Wide release date: June 5, 2025

Episode Summary: Dr. David Healy critiques modern medicine, focusing on SSRIs and psychiatric medicine, including: how pharmaceutical companies manipulate clinical trial data, ghostwrite studies, and influence medical practice, often ignoring patient experiences; highlighting issues like post-SSRI sexual dysfunction (PSSD), the immediate sensory effects of SSRIs, and their potential to induce suicidal or violent behavior; challenging the reliance on randomized controlled trials (RCTs) over individual patient reports; and more.

About the guest: David Healy, MD, PhD, a psychiatrist and psychopharmacologist, has decades of experience researching the serotonin system and SSRIs, working across Ireland, the UK, Canada, and the US. He is a professor at McMaster University and a vocal critic of pharmaceutical industry practices.

Discussion Points:

* SSRIs cause near-immediate sensory effects, like genital numbing, in most people.

* Post-SSRI sexual dysfunction (PSSD) can persist for years or decades after stopping the drug, affecting many long-term users.

* Healy argues RCTs prioritize averages over individual experiences, often missing serious side effects like suicidality.

* Pharmaceutical companies ghostwrite studies and manipulate data, with journals like the New England Journal of Medicine publishing misleading articles.

* Serotonin theory of depression lacks evidence.

* Industry tactics include dismissing patient reports as anecdotes and using high doses in trials to mask weak efficacy.

* SSRIs can increase suicide risk, not just during initiation but also when adjusting doses or withdrawing, as seen in cases like the Aurora movie theater shooting.

* Regulatory bodies like the FDA often fail to investigate adverse effects due to bureaucratic processes and lack of follow-up.

* Healy emphasizes doctors’ failure to prioritize patient observations, driven by industry-influenced standards of care.

Related episode:

* M&M 88: Depression, Serotonin, SSRIs, Psychiatry & Social Media | Joanna Moncrieff

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:04:41 Critique of Western History Narrative00:09:19 Internet & Information Democratization00:15:14 SSRI Development & Medical Observation00:23:42 Early SSRI Research & Patient Insights00:31:11 Nature of Evidence in Medicine00:37:52 Immediate SSRI Effects & Misconceptions00:45:16 Acute SSRI Sensory Impacts00:53:13 Long-term SSRI Side Effects01:00:31 SSRI Trial Design & Industry Tactics01:09:32 Data Manipulation in Drug Approval01:16:15 Post-SSRI Sexual Dysfunction (PSSD)01:24:47 PSSD Manifestations & Prevalence01:36:19 SSRI Withdrawal Challenges01:44:02 Ghostwriting & Industry Influence01:51:41 SSRIs, Suicide, & Violence02:03:01 Final Thoughts on Psychiatric Medicine

Full AI-generated transcript below. Beware of typos & mistranslations!

Wide release date: May 25, 2025

Episode Summary: CaaMTech CEO Dr. Andrew Chadeayne, discusses the chemistry of magic mushrooms and other psychedelics, their potential therapeutic applications, and the challenges of commercializing them in a shifting biotech market. The conversation delves into the complexities of magic mushroom composition, debunking myths like "lemon tekking," and uncovers the booming, unregulated alternative products industry, including kratom and synthetic psilocybin analogs sold in vape shops.

About the guest: Andrew Chadeayne, PhD is a chemist who also holds a law degree, specializing in patent law. He is the founder and CEO of CaaMTech, a startup specializing in the development of novel psychedelic compounds. Chadeayne collaborates with academic labs to advance psychedelic science while navigating the commercial landscape.

Discussion Points:

* Psilocybin is a prodrug converted to psilocin, but magic mushrooms contain other psychoactive molecules like beta-carbolines, which may enhance effects by inhibiting degradation.

* Chadeayne’s team develops psilocin prodrugs to shorten psychedelic trips, making clinical administration more manageable without altering effects.

* The "lemon tek" myth—that lemon juice converts psilocybin to psilocin—is false; it enhances absorption by extracting compounds, not altering chemistry.

* Magic mushroom bruising indicates psilocin degradation, as oxidized psilocin forms blue, inactive dimers.

* The multi-billion dollar alternative products industry sells kratom and synthetic psilocybin analogs, often mislabeled, in vape shops, raising safety and regulatory concerns.

