AMA 04 - Cortisol, Seed Oils, Insulin, Biggest Loser and More

Protein Deep Dive

In this deep dive episode, Dr. Layne Norton breaks down everything you need to know about protein — from the molecular level to practical real-world application. We cover: • What protein actually is, how it’s made and broken down in the body • The complete science of muscle protein synthesis (MPS) and muscle protein breakdown (MPB), including the critical roles of mTORC1, leucine, eIF4E, 4E-BP1, and more • How dietary protein is digested, absorbed, and used by your muscles • Why leucine content matters and how different protein sources (whey vs. wheat vs. collagen) dramatically affect MPS • The “muscle full effect,” protein thresholds by age, and why protein distribution across meals may (or may not) matter • How high-protein diets impact fat loss, satiety, energy expenditure, and long-term body composition • The truth about protein and health outcomes: mortality, cardiovascular disease, cancer, kidney function, and type 2 diabetes — with the latest evidence separated from the hype and confounding factors Whether you’re a casual gym-goer, competitive athlete, bodybuilder, powerlifter, or just someone who wants to optimize muscle and health, this episode gives you the complete, evidence-based picture on protein intake, quality, timing, and safety. Plus, tips for vegans and how to actually use this information day-to-day. If you want to understand protein at a level most people (and even many coaches) never reach, this is the episode for you! #Protein #MuscleProteinSynthesis #HighProteinDiet #LayneNorton #EvidenceBasedNutrition #BodybuildingScience #FatLoss #MuscleBuilding SPONSORS • Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com [https://outworknutrition.com] • David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne [https://davidprotein.com/pages/layne] LAYNE'S COMPANIES Carbon Diet Coach: https://joincarbon.com/podcast [https://joincarbon.com/podcast] Outwork Nutrition: https://outworknutrition.com [https://outworknutrition.com] REPS Research Review: https://biolayne.com/reps [https://biolayne.com/reps] Workout Builder: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] Team Biolayne: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] Physique Coaching Academy: https://physiquecoachingacademy.com [https://physiquecoachingacademy.com] FOLLOW LAYNE http://www.facebook.com/laynenorton [https://www.facebook.com/laynenorton] http://www.twitter.com/biolayne [https://www.twitter.com/biolayne] http://www.instagram.com/biolayne [https://www.instagram.com/biolayne] TIMESTAMPS 0:00:00 - Intro 0:01:20 - Protein Chemistry Overview 0:16:15 - Outwork Nutrition 0:17:43 - Protein Digestion and Absorption 0:21:17 - How Protein Affects Muscle 0:37:00 - David Protein 0:38:35 - Protein Distribution 0:43:05 - Protein and Fat Loss 0:48:09 - Protein and Mortality 0:50:32 - Protein and Cardiovascular Disease 0:52:06 - Protein and Cancer 0:53:32 - Protein and Kidney Disease 0:56:38 - Protein and Type 2 Diabetes 0:57:53 - Recommendations 1:06:53 - Outro SHOW NOTES https://biolayne.com/podcasts/dr-layne-norton-podcast/protein-deep-dive-episode-29 [https://biolayne.com/podcasts/dr-layne-norton-podcast/protein-deep-dive-episode-29]

