the last forty years, irritable bowel syndrome was treated as a problem of the gut alone. The idea that the brain plays a central role took decades to gain acceptance, and it remains contested today.

In this episode of The Mind-Gut Conversation, Dr. Mayer is joined by Dr. Erin Mauney, a pediatric gastroenterologist and researcher at Harvard and Massachusetts General Hospital, who has completed one of the first clinical trials of psilocybin-assisted therapy for patients with treatment-resistant IBS.

They discuss why a compound acting primarily on the brain might change how the gut is experienced, what happens when the brain’s prediction machinery becomes locked into a cycle of pain and anticipation, and why the therapy surrounding the dosing sessions may matter as much as the molecule itself.

The conversation also takes on the harder questions. How do you run a placebo-controlled trial when every participant knows they received the drug? Can the psychedelic experience be engineered out of psychedelic medicine, and what is lost if it is? And what can practices used ritually for millennia still teach a reductionist Western model of care?

This is early-stage science, and Dr. Mauney is refreshingly clear about the limits of what is currently known. It is also a glimpse at what the next chapter of brain-gut medicine might look like.

Topics discussed include:
• Why IBS is best understood as a disorder of gut-brain interaction
• How the brain’s predictive coding can become locked into chronic pain
• What psilocybin-assisted therapy actually involves, session by session
• Whether the psychedelic experience itself is essential to the benefit
• The placebo problem in psychedelic trials, and why it may be unsolvable
• How long the benefits appear to last after treatment ends
• Where psychedelic research in gastroenterology may be headed

This is a careful, evidence-based conversation for anyone interested in IBS, chronic pain, and the future of brain-gut medicine.

Chapters:
0:00 - Introduction
3:23 - IBS as a Brain-Gut Disorder
7:40 - Entering Psychedelic Research
13:22 - How Psilocybin Could Affect the Gut
15:43 - Inside the Trial
17:50 - The Brain and Pain Prediction
21:18 - Side Effects and Patient Experience
25:40 - Does the Psychedelic Experience Matter?
29:57 - Ritual and Western Medicine
32:15 - The Placebo Question
36:33 - Combining Therapies
39:10 - Brain Imaging
40:56 - Practical Challenges
44:07 - Durability of Benefits
47:23 - Overlap With Other Conditions
49:28 - Where the Research Goes Next
54:11 - Looking Ahead

Millions of people take a daily probiotic without ever asking a basic question: does any of it survive long enough to do anything?

In this episode of The Mind-Gut Conversation, Dr. Mayer is joined by Kiran Krishnan, a research microbiologist and Chief Scientific Officer at Microbiome Labs who has spent his career studying the human microbiome and the science behind probiotics. Kiran is best known for popularizing spore-based probiotics and for his work on metabolic endotoxemia, the mechanism behind what many people call leaky gut.

The conversation opens with a hard look at what happens to probiotics in the stomach. Kiran describes testing 40 of the leading probiotic brands under standard gastric conditions and finding that none of the strains survived the passage intact. From there they examine why CFU counts have become the industry's main marketing lever despite telling consumers almost nothing, why multi-strain formulas can cause individual strains to cancel each other out, and why some probiotic strains may trigger an inflammatory response rather than calm one.

They also address one of the most persistent myths in the field, the idea that probiotics colonize the gut and reseed the microbiome. Kiran explains why nearly all probiotics, including spores, are transient, and what that means for how these products should actually be evaluated.

The second half turns to the missing microbes hypothesis: the argument that modern agriculture has stripped soil-derived spore-forming bacteria out of our food supply, along with the tilling, monocropping, and synthetic fertilizer practices driving that loss. Dr. Mayer and Kiran connect the health of the soil to the health of the gut, and close with practical guidance on how an ordinary consumer can evaluate a probiotic in an unregulated market.

Topics discussed include:
Why most probiotics do not survive stomach acid
What CFU counts really tell you, and what they do not
Why multi-strain formulas can work against themselves
The myth of probiotic colonization and reseeding the microbiome
How modern agriculture changed the soil microbiome
How to evaluate a probiotic before you buy it

This is a candid, evidence-based conversation for anyone interested in gut health, the microbiome, and separating probiotic science from probiotic marketing.

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This episode is brought to you by Mayer Nutrition. Use code MINDGUT to save 10% on your first order of Synaptic Bloom.

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Chapters:
0:00 - Introduction
2:23 - The Missing Microbes Hypothesis and the Role of Spores
11:51 - Why Most Probiotics Don't Survive the Stomach
20:24 - The Problem With Multi-Strain Formulas
27:41 - How Modern Agriculture Changed Our Soil
43:14 - Colonization, Survival, and What the Evidence Shows
50:03 - How to Choose a Probiotic That Actually Works

Menopause isn't just hot flashes — it's brain fog, bone loss, sleep, mood, and your gut. In this solo episode of The Mind-Gut Conversation, Dr. Emeran Mayer unpacks the ~34 symptoms of perimenopause and menopause, the 2002 hormone-therapy scare that still shapes care today, and what current science says about estrogen and HRT.

Then he turns to the part almost no one is talking about: the estrobolome — the gut microbes that recycle estrogen as part of the brain-gut microbiome system. It may explain why symptom severity varies so widely between women, and why fiber, phytoestrogens, soy isoflavones, and equol point toward a new generation of non-hormonal menopause treatments.

A myth-busting, hopeful look at what we get wrong about menopause — and the science finally setting it right.

Key Topics Covered:
The ~34 symptoms of perimenopause and menopause
The 2002 WHI study and the hormone-therapy backlash
What current science says about estrogen, HRT, and vaginal estrogen
The estrobolome and how the gut recycles estrogen
Phytoestrogens, equol, and fiber as non-hormonal levers
Why there's real reason for hope

Chapters:
0:00 – How many symptoms does menopause really have?
2:21 – Why menopause care was abandoned for a generation
4:40 – The 2002 scare & what we know now about hormone therapy
7:05 – The estrobolome: how your gut recycles estrogen
7:50 – A non-hormonal approach: phytoestrogens & Dr. David Meriwether's research
10:25 – Fiber, ultra-processed foods & the probiotic myth
11:45 – The reframe & the equity gap in menopause care
14:05 – Reasons for hope

Connect with Dr. Mayer:
Website: https://www.emeranmayer.com
Instagram: https://www.instagram.com/emeranmayer/
X: https://www.x.com/emeranmayermd
Facebook: https://www.facebook.com/EmeranMayerMD/
LinkedIn: https://www.linkedin.com/in/emeranmayer/