* Kratom’s minor alkaloid, 7-hydroxymitragynine, is ~40x more potent than morphine.

* Non-hallucinogenic serotonin 2A agonists, like those developed by CaaMTech’s spinout, show promise for conditions like migraines without requiring a psychedelic trip.

Related episode:

* M&M 71: Chemistry of Magic Mushrooms, DMT Analogues, Entourage Effects in Cannabis & Fungi, Novel Psychedelic Medicines, Psychedelic Startups | Andrew Chadeayne

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:02:21 Guest Background & CaaMTech Overview00:08:55 Psychedelic Chemistry & Magic Mushroom Molecules00:15:38 Developing New Psychedelic Prodrugs00:22:14 Academic Collaborations & Science Funding00:29:13 Non-Hallucinogenic Psychedelic Derivatives00:35:53 Debunking Psilocybin Myths00:44:16 Gray Market & Magic Mushroom Chocolate Bars00:54:33 Kratom & Alternative Products Industry01:03:00 7-Hydroxymitragynine Risks & Regulation01:12:51 Industry Self-Regulation & Future Directions01:22:17 Therapeutic Potential Without the Trip01:30:29 CaaMTech’s Future & Scientific Integrity

Full AI-generated transcript below. Beware of typos & mistranslations!

Wide release date: May 15, 2025

Episode Summary: New research on how dietary fats, particularly omega-6 fatty acids like linoleic acid, influence triple-negative breast cancer progression by activating the mTOR pathway, a key regulator of cell growth. They explore the role of the FABP5 protein in enhancing cancer cells’ sensitivity to omega-6 fats, the differences between breast cancer subtypes, and the broader implications of dietary balance for health, emphasizing the need for personalized nutrition strategies.

About the guest: John Blenis, PhD is a Professor of Pharmacology and Associate Director of Basic Science at the Meyer Cancer Center at Weill Cornell Medicine. Nikos Koundouros, PhD is a postdoctoral fellow in Blenis’ lab, focusing on nutrient sensing in breast cancer.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Key Conversation Points:

* mTOR’s Role: mTOR pathway acts as a cellular “brain,” sensing nutrients like amino acids, glucose, and fats to regulate growth, but its dysregulation can drive cancer.

* Omega-6 PUFAs & Cancer: High dietary omega-6 fatty acids, like linoleic acid found in seed oils, can fuel triple-negative breast cancer growth by activating mTOR, especially in cells with high FABP5 expression.

* FABP5 as a Biomarker: FABP5, a lipid chaperone protein, is overexpressed in triple-negative breast cancer, making these tumors more sensitive to omega-6 fats, suggesting its potential as a therapeutic target.

* Dietary Balance Matters: Modern diets with high omega-6 to omega-3 ratios disrupt inflammation balance, unlike historical 1:1 ratios, potentially increasing cancer risk.

* Personalized Nutrition: Genetic variations and cancer subtypes highlight the need for tailored dietary recommendations, as blanket nutrition advice may not suit all patients.

* Research Gaps: While omega-6 fats exacerbate existing triple-negative breast cancer, their role in initiating cancer remains unclear, requiring further study.

* Broader Implications: High omega-6 intake may influence other cancers (e.g., prostate, colon) and chronic diseases like obesity, linked to FABP5 and inflammation.

Related episode:

* M&M 200: Dietary Fats & Seed Oils in Inflammation, Colon Cancer & Chronic Disease | Tim Yeatman & Ganesh Halade

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:03:15 mTOR Overview00:11:40 Nutrient Sensing by mTOR00:19:26 Breast Cancer Subtypes00:27:07 Diet & Cancer Links00:34:56 Essential Fatty Acids00:43:16 Linoleic Acid Biochemistry00:50:35 Study on Omega-6 & Breast Cancer00:59:23 FABP5 & Omega-6 Sensitivity01:08:30 Linoleic Acid & mTOR Interaction01:15:50 Cause and Effect in Animal Models01:23:48 Omega-3 Effects & Broader Implications01:33:26 Clinical Studies & Nutrition Debates01:41:59 Final Thoughts & Future Research

Full AI-generated transcript below. Beware of typos & mistranslations!