Seed Oils: The Evidence-Based Deep Dive

Are seed oils (and the polyunsaturated fats they contain) quietly destroying your health… or is the outrage mostly hype and misinformation? In this deep-dive episode, Dr. Layne Norton cuts through the noise with a comprehensive, evidence-first breakdown of the science on seed oils, linoleic acid (LA/PUFA), saturated fat, LDL/ApoB, oxidation, inflammation, and cardiovascular outcomes. Layne directly addresses the most common claims made by the anti-seed-oil crowd and shows why the totality of high-quality evidence—from mechanistic studies to randomized controlled trials and Mendelian randomization—supports replacing saturated fat with polyunsaturated fats from seed oils for better metabolic and heart health. What’s covered in this episode: • ApoB & LDL oxidation myth: Why PUFA-enriched LDL is more prone to oxidation per particle, but why that actually misses the bigger picture (lower LDL-P/ApoB, better clearance, less overall atherogenic burden in the arterial wall) • Human RCTs: A balanced review of the major trials (Minnesota Coronary Experiment, Sydney Diet Heart, LA Veterans, Oslo Diet-Heart, Finnish Mental Hospital, STARS, etc.)—including their real strengths, weaknesses, trans-fat confounds, and what the data actually show when you filter properly • Mendelian Randomization evidence: Why lifelong lower LDL/ApoB causally reduces CVD risk regardless of how it’s lowered, and why ApoB/LDL particle number is the key driver (not just LDL-C) • The Linoleic Acid (LA) hypothesis: Does more LA → more arachidonic acid → more inflammation, T2D, CVD, and cancer? Layne examines the actual human data on tissue levels, prostaglandin synthesis, systemic inflammation markers, insulin sensitivity, and disease outcomes • Seed oil processing & refining: Hexane, neutralization, bleaching, deodorization—why the “chemical” scare tactics don’t hold up, peroxide/anisidine values actually drop during refining, and why the final product is far safer and cleaner than the fear-mongering suggests • Naturalistic fallacy & miscellaneous claims: Why “our ancestors didn’t eat seed oils” isn’t a compelling argument, plus other common talking points Whether you’re team butter, team vegetable oil, or just tired of the tribal nutrition wars, this episode gives you the full context and references so you can make up your own mind based on science instead of social media soundbites. #SeedOils #PUFA #HeartHealth #Cholesterol #EvidenceBased #LayneNorton #NutritionScience #SaturatedFat #LinoleicAcid #CardiovascularHealth SPONSORS • David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne [https://davidprotein.com/pages/layne] • Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast [https://joincarbon.com/podcast] LAYNE'S COMPANIES Carbon Diet Coach: https://joincarbon.com/podcast [https://joincarbon.com/podcast] Outwork Nutrition: https://outworknutrition.com [https://outworknutrition.com] REPS Research Review: https://biolayne.com/reps [https://biolayne.com/reps] Workout Builder: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] Team Biolayne: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] Physique Coaching Academy: https://physiquecoachingacademy.com [https://physiquecoachingacademy.com] FOLLOW LAYNE http://www.facebook.com/laynenorton [https://www.facebook.com/laynenorton] http://www.twitter.com/biolayne [https://www.twitter.com/biolayne] http://www.instagram.com/biolayne [https://www.instagram.com/biolayne] TIMESTAMPS 0:00:00 - Intro 0:02:21 - Personal Bias 0:03:42 - Arguments Against Seed Oils 0:05:33 - Fatty Acid Structure 0:08:31 - Prostaglandin Pathway 0:09:09 - Current Health Advice 0:10:03 - LDL Cholesterol 0:12:42 - Specific Question 0:13:57 - Human Trials 0:16:10 - David Protein 0:17:45 - Sydney Heart Study 0:22:22 - Minnesota Coronary Experiment 0:25:09 - Rose Corn Oil Trial 0:27:29 - LA Veterans Study 0:29:20 - Finnish Mental Hospital Study 0:31:51 - STARS 0:33:48 - Carbon Diet Coach 0:34:48 - Analysis of Human RCTs 0:35:57 - Mendelian Randomization 0:44:15 - LDL Cholesterol and ApoB 0:51:49 - Oxidation 0:58:54 - Linoleic Acid 1:02:02 - Seed Oil Processing 1:10:06 - Frying in Seed Oils 1:10:54 - Naturalistic Fallacy 1:13:11 - Summary SHOW NOTES https://biolayne.com/podcasts/dr-layne-norton-podcast/seed-oils-the-evidence-based-deep-dive-episode-28 [https://biolayne.com/podcasts/dr-layne-norton-podcast/seed-oils-the-evidence-based-deep-dive-episode-28]

