The Mind-Gut Conversation Podcast

Eating for your microbiome doesn't have to be complicated — but it does require rethinking how we approach food, carbohydrates, and flavor.

In this episode of The Mind–Gut Conversation, Dr. Mayer is joined by Anu Simh, a board-certified functional health coach, microbiome educator, and author of Flourish from Within: New Gut for Lifelong Health. Anu's work bridges the gap between microbiome science and real-world application, offering a framework for eating that supports microbial diversity without rigid meal plans or overwhelming recipes.

They explore why diversity matters more than any single superfood, how to distinguish beneficial complex carbohydrates from refined ones, and why traditional cuisines — like Anu's South Indian roots — have been quietly aligned with microbiome science all along. The conversation also covers the role of herbs and spices as important sources of polyphenols, how to retrain your palate to accept bitter flavors, and how to build simple, repeatable eating patterns that actually stick in people's lives.

This episode offers a grounded, science-based look at what it means to feed your microbiome, and how to translate research into sustainable habits that support gut health and long-term well-being.

Topics discussed include:
• Why microbial diversity is more important than any single superfood
• How traditional cuisines align with microbiome science
• The difference between refined and complex carbohydrates
• Herbs and spices as polyphenol-rich additions to everyday meals
• Retraining your palate to accept bitter and diverse flavors
• Building simple, repeatable eating patterns for gut health

This is a practical, science-driven discussion for anyone interested in the gut microbiome, plant-forward eating, and the brain–gut connection.

Chapters:
0:00 - Introduction
2:36 - Anu's Origin Story and Journey to Microbiome Science
8:46 - Has Plant-Forward Eating Reached the General Public?
25:08 - The Flourish Diet
34:54 - Herbs, Spices, and Retraining Your Plate
45:07 - Closing Remarks and Practical Recipes

Fiber has been talked about for decades — but emerging research suggests most of us still don't understand what it actually does, how much we need, or why the modern diet has left us so dramatically short of it.

In this episode of The Mind–Gut Conversation, Dr. Mayer is joined by Dr. Matt Amicucci, food scientist and co-founder of OneBio, to discuss the cutting-edge science of dietary fiber and its far-reaching role in gut health, metabolism, and disease prevention.

Dr. Amicucci explains how different fiber structures interact with specific microbial communities in the gut to produce short-chain fatty acids like butyrate — and how those molecules influence everything from blood glucose regulation to GLP-1 secretion to long-term mortality risk. He also shares the story behind Glycopedia, the largest dietary fiber database ever built, and how it is being used to develop a new generation of personalized, microbiome-targeted nutrition.

They also discuss why 95% of Americans fall short of even the minimum recommended fiber intake, how decades of food processing have systematically stripped fiber from the diet, and what it will take to close that gap.

This is a practical, science-driven discussion for anyone interested in nutrition, the gut microbiome, and the future of food.

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

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Chapters:
0:00 - Introduction
2:38 - Matt's Origin Story: From Chef to Food Scientist
6:43 - Why Fiber Is Having a Moment
8:58 - The Fiber Deficit Crisis
11:36 - What Decades of Low Fiber Intake Has Done to the Microbiome
13:47 - Building Glycopedia: Mapping the World's Fibers
19:33 - Why Whole Foods Alone Aren't Enough
21:42 - Not All Fiber Is Created Equal
25:47 - Introducing GoodVice
27:34 - The Health Case for 10 More Grams a Day
33:49 - Rethinking Sugar and Fiber Together
36:34 - Fiber, Butyrate, and GLP-1
38:42 - The Future of Personalized Fiber Nutrition
40:17 - What's Next for OneBio

Chronic pain is often treated as a problem to suppress with medication or surgery, but what if it’s actually a signal from a complex system that needs to be addressed holistically?
In this episode of The Mind–Gut Conversation, Dr. Mayer is joined by Jared E. Katz, author of Retrain the Brain: Self-Help for Traumatic Brain Injury and creator of the pain management app Painless. Jared’s story begins more than twenty years ago, when a traumatic brain injury left him with cognitive impairment and two rare, painful conditions: Chiari malformation and syringomyelia.
Rather than accepting a life defined by pain, Jared spent years quietly experimenting with how he eats,sleeps, moves, and thinks. He developed what he calls a “brain health algorithm” — a set of daily practices spanning nutrition, cognitive activity, movement, sleep, and social engagement. The result is not just a book, but a blueprint for anyone living with chronic pain or seeking to understand whatbrain health truly looks like in practice.
This episode is slightly different from our usual focus on the gut microbiome, but the principles align closely with the holistic, systems-based thinking Dr. Mayer teaches. Jared’s experience demonstrates that the brain is not a machine with one broken part — it’s a dynamic, interconnected system capable of adaptation and healing when given the right conditions.
Topics discussed include:
• What a “brain health lifestyle” actually involves
• How anti-inflammatory nutrition and eating patterns affectpain and cognition
• Why chronic pain requires addressing multiple systems, notjust one symptom
• How cognitive exercises like writing can help rewire thebrain
• The future of personalized pain management
This is a practical, deeply human conversation for anyoneinterested in chronic pain, brain health, and the power of self-directed healing.

