The Dr. Layne Norton Podcast

Is insulin really the root cause of fat gain? Or has the carbohydrate-insulin model of obesity been oversold?

In this episode, Dr. Layne Norton breaks down what insulin actually does in the body, why short-term biochemistry snapshots don’t tell the whole story, and what the highest-quality human evidence really shows about low-carb vs. low-fat diets when calories and protein are controlled.

We cover metabolic ward trials, meta-analyses of controlled feeding studies, overfeeding research, and why GLP-1 drugs (which increase meal insulin) produce massive fat loss. Spoiler: insulin is not a wizard that can violate thermodynamics.

#Insulin #LowCarb #Obesity #CarbohydrateInsulinModel #LayneNorton #EvidenceBased #FatLoss #NutritionScience #KevinHall #DIETFITS #GLP1 #Semaglutide #Tirzepatide

SPONSORS

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:43 - What is Insulin

0:07:26 - Insulin and Fat Tissue

0:11:02 - Carbohydrate Insulin Model of Obesity

0:15:08 - Carbon Diet Coach

0:16:09 - What the Evidence Shows

0:31:58 - Team Biolayne

0:32:49 - Overfeeding

0:37:52 - Population Studies

0:43:05 - GLP1 Agonists

0:45:09 - Mechanisms

0:48:35 - Type 2 Diabetes

0:50:24 - Ludwig Study

0:52:41 - Misc Arguments

0:55:18 - Summary

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast

In the latest episode of his Overrated/Underrated series, Dr. Layne Norton ranks the habits, markers, and gadgets the longevity and biohacker crowd won’t stop talking about. No hype. No bro-science. Just what the data actually says about what predicts a longer life, and what has been oversold as a hack.

Topics covered: VO2 max, grip strength, cold plunges, sauna, sleep trackers, muscle mass, fasting, biological age tests, and more!

Tune in for evidence-based analysis and practical tips on what actually moves the needle for better health and longevity.

#LayneNorton #Biolayne #Longevity #Biohacking

SPONSORS

• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:00:49 - V02 Max

0:02:16 - Grip Strength

0:04:08 - Muscle Mass

0:05:24 - 10k Steps Per Day

0:06:16 - David Protein Promo

0:08:23 - Zone 2 Cardio

0:09:00 - Cold Plunges

0:11:20 - Sauna

0:11:59 - Sleep Trackers

0:13:39 - Fasting

0:15:38 - Calorie Restriction

0:18:07 - Biolayne Coaching Promo

0:19:05 - Biological Age Tests

0:20:06 - Full Body MRI

0:22:10 - ApoB

0:24:52 - Annual Bloodwork

0:26:03 - Stress Management

0:29:44 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/overrated-underrated-longevity-biohacking-episode-38/

Detoxes. Seed oils. Cortisol making you fat. Artificial sweeteners causing weight gain. Insulin as the root of obesity. Hormones as the master switch for fat loss.

These ideas keep spreading — even among smart, educated people who should know better. In this episode, Dr. Layne Norton explains why.

This is not just another myth-busting list. It’s a breakdown of the psychology, incentives, and media dynamics that make fitness misinformation so sticky. Layne covers why the human brain was not built for science, why anecdotes beat statistics, why fear sells better than nuance, how algorithms reward certainty and outrage, and why intelligence does not protect you from bias.

You’ll also get a practical toolkit for evaluating claims: what questions to ask, which red flags matter, how the hierarchy of evidence actually works, and why the “big rocks” of health still outperform the latest viral villain.

If you’ve ever wondered why bad fitness ideas travel faster than good evidence, this episode is the map.

#LayneNorton #FitnessMisinformation #EvidenceBasedFitness #NutritionScience #Biolayne #SeedOils #ArtificialSweeteners #CriticalThinking #HealthMyths #DrLayneNortonPodcast

SPONSORS

• REPS Research Review: https://biolayne.com/reps

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:01:37 - The Misinformation Epidemic

0:08:14 - Human Brains Were Not Designed For Science

0:26:01 - The Power of Anecdotes

0:36:17 - Fear as a Marketing Tool

0:41:04 - Social Media and the Algorithm

0:48:01 - Why Smart People are Vulnerable

0:58:30 - The Business of Misinformation

1:03:16 - How Science Actually Works

1:08:48 - A Toolkit for Evaluating Claims

1:15:20 - Conclusion: The Big Rocks Matter Most

1:17:28 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/the-science-of-fitness-misinformation-why-smart-people-believe-dumb-things-episode-37

In this listener Q&A, Dr. Layne Norton answers your most-asked questions on training, fat loss, genetics, recovery, and how to cut through the noise — with his kitten Wheezy as co-host.