Bill Campbell: The Physique Enhancement Professor

In this episode, Dr. Layne Norton sits down with Professor Bill Campbell, PhD — Director of the Performance & Physique Enhancement Laboratory at the University of South Florida and a leading researcher on body composition, high-protein diets, and resistance training adaptations. They discuss Bill’s high-protein studies in women (including physique athletes, contest prep, older adults, and time-restricted eating), sex differences in muscle growth and training adaptations, the menstrual cycle’s impact on performance, intermittent energy restriction, refeeds and diet breaks, and one major belief he completely changed his mind on (meal frequency). Packed with practical, evidence-based insights on optimizing body composition, fat loss, and strength. SPONSORS • Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] • Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] LAYNE'S COMPANIES Carbon Diet Coach: https://joincarbon.com/podcast [https://joincarbon.com/podcast] Outwork Nutrition: https://outworknutrition.com [https://outworknutrition.com] REPS Research Review: https://biolayne.com/reps [https://biolayne.com/reps] Workout Builder: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] Team Biolayne: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] Physique Coaching Academy: https://physiquecoachingacademy.com [https://physiquecoachingacademy.com] FOLLOW LAYNE http://www.facebook.com/laynenorton [https://www.facebook.com/laynenorton] http://www.twitter.com/biolayne [https://www.twitter.com/biolayne] http://www.instagram.com/biolayne [https://www.instagram.com/biolayne] TIMESTAMPS 0:00:00 - Intro 0:02:53 - Career History 0:10:58 - What is the Focus of Your Lab? 0:15:48 - Physique Coaching Academy 0:16:49 - High vs Low Protein Study 0:36:45 - REPS Research Review 0:40:19 - Animal vs Human Studies 0:43:22 - Importance of Leucine 0:45:55 - Arginine & Growth Hormone 0:49:14 - Should Women Train Differently 0:54:34 - Device Trackers vs Subjective Feelings 0:57:38 - Squats 1:04:48 - Injuries 1:07:41 - Training Volume 1:13:30 - Refeeds and Diet Breaks 1:32:32 - Meal Frequency 1:36:25 - Outro SHOW NOTES https://biolayne.com/podcasts/dr-layne-norton-podcast/the-physique-enhancement-professor-with-bill-campbell-episode-27 [https://biolayne.com/podcasts/dr-layne-norton-podcast/the-physique-enhancement-professor-with-bill-campbell-episode-27]