Chapters:
0:00 - Introduction
6:04 - Jared's Story: The Injury & Living With Chronic Pain
11:30 - Nutrition, Diet & the WAH Principle
16:57 - The Painless App & the Future of Pain Management
22:30 - The Five Pillars of a Brain Health Lifestyle
27:48 - Resilience, Recovery & the Gut-Brain Connection
35:11 - Psychedelics, Neuroplasticity & Closing Thoughts

Menopause is often described as a simple decline in estrogen production, but emerging microbiome research suggests the story is far more complex.

In this episode of The Mind–Gut Conversation, Dr. Mayer is joined by Dr. David Meriwether, a scientist at UCLA’s Goodman Luskin Microbiome Center, to discuss the estrobolome — a specialized group of gut microbes that recycle and reactivate estrogen after it has been excreted by the body.

They explore how gut microbes may contribute to circulating estrogen levels even after menopause, why menopausal symptoms vary so widely among women, and how changes in the microbiome may create feedback loops that influence symptom severity. The discussion also places this research in the broader context of recent findings published in Nature linking the gut microbiome to health, aging, and disease.

This episode offers an in-depth, evidence-based look at a new biological framework for understanding menopause, and the potential for future non-hormonal strategies rooted in the brain–gut–microbiome system.

Topics discussed include:
• What the estrobolome is and why it matters
• How gut microbes recycle estrogen after menopause
• Why some women experience fewer menopausal symptoms than others
• The interaction between the gut, hormones, and aging
• Where microbiome-based therapies for menopause may be headed

This is a practical, science-driven discussion for anyone interested in women’s health, menopause, and the evolving role of the gut microbiome.

You can support & learn more about Dr. Meriwether's work here: https://themeriwetherlab.com/

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

In this episode of The Mind–Gut Conversation, Dr. Emeran Mayer sits down with Tim Spector, MD, to discuss the implications of a landmark gut microbiome study involving more than 34,000 participants — one of the largest and most comprehensive efforts to date to understand what a “healthy” gut microbiome actually looks like.

Drawing from the study’s novel design and findings, they explore why defining gut health is far more complex than identifying a short list of “good” or “bad” microbes. The conversation unpacks what large-scale microbiome data can, and cannot tell us about health, disease prevention, and the growing interest in microbiome testing as a tool for personalized nutrition and healthcare.

Together, they examine the deep connections between diet and the microbiome, highlighting why dietary patterns, particularly fiber- and prebiotic-rich foods, may play a more meaningful role than many commonly marketed probiotic products. They also discuss the challenges of translating microbiome research into actionable guidance for consumers and clinicians, and why education and context are essential as microbiome testing becomes more widely available.

This wide-ranging discussion blends cutting-edge microbiome science with practical insight, offering a grounded perspective on where the field is headed and how emerging research may eventually shape everyday health decisions.

Topics discussed include:
• What a large-scale microbiome study reveals about gut health
• Why defining a “healthy” microbiome is more complex than expected
• The limitations of labeling microbes as simply good or bad
• The role of diet, fiber, and prebiotics in shaping the microbiome
• The promises and pitfalls of microbiome testing
• How microbiome research may influence future healthcare practices

This is a practical, evidence-based discussion for anyone interested in gut health, whether navigating dietary choices personally, exploring microbiome testing, or working in a clinical or research setting.

Please leave any comments or feedback on the episode — we’d love to hear your thoughts.

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Chapters:

00:00 Introduction
02:05 The Landmark Study Overview
05:29 Defining Healthy Gut Microbiomes
10:02 The Good vs. Bad Microbes
13:59 Implications for Diet and Health
18:37 The Role of Prebiotics and Probiotics
23:27 Future Directions in Microbiome Research
27:49 Challenges in Proving Causality
31:51 The Future of Gut Health Testing
36:36 Future Outlook in Traditional Medicine
40:10 Microbiome Testing in Clinical Practice
43:20 Regulation, Wellness, and Medical Use
46:10 Personalizing Diet Through the Microbiome
48:50 Final Reflections