Topics covered in this episode:

• Training to failure — is it more important for advanced lifters than beginners?

• Muscle confusion — why constantly changing exercises creates the illusion of progress (and how much variety is actually useful)

• Muscle mass and longevity — is there a point where more muscle stops helping, and why extreme muscularity can look like a U-shaped curve

• “I barely eat anything but I’m not losing weight” — why feelings aren’t data, food volume vs calorie density, and why one week of tracking changes everything

• Ultra-processed foods — do they cause more fat gain than minimally processed foods when calories are matched?

• Metabolic adaptation — how reversible is it, what’s transient vs what’s tied to lost lean mass, and what happens if you stay at the new body weight

• How to know who to trust — look for nuance, people who change their minds, logical consistency, and those who haven’t made a diet their identity

• Smartwatch recovery scores & HRV — why you should not change your training based on a single day’s number

• “Do I have bad genetics?” — Layne’s 10-year answer, chicken-leg-to-world-record-squat story, and the motto “let’s find out”

• What Layne loves (and hates) most about his job

And more!

Whether you’re stuck on fat loss, second-guessing your program, or tired of conflicting advice, this episode gives practical, no-BS takeaways you can use.

#BioLayne #LayneNorton #QandA #AMA #EvidenceBasedNutrition #TrainingToFailure #MetabolicAdaptation #FatLoss #MuscleBuilding #Genetics #HRV

SPONSORS

• Physique Coaching Academy - Advanced Coaching and Nutrition Education for Personal Trainers: https://physiquecoachingacademy.com

• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:00:55 - Training to Failure

0:02:58 - Muscle Confusion

0:05:06 - Muscle Mass for Longevity

0:07:05 - Physique Coaching Academy

0:08:06 - Hard Time Losing Weight

0:09:48 - Processed Food

0:11:24 - Metabolic Adaptation

0:12:58 - Who to Trust

0:18:55 - Wearables

0:21:13 - Workout Builder

0:22:08 - Good Genetics

0:27:02 - Love/Hate Most About My Job

0:30:17 - Training Evolution

0:32:55 - Quitting vs Letting Go

0:35:55 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/ama-06-weight-loss-genetics-muscle-confusion-who-to-trust-and-more-episode-36

In the second installment of the Overrated/Underrated series, Dr. Layne Norton ranks the most talked-about muscle-building strategies as overrated, underrated, or properly rated — based purely on the evidence.

No hype. No bro-science. Just what the data actually says about what builds muscle, what doesn’t, and what’s been oversold.

Layne covers training intensity, proximity to failure, volume, rep ranges, range of motion, exercise selection, muscle confusion, protein timing, post-workout nutrition, and more! He also explains why he recently changed his mind on calorie surplus, why most people are not training as close to failure as they think, and why stretch/lengthened-position tension matters more than most lifters realize.

Whether you’re a coach, athlete, or just trying to build muscle efficiently, this episode cuts through the noise so you can stop wasting time on the overrated stuff and double down on what actually moves the needle.

#musclebuilding #hypertrophy #evidencedbasedfitness #DrLayneNorton #Biolayne

SPONSORS

• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:00:43 - Training Intensity

0:05:34 - Training to Failure

0:07:04 - Training Volume

0:09:07 - Rep Ranges

0:12:19 - Workout Builder

0:13:16 - Range of Motion

0:15:31 - Exercise Selection

0:18:02 - Muscle Confusion

0:19:29 - Tempo

0:20:54 - Training Frequency

0:22:13 - Protein Intake

0:22:54 - Carbohydrates

0:24:12 - Outwork Nutrition

0:25:39 - Fats

0:27:02 - Calorie Surplus

0:27:36 - Protein Timing

0:28:38 - Protein Quality

0:30:12 - Recomposition

0:32:15 - Post-Workout Nutrition

0:33:28 - Creatine

0:35:19 - Testosterone Boosters

0:35:51 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/overrated-underrated-muscle-building-edition-episode-35

In this episode of the Dr. Layne Norton Podcast, Layne sits down with renowned researcher and ketogenic diet expert Dr. Dominic D’Agostino to dive deep into the science of the ketogenic diet. Professor Dominic D’Agostino (University of South Florida Morsani College of Medicine / Institute for Human and Machine Cognition) is one of the leading voices on nutritional ketosis, exogenous ketones, and metabolic therapies. Together, they unpack what the research actually shows about keto – beyond the hype and social media claims.

They cover the mechanisms of ketosis, potential therapeutic applications (including epilepsy, metabolic health, neurological conditions, and ongoing research areas like cancer support), practical considerations for implementing a well-designed ketogenic approach, common misconceptions, protein and micronutrient needs, exogenous ketones, and how keto stacks up for fat loss, performance, and long-term adherence compared to other dietary strategies. Expect an evidence-based, no-BS conversation that prioritizes data over dogma.

#KetogenicDiet #Keto #DominicDAgostino #LayneNorton #NutritionScience #MetabolicHealth #EvidenceBasedNutrition #DrLayneNortonPodcast

SPONSORS

• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne

• REPS Research Review: https://biolayne.com/reps

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:37 - Dom's Background

0:05:57 - Ketones and Seizures

0:15:23 - Animal Research

0:18:42 - David Protein

0:20:17 - Mechanisms of Ketone Therapy

0:28:07 - Magnesium

0:29:12 - Dementia/Alzheimers

0:37:55 - Cancer

0:45:38 - REPS Research Review

0:46:29 - Cancer Cont.

1:16:50 - Muscle Hypertrophy

1:27:55 - Fasting

1:38:33 - Training

2:01:42 - Ranking Importance

2:04:34 - Last Question

2:20:13 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/the-ketogenic-diet-with-dr-dominic-dagostino-episode-34

In the first installment of a new series, Dr. Layne Norton ranks the most talked-about fat-loss strategies as overrated or underrated, based purely on the evidence. No hype. No bro-science. Just what the data actually says about what works, what doesn’t, and what’s been oversold.

Topics covered:

• Fasting

• Low-carb diets

• Whole foods

• Carbs at night

• Cardio

• Resistance training

• Circuit training classes

• Diet breaks

• Protein intake

• Meal timing & frequency

• Artificial sweeteners

• Weighing yourself consistently

• GLP-1s

• Fat burners

Layne breaks down the key studies, clarifies common misconceptions, and gives practical takeaways so you can stop wasting time on the overrated stuff and double down on what actually moves the needle. Whether you’re a coach, athlete, or just trying to lose fat efficiently, this episode cuts through the noise.

#WeightLossScience #FatLoss #DietBreaks #EvidenceBasedNutrition #DrLayneNorton #Biolayne #NutritionScience

SPONSORS

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:01:27 - Fasting

0:07:16 - Low Carb Diets

0:09:51 - Team Biolayne Coaching

0:10:41 - Whole Foods

0:12:24 - Carbs at Night

0:14:34 - Cardio

0:16:05 - Resistance Training

0:17:52 - Circuit/Group Training

0:18:44 - Diet Breaks

0:20:38 - REPS Research Review

0:21:28 - Protein

0:23:53 - Meal Timing

0:24:31 - Artificial Sweeteners

0:31:10 - Weighing Yourself

0:33:07 - GLP1s

0:38:13 - Fat Burners

0:39:11 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/overrated-underrated-fat-loss-edition-episode-33

In this episode, I sit down with Dr. Mike Ormsbee, Director of the Institute of Sports Science and Medicine at Florida State University. Mike is one of the sharpest, most pragmatic researchers in the field — a former hockey player turned leading expert on exercise, nutrition, fat metabolism, sleep, and performance.

We had an absolute blast geeking out for nearly two hours. Mike and I share very similar backgrounds (athletes who got into lifting and science for selfish reasons — getting jacked and lean), and it shows in how practical and grounded this conversation is.

What we covered:

• Mike’s journey from competitive ice hockey and early bodybuilding days to becoming a professor and running one of the top sports nutrition labs in the country

• Resistance training vs. endurance exercise for fat metabolism (what the cellular data actually shows)

• Mechanisms vs. real-world outcomes in fat loss

• Pre-sleep nutrition: Does eating protein (or anything) before bed ruin fat loss, sleep, or recovery?

