Kevin Hall, Ph.D., is a physicist-turned-nutrition scientist whose rigorous research has upended our most sacrosanct beliefs about metabolism and weight loss. We discuss why diets fail, the "slow metabolism" myth, ultra-processed foods, and his decision to leave the NIH after 20 years. READ MORE👉🏼http://bit.ly/richroll956 ✌🏼🌱 – Rich This Episode Is Brought To You By… Seed: Save 20% OFF your first order👉🏼https://bit.ly/seedxrrp2025 Momentous: High-caliber human performance products for sleep, focus, longevity, and more. For listeners of the show, Momentous is offering up to 35% off your first order👉🏼https://bit.ly/LiveMomentous2025 Check out all of the amazing discounts from our Sponsors 👉🏾 https://bit.ly/rrpsponsors LISTEN / SUBSCRIBE TO THE PODCAST Apple Podcasts: http://bit.ly/rrpitunes Spotify: http://bit.ly/rrpspotify Google: http://bit.ly/rrpgooglepods Meal Planner: http://meals.richroll.com Voicing Change Book: http://richroll.com/vc Clips Channel: https://www.youtube.com/c/RichRollPodcastClips Newsletter: http://bit.ly/rollcallemail CHAPTERS 00:00:00 Intro 00:02:17 Metabolism and Weight Gain / Loss 00:06:48 Surprising Findings from The Biggest Loser Study 00:09:40 Evolutionary Perspective on Metabolic Slowing 00:11:55 Mechanisms Behind Metabolic Adaptation 00:13:30 Can We Control Our Metabolism? 00:15:05 Exercise, Nutrition Timing, and Metabolic Rate 00:21:01 Appetite, Calorie Compensation, and Weight Plateaus 00:25:08 AD BREAK 1 00:26:57 Calories In, Calories Out: Nuance and Complexity 00:31:14 Macronutrients, Diet Tribes, and Metabolic Ward Studies 00:35:02 Reductionism, Food Matrix, and Nutrition Complexity 00:41:17 Calorie Glut, Industrial Agriculture, and Food Waste 00:48:47 AD BREAK 2 00:57:51 Political Interference and NIH Research Challenges 01:05:10 Censorship, RFK Jr., and Ultra-Processed Food Research 01:09:02 Leaving NIH and Attempts to Reform Nutrition Research 01:16:10 Science vs. Rhetoric in Public Health Policy 01:20:29 Actionable Advice: Exercise, Weight Loss, and Metabolic Health 01:21:51 Fat Distribution, Visceral Fat, and Health 01:25:48 Precision Nutrition, Wearables, and Data Overload 01:30:39 Ultra-Processed Foods: Definitions and Consumer Guidance 01:40:40 Fiber, Protein, and the Pitfalls of Nutritional Reductionism 01:46:42 The Need for Better Nutrition Research Infrastructure CONNECT WITH RICH ✩ Website - http://richroll.com​ ✩ Rich Roll Podcast - https://richroll.com/all-episodes/ ✩ Instagram - https://www.instagram.com/richroll/ ✩ Twitter - https://twitter.com/richroll ✩ Facebook - https://www.facebook.com/richrollfans ✩ Strava - https://www.strava.com/athletes/14443?oq=rich ✩ Memoir: Finding Ultra - https://www.richroll.com/shop/books/finding-ultra/ ✩ Meals - http://meals.richroll.com​ ✩ Cook - The Plantpower Way - https://www.richroll.com/shop/books/the-plantpower-way-signed/ ✩ Italian! - The Plantpower Way: Italia - https://www.richroll.com/shop/books/the-plantpower-way-italia-signed/ ✩ Support - https://www.patreon.com/richroll Thanks To The Team: Jason Camiolo, Dan Drake, Morgan McRae, Blake Curtis, Desmond Loh * * * * * NEW TO RICH? Hi I'm Rich Roll. I'm a vegan ultra-endurance athlete, author, podcaster, public speaker & wellness evangelist. But mainly I'm a dad of four. If you want to know more, visit my website or check out these two the NY Times articles: http://bit.ly/otillonyt http://bit.ly/vegansglam I LOVE MAIL! SEND IT HERE: 2630 Conejo Spectrum St. Thousand Oaks, CA 91320 #richroll #richrollpodcast