Wide release date: May 10, 2025

Episode Summary: Dr. Gyorgy Buzsaki discusses the hippocampus’s role beyond memory and spatial navigation, delving into its broader functions in cognition, action planning, and brain-body interactions; how hippocampal rhythms, like sharp wave ripples, influence memory consolidation, glucose regulation, and metabolic health, challenging conventional neuroscience assumptions; the interplay of brain rhythms, sleep, and preconfigured neural dynamics; the history and conceptual foundations of neuroscience; and more.

About the guest: Gyorgy Buzsaki, MD, PhD is a professor at NYU. He leads a lab investigating how neural circuits underpin cognition, particularly through oscillations and brain-body interactions. His work has significantly advanced understanding of memory formation and spatial navigation.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Key Conversation Points:

* Hippocampus isn’t just for memory or navigation; it may orchestrate action planning and abstract representations of the world, shaped by evolutionary constraints.

* Brain rhythms, like sharp wave ripples, synchronize neural activity, enabling efficient communication and impacting bodily functions like glucose homeostasis.

* Sharp wave ripples, prominent during non-REM sleep and consummatory states, are critical for memory consolidation and may link sleep disruptions to metabolic disorders.

* Buzsaki challenges the idea of memory as fixed synaptic patterns, proposing it’s more like dynamic, cloud-like sequences, endlessly reconfigurable.

* The brain’s intrinsic dynamics prioritize action generation and learning from consequences over external representations.

Related episode:

* M&M 16: Sleep, Dreams, Memory & the Brain | Bob Stickgold

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:03:21 Gyorgy Buzsaki Intro00:05:04 Hippocampus Functions00:10:32 Action Planning Hypothesis00:15:39 Preconfigured Constraints00:21:26 Historical Neuroscience Perspectives00:29:57 Inherited Conceptual Assumptions00:38:27 Place Cells Discovery00:49:47 Neural Energy Costs00:57:24 Brain Dynamics Maintenance01:05:04 Brain Rhythms Overview01:15:36 Gamma Oscillations Role01:22:09 Memory and Engrams01:30:45 Sharp Wave Ripples and Metabolism01:39:30 Ripple Emergence Contexts

Full AI-generated transcript below. Beware of typos & mistranslations!

Episode Summary: Dr. Nirosha Murugan discusses the role of biophysics in biology, focusing on how light, particularly biophotons emitted by cells, influences processes like wound healing, neural activity, and cancer detection; how microtubules may act as biological fiber optics, the impact of modern light environments on health; her work inducing limb regeneration in frogs using silk hydrogels and growth factors; cancer as an energetic dysfunction; the potential of non-invasive photonic diagnostics; the need for new tools to study these phenomena.

About the guest: Nirosha Murugan, PhD is a biophysicist and assistant professor at Wilfrid Laurier University in Waterloo, Ontario, focusing on how optical, magnetic, and electric signals influence biological processes. Her lab investigates bioelectricity, biophotonics, and regeneration, aiming to leverage these signals for disease detection and tissue engineering.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Key Conversation Points:

* Cells emit biophotons, ultra-weak light tied to metabolism, which may carry information for processes like immune response and neural communication.

* Microtubules might function as biological fiber optics, potentially guiding light within cells for signaling purposes.

* Red and near-infrared light can accelerate wound healing and reduce inflammation, likely by modulating mitochondrial activity.

* Cancer cells emit distinct photonic signatures, which could enable non-invasive diagnostics by detecting light differences from healthy tissues.

* Modern light environments, unlike natural sunlight, may subtly affect health by altering biological responses to electromagnetic signals.

* Regeneration in adult frogs was induced using silk hydrogels and growth factors, hinting at ways to reawaken human regenerative potential.

* Biological systems act as metamaterials, patterning energy flow in ways that constrain and shape molecular and behavioral outcomes.

Related episode:

* M&M 221: Regenerative Energy & the Light Inside You | Jack Kruse

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:01:37 Nirosha Murugan Intro00:04:11 Light Beyond Vision00:09:07 Biophotons Explained00:15:15 Water's Biophysical Role00:20:21 Microtubules as Fiber Optics00:28:13 Microtubule Functionality00:34:35 Biophoton Detection Tools00:41:22 Optogenetics Insights00:48:17 Brain Photon Detection00:54:48 Physics of Life01:01:12 Energy in Biology01:07:45 Electromagnetic Concerns01:13:45 Regeneration Research01:19:49 Wound Healing & Light01:25:30 Cancer Photonics01:32:27 Future of Biophysics

Full AI-generated transcript below. Beware of typos & mistranslations!

Episode Summary: Dr. Alex Kwan discusses how psychedelics like ketamine and psilocybin induce rapid neuroplastic changes in the brain, particularly in the prefrontal cortex, contrasting their effects with traditional antidepressants like SSRIs, and exploring their potential for treating depression and chronic pain through structural and functional brain alterations.

About the guest: Alex Kwan, PhD, is an associate professor of biomedical engineering at Cornell University. His lab employs advanced imaging to study how psychedelics and other drugs affect the mammalian brain.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Key Discussion Points:

* Ketamine & psilocybin rapidly increase dendritic spine density in the prefrontal cortex, enhancing neural connections within days, unlike SSRIs, which take weeks.

* These drugs show sustained neuroplastic changes in mice, lasting weeks to months after a single dose, suggesting long-term brain rewiring.

* Serotonin 2A receptor is critical for psilocybin’s neuroplastic effects, as precise genetic knockouts in adult mice eliminate spine growth.

* Unlike ketamine, psilocybin activates the insula, a brain region linked to chronic pain processing, hinting at new therapeutic potential.

* Both drugs induce similar gene expression patterns in areas like the prefrontal cortex and amygdala, but differ in specific regions like the insula.

Reference paper:

* Study: Psilocybin’s lasting action requires pyramidal cell types and 5-HT2A receptors

Related episode:

* M&M #30: Psilocybin, Ketamine, Neuroplasticity & Imaging the Brain | Alex Kwan

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:04:32 Cerebral Cortex Structure00:09:00 Excitatory vs. Inhibitory Neurons00:14:20 Depression & Neuroplasticity00:19:19 SSRI Effects & Limitations00:24:34 Ketamine & Psilocybin Rapid Effects00:30:00 Dendritic Spine Plasticity00:36:01 Serotonin 2A Receptor Debate00:41:32 Ketamine vs. Psilocybin Mechanisms00:46:08 Measuring Psychedelic Effects in Mice00:52:13 Head Twitch Response Limitations00:57:10 Serotonin 2A Receptor Knockout Results01:03:19 c-Fos Mapping Insights01:09:28 Future Research Directions

Full AI-generated transcript below. Beware of typos & mistranslations!

Short Summary: The flaws of nutrition epidemiology with Dr. John Speakman

About the guest: John Speakman, PhD is a professor at the University of Aberdeen and runs a lab in Shenzhen, China, focusing on energy balance, obesity, and aging.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Episode Summary: Dr. John Speakman explores the pitfalls of nutrition epidemiology, a field that links diet to health outcomes like cancer and obesity but often produces contradictory results. They discuss flawed methods like 24-hour recalls and food frequency questionnaires, which rely on memory and are prone to bias, and introduce Speakman’s new tool using doubly labeled water to screen implausible dietary data. The conversation highlights systematic biases, such as under-reporting by heavier individuals, and emerging technologies like photo diaries and AI for better dietary tracking.

Key Takeaways:

* Nutrition epidemiology studies often contradict each other due to unreliable methods.

* Common techniques like 24-hour recalls & food frequency questionnaires suffer from memory issues, portion size issues, and systematic biases, often underestimating food intake.

* Heavier individuals (higher BMI) under-report food intake more, skewing associations between diet & obesity.

* Speakman’s tool, based on 6,500 doubly labeled water measurements, predicts energy expenditure to flag implausible dietary survey data.

* Emerging technologies, like smartphone photo diaries and AI food identification, promise more accurate dietary tracking than traditional surveys.

* Randomized controlled trials, not surveys, provide the most reliable dietary insights; single-day intake surveys linked to outcomes years later are dubious.

* Speakman advises ignoring most nutrition epidemiology headlines due to their inconsistency and lack of prognostic value for behavior change.

Related episode:

* M&M #132: Obesity Epidemic, Diet, Metabolism, Saturated Fat vs. PUFAs, Energy Expenditure, Weight Gain & Feeding Behavior | John Speakman

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:03:08 Nutrition Epidemiology Overview00:08:12 Flaws in Dietary Recall Methods00:14:42 Food Frequency Questionnaire Issues00:20:12 Validation Problems in Studies00:26:22 Basal Metabolic Rate Validation00:32:10 Doubly Labeled Water Technique00:38:20 New Predictive Tool for Surveys00:43:41 Systematic Biases in Data00:50:06 Improving Data with Red Flags00:56:15 Emerging Technologies for Tracking01:02:01 Advice on Nutrition Headlines

Full AI-generated transcript below. Beware of typos & mistranslations!

Short Summary: Cancer’s metabolic roots with Dr. Thomas Seyfried.

About the guest: Thomas Seyfried, PhD is a professor of biology at Boston College. He has researched cancer metabolism, epilepsy, and lipid biochemistry for over 40 years.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Transcript and other information on Substack.

Episode Summary: Dr. Thomas Seyfried discusses the mitochondrial metabolic theory of cancer, challenging the dominant somatic mutation theory. He explores how cancer cells rely on fermentation due to defective oxidative phosphorylation, drawing on Otto Warburg’s work. Seyfried explains how ketogenic diets and nutritional ketosis can starve cancer cells by limiting glucose and glutamine, while sharing evidence from nuclear transfer experiments and clinical studies. The conversation also covers environmental factors driving cancer and the importance of metabolic flexibility for prevention.

Key Takeaways:

* Cancer is characterized by dysregulated cell growth, but Seyfried argues it stems from mitochondrial dysfunction, not just genetic mutations.

* Cancer cells ferment glucose & glutamine, unable to use fatty acids or ketones, making ketogenic diets a potential therapeutic tool.

* Nuclear transfer experiments show cancer traits reside in the cytoplasm, not the nucleus, challenging the somatic mutation theory.

* Environmental factors like processed foods, stress, and poor sleep disrupt mitochondrial function, increasing cancer risk.

* Seyfried’s glucose-ketone index helps monitor metabolic states to manage cancer & chronic diseases.

* Cancer rates are rising in younger people, possibly due to obesity, inflammation, and environmental toxins.

* Metabolic flexibility, cycling between ketosis and carb-based states, may mimic ancestral patterns and reduce chronic disease risk.

Related episode:

* M&M #215: Cancer Metabolism: Sugar, Fructose, Lipids & Fasting | Gary Patti

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:02:57 Cancer Basics00:07:41 Genetic Theory of Cancer00:10:38 Ketogenic Diet Insights00:13:42 Warburg’s Hypothesis00:20:19 Biochemical Debates00:24:08 Molecular Biology Era00:30:07 Genetic Theory Flaws00:36:41 Nuclear Transfer Evidence00:41:59 Metabolic Theory Overview00:48:31 Fermentation in Cancer00:56:00 Mitochondrial Coupling Explained01:02:05 Mitochondrial Haplotypes01:09:56 Ketogenic Diet for Cancer01:15:22 Ketones vs. Glucose Efficiency01:21:10 Metabolic Flexibility01:24:55 Causes of Mitochondrial Damage01:29:27 Light and Mitochondrial Health01:33:13 Ketogenic Diet Composition01:39:40 Cancer Trends01:44:32 Cancer Prevention Tips01:46:17 Closing Remarks

Full AI-generated transcript below. Beware of typos & mistranslations!

Short Summary: Heart health and the ketogenic diet, with expert insights from a cardiologist and researcher.

About the guest: Matthew Budoff, MD, is a preventive cardiologist and professor of medicine at UCLA School of Medicine.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Dr. Matthew Budoff discusses cholesterol, heart disease, and his study on the ketogenic diet’s impact on lean, metabolically healthy individuals with high LDL cholesterol. He explains LDL, HDL, and triglycerides, debunking myths about their direct link to heart disease, and emphasizes the importance of coronary calcium scans to assess plaque buildup. The study found no significant plaque progression in these individuals despite elevated LDL, challenging conventional cardiology views. Budoff also covers statins, dietary cholesterol, and personalized heart health strategies.

Key Takeaways:

* LDL cholesterol is not a definitive predictor of heart disease; plaque buildup, assessed via coronary calcium scans, is a better indicator.

* Lean metabolically healthy people on a ketogenic diet may have high LDL without increased plaque progression after one year.

* Coronary calcium scans, costing ~$100, are recommended for men around age 40 and women around 45-50 to evaluate heart disease risk.

* Statins effectively lower LDL and can reverse soft plaque, but may be overprescribed for those without plaque buildup.

* Dietary cholesterol has a minimal impact on blood cholesterol, as the liver produces ~85% of it.

* The ketogenic diet can aid weight loss and diabetes control but may cause high LDL in some lean individuals, known as lean mass hyper-responders.

* Plaque progression depends more on existing plaque than LDL levels in metabolically healthy ketogenic diet followers.

* Heart health varies widely due to genetics and other unknown factors, underscoring the need for personalized assessments.

Related episode:

* M&M #158: Ketosis & Ketogenic Diet: Brain & Mental Health, Metabolism, Diet & Exercise, Cancer, Diabetes | Dominic D'Agostino

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:01:29 Guest Introduction00:02:36 Cholesterol Basics00:09:15 Heart Disease Risk Factors00:13:56 Statins and LDL Management00:18:35 Ketogenic Diet Overview00:24:43 Study Setup and Methods00:31:10 Study Results00:38:19 Heart Scan Recommendations00:44:23 Lean Mass Hyper Responders00:50:08 LDL Guidelines Critique00:55:06 Final Thoughts

Full AI-generated transcript below. Beware of typos & mistranslations!

Short Summary: The science of obesity and appetite regulation, blending genetics and neurobiology with practical insights

About the guest: Giles Yeo, PhD is a professor of molecular neuroendocrinology at the University of Cambridge. He leads a lab studying obesity and appetite regulation.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Nick interviews Dr. Giles Yeo about the genetics and neurobiology of obesity, starting with the discovery of leptin in the obese mouse model, detailing its role in appetite regulation via the hypothalamus, and discussing GLP-1 drugs like Ozempic for weight loss. It delves into how genetic factors, like the leptin-melanocortin pathway, influence hunger, the heritability of body weight, and societal factors driving the obesity epidemic, emphasizing the interplay of biology and environment.

Key Takeaways:

* Leptin, discovered through the obese mouse, signals fat levels to the brain, but its absence causes severe obesity and infertility, as seen in rare human mutations.

* The hypothalamus, a key brain region, senses hormones like leptin and GLP-1, balancing hunger and satiety through POMC (anorexigenic) and AgRP (orexigenic) neurons.

* Body weight heritability is 40-70% at the population level, but this does not mean that 40-70% of someone’s body fat composition is due to genetic factors outside human control. Dr. Yeo unpacks how to think about it.

* GLP-1 drugs (e.g., Ozempic) mimic gut hormones to reduce appetite, offering some people 15-25% weight loss, but require long-term safety monitoring.

* According to Dr. Yeo, obesity reflects energy imbalance, but nutritional density matters more than calorie counting for health, and societal changes are needed to prevent it.

Related episode:

* M&M #132: Obesity Epidemic, Diet, Metabolism, Saturated Fat vs. PUFAs, Energy Expenditure, Weight Gain & Feeding Behavior | John Speakman

*Not medical advice.

* Full audio version: [Apple] [Spotify] [Elsewhere]

* Full video version: [YouTube] [Rumble]

* Support M&M if you find value in this content.

* Episode transcript below.

Episode Chapters:

00:00:00 Intro00:05:04 Discovery of Leptin00:10:32 Hypothalamus Overview00:16:23 Leptin Source and Function00:22:26 Peptides vs. Neurotransmitters00:28:35 Nutrient Sensing in Hypothalamus00:35:43 Metabolism & Leptin Pathway00:42:46 Genetics of Obesity00:51:37 Heritability & Environment00:56:23 GLP-1 & Incretin Hormones01:03:41 Synthetic GLP-1 Drugs01:09:55 Drivers of Overeating01:17:59 Leptin Resistance Debate01:23:47 Current Research & Future Questions01:29:57 Closing Thoughts

Full AI-generated transcript below. Beware of typos & mistranslations!