• Interpreting science, research biases, publication issues, and why “what works for you” still matters

We also had some friendly disagreement on collagen, which I think you’ll really enjoy.

If you want evidence-based, no-BS discussion on training, nutrition timing, supplements, and how to actually apply the science to real life (whether you’re an athlete or just trying to stay healthy and jacked), this one is for you.

#DrLayneNorton #MikeOrmsbee #SportsNutrition #ResistanceTraining #PreSleepProtein #Collagen #FatMetabolism #EvidenceBasedFitness

SPONSORS

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:47 - Mike's Background

0:06:12 - The Start of Resistance Training Research

0:10:38 - Fat Metabolism

0:17:35 - Lipolysis vs Fat Loss

0:21:40 - Outwork Nutrition

0:23:08 - Research Considerations

0:28:45 - Hard Training Above All

0:33:16 - Risk Probabilities

0:35:10 - Sleep Nutrition Research

0:44:06 - Workout Builder

0:45:02 - Sleep Nutrition Research Cont.

0:45:50 - Practical Takaways

0:47:30 - Performance Outcomes

0:49:07 - Study Design Evolution

0:52:06 - Wearables

0:56:51 - Missing Sleep and Sleep Schedules

1:07:31 - Training or Competing at Night

1:11:11 - Nutrient Timing

1:18:01 - Carbs and Exercise Performance

1:31:27 - Collagen

1:42:47 - Research Discussion

1:49:46 - Final Question

1:59:47 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/sports-nutrition-performance-with-mike-ormsbee-episode-32

In this episode, Dr. Layne Norton delivers a comprehensive, evidence-based breakdown of metabolic adaptation — one of the biggest reasons why fat loss slows down and maintaining weight loss feels so difficult.

Layne explains exactly what metabolic adaptation is, how it affects every major component of energy expenditure (BMR, NEAT, exercise energy expenditure, and TEF), and the powerful neuroendocrine and behavioral changes that create an “energy gap” driving weight regain from both sides of the calorie equation.

He also covers the under-discussed adaptations in hunger hormones (leptin, ghrelin, GLP-1, PYY, CCK, etc.), brain responses to food, adipose tissue changes that favor fat storage, and whether rapid refeeding can increase fat cell number. The episode finishes with practical, research-backed strategies to minimize these adaptations and common myths (including whether “starvation mode” is real).

Whether you’re currently cutting, planning a fat loss phase, or struggling with weight maintenance, this episode will give you a clear scientific understanding of what’s happening in your body and how to work with these adaptations more effectively.

#MetabolicAdaptation #WeightLossScience #FatLoss #TDEE #BMR #NEAT #Leptin #Ghrelin #DietBreaks #EvidenceBasedNutrition #DrLayneNorton #Biolayne #NutritionScience

SPONSORS

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:50 - What is Metabolic Adaptation

0:06:18 - Components of TDEE

0:12:38 - BMR

0:27:22 - NEAT

0:31:10 - Exercise Expenditure

0:34:44 - TEF

0:35:16 - Leptin and Appetite

0:36:35 - Hormones

0:42:05 - Changes to the Brain

0:49:36 - The Energy Gap

0:50:17 - Changes to Adipose Tissue

0:57:44 - Rapid Regain After Weight Loss

1:03:04 - How to Minimize Metabolic Adaptation

1:10:57 - Myths

1:15:48 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/metabolic-adaptation-episode-31

In this listener Q&A, Layne dives deep into your most-asked questions on supplements, protein sources, cholesterol, weight-loss medications, and more. As always, he breaks down the actual research and gives no-BS, evidence-based takeaways you can actually use.

Topics covered in this episode:

• Creatine HCl – Supplementing with which form of creatine (hydrochloride vs others)? What does the research actually show?

• David Protein Bars – Thoughts on the lawsuit and bars failing label tests (lawsuit update included)

• Plant proteins & amino acids – Do they really miss certain essential amino acids? Should it fully count toward your total daily protein intake?

• Ashwagandha safety – Should you be worried about liver toxicity?

• Collagen supplements – Benefits for tendons, joints, injury recovery, and connective tissue (even if it’s not great for muscle building)

• Dietary fiber – Why it’s important for health and practical ways to get more (supplements vs whole foods)

• LDL cholesterol – Oxidized LDL and particle size: what actually matters and why the debate exists

• GLP-1 medications – Are they just a “quick fix”? Willpower, muscle loss concerns, and what happens with weight regain after stopping

• And more!

Whether you’re optimizing your supplement stack, navigating plant vs animal protein debates, or curious about the latest on GLP-1s and cholesterol, this episode delivers clear, science-backed answers.

#BioLayne #LayneNorton #QandA #AMA #EvidenceBasedNutrition #Creatine #PlantProtein #Ashwagandha #Collagen #DietaryFiber #LDLCholesterol #GLP1 #Ozempic #NutritionScience

SPONSORS

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

• REPS - Research Explained in Practical Summaries: https://biolayne.com/reps

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:00:39 - Creatine HCL

0:06:24 - David Protein Lawsuit

0:10:59 - Team Biolayne Coaching

0:11:50 - Plant Protein Amino Acids

0:14:24 - Plant Protein Total Protein Intake

0:16:43 - Ashwagandha Liver Toxicity

0:19:10 - Collagen

0:25:16 - Fiber

0:34:19 - REPS Research Review

0:35:09 - LDL Cholesterol

0:47:29 - GLP1's

0:57:04 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/ama-05-creatine-plant-protein-collagen-fiber-glp1s-and-more-episode-30

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

• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.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

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

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.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

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

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.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

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

• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.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

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

• Team Biolayne – One-On-One Coaching: https://biolayne.com/online-coaching

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.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/

It’s here—the last episode of Dr. Layne Norton’s no-nonsense supplement series! In this finale, Layne takes a hard, evidence-based look at some of the most overhyped supplements in fitness and bodybuilding. He cuts through the marketing claims, examines the actual research, and tells you exactly what works, what doesn’t, and who (if anyone) should actually be spending money on these products.

In this episode, Layne covers:

• BCAAs – Do they build muscle, boost strength, or speed recovery more than just eating enough total protein?
• HMB – Why the “like deca” claims from the ’90s never panned out, and what it actually does (and doesn’t) do
• Glutamine & Arginine – Poor bioavailability, gut-first metabolism, and why they rarely deliver the muscle-building or performance benefits promised
• Ecdysterone & Turkesterone – The “natural steroid” hype meets high-quality human RCTs
• Electrolytes – When they actually matter (and when plain water is sufficient)
• “Better” Creatine forms (CEE, buffered creatine, HCl, etc.) vs. good old Creatine Monohydrate – spoiler: you’re usually just paying 2–4× more for the same (or worse) results

Layne breaks down the bold claims vs. reality for each supplement, explains what the science shows they actually do in the body, and identifies the very narrow populations who might see real benefit.

Stop wasting money on supplements that underdeliver. Focus on what actually moves the needle.

SPONSORS

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:03:10 - BCAAs

0:11:38 - HMB

0:19:46 - Glutamine

0:24:56 - Arginine

0:31:10 - Ecdysterone and Turkesterone

0:34:18 - Electrolytes

0:42:32 - Alternate Forms of Creatine

0:51:03 - Honorable Mentions

0:55:42 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/the-most-overhyped-supplements-of-all-time-episode-24

The Dr. Layne Norton Podcast is back with Part 2 of the highly anticipated Supplement Series! In Episode 23, Layne dives deep into his Tier 2 supplements — the ones with solid (but not quite elite) evidence for supporting strength, power, endurance, recovery, body composition, stress management, sleep, and overall training performance.

Building on the Tier 1 foundations from Episode 22 (creatine, whey protein, and caffeine), Layne breaks down the science, mechanisms, optimal dosing, timing, safety profiles, and real-world takeaways for these promising options. No hype, just evidence-based insights to help you decide what's worth adding to your stack.

In this episode, Layne covers:

Ashwagandha — Boosts strength, lean mass, testosterone, recovery, sleep, and stress management as a powerful adaptogen.

Betaine (Trimethylglycine) — Potential improvements in body composition, strength, power output, and recovery.

Rhodiola Rosea — Enhances resistance training performance, endurance, VO2 max, fatigue resistance, recovery, and cognition.

Citrulline (including Citrulline Malate) — Increases muscular endurance, reps to failure, nitric oxide production, and reduces fatigue.

Beta-Alanine — Buffers acidity for better performance in high-intensity efforts