AMA 04 - Cortisol, Seed Oils, Insulin, Biggest Loser and More

In this listener Q&A, Layne dives deep into your most-asked questions on training, nutrition, and practical science. As always, he breaks down the actual research and gives no-BS, evidence-based takeaways you can actually use. Topics covered in this episode: • Does cortisol cause fat gain? Plus the impact of low-calorie dieting on cortisol • Sucralose and gut health – new research on dysbiosis, glucose/insulin levels, and the role of Blautia • Do seed oils increase inflammation? Comprehensive look at linoleic acid studies, systematic reviews, and clinical trials • Insulin, high-glycemic carbs, and fat storage – what do overfeeding studies actually show? • Is “natural” always better? The naturalistic fallacy explained • Is resistance training safe and effective for kids? What the science says for youth training • Creatine dosing for women vs. men – do women need a different amount? • Does cardio interfere with building muscle? Latest meta-analyses on concurrent training • Layne’s honest take on The Biggest Loser Netflix documentary • And more! Whether you’re chasing muscle gains, fat loss, or just cutting through the noise, this episode delivers the science-backed answers. SPONSORS • REPS - Research Explained in Practical Summaries: https://biolayne.com/reps [https://biolayne.com/reps] • Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] LAYNE'S COMPANIES Carbon Diet Coach: https://joincarbon.com/podcast [https://joincarbon.com/podcast] Outwork Nutrition: https://outworknutrition.com [https://outworknutrition.com] REPS Research Review: https://biolayne.com/reps [https://biolayne.com/reps] Workout Builder: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] Team Biolayne: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] Physique Coaching Academy: https://physiquecoachingacademy.com [https://physiquecoachingacademy.com] FOLLOW LAYNE http://www.facebook.com/laynenorton [https://www.facebook.com/laynenorton] http://www.twitter.com/biolayne [https://www.twitter.com/biolayne] http://www.instagram.com/biolayne [https://www.instagram.com/biolayne] TIMESTAMPS 0:00:00 - Intro 0:01:08 - Bulking/Cutting vs Recomp? 0:08:00 - Does Cortisol Cause Fat Gain? 0:11:51 - REPS Research Review 0:12:41 - Does Sucralose Harm Your Gut? 0:15:42 - Do Seed Oils Cause Inflammation? 0:21:24 - Insulin and Fat Storage? 0:25:48 - Workout Builder 0:26:43 - Is Natural Always Better? 0:31:42 - Can Women Over 60 Grow Their Glutes? 0:33:31 - Is Resistance Training Healthy for Kids? 0:35:53 - Dosing Creatine for Women vs Men? 0:37:00 - Stacy Sims Content? 0:40:30 - Alcohol and Body Composition? 0:42:45 - Does Cardio Interfere with Building Muscle? 0:45:57 - Thoughts on New Biggest Loser Documentary? 0:54:04 - Outro SHOW NOTES https://biolayne.com/podcasts/dr-layne-norton-podcast/ama-04-cortisol-seed-oils-insulin-biggest-loser-and-more-episode-26

Blood Flow Restriction Training with Jeremy Loenneke

In this episode, Dr. Layne Norton interviews Professor Jeremy Loenneke — one of the world’s top researchers on blood flow restriction training. They break down how BFR actually works, why metabolite accumulation appears to be the primary driver of its muscle-building effects, practical self-application techniques, and whether expensive cuffs are even necessary. Jeremy also shares his latest thinking on the hypertrophy vs. strength relationship, why muscle may be an underrated health marker (just like fat once was), his biggest concerns about the replication crisis in exercise science, and how he responds to critics who call BFR “gimmicky.” Whether you’re an athlete chasing gains, a coach, or just training smarter, this is a must-listen deep dive into the science and real-world application of BFR. SPONSORS • Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] • Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] LAYNE'S COMPANIES Carbon Diet Coach: https://joincarbon.com/podcast [https://joincarbon.com/podcast] Outwork Nutrition: https://outworknutrition.com [https://outworknutrition.com] REPS Research Review: https://biolayne.com/reps [https://biolayne.com/reps] Workout Builder: https://biolayne.com/workout-builder [https://biolayne.com/workout-builder] Team Biolayne: https://biolayne.com/online-coaching [https://biolayne.com/online-coaching] Physique Coaching Academy: https://physiquecoachingacademy.com [https://physiquecoachingacademy.com] FOLLOW LAYNE http://www.facebook.com/laynenorton [https://www.facebook.com/laynenorton] http://www.twitter.com/biolayne [https://www.twitter.com/biolayne] http://www.instagram.com/biolayne [https://www.instagram.com/biolayne] TIMESTAMPS 0:00:00 - Intro 0:05:27 - Background on BFR 0:12:30 - BFR Effects 0:18:38 - BFR Protocols 0:23:18 - Workout Builder 0:24:14 - Preferences = Consistency 0:28:36 - BFR and Injuries 0:31:39 - BFR vs Regular Training 0:41:57 - Mechanisms 1:04:51 - Team Biolayne 1:05:43 - Training to Failure 1:10:50 - Don’t Get Stuck in the Details 1:16:35 - BFR Safety 1:20:41 - Recommendations to Start 1:27:30 - Strength vs Hypertrophy 1:49:58 - Study Design & Replication 2:04:14 - Final Question 2:15:52 - Outro SHOW NOTES https://biolayne.com/podcasts/dr-layne-norton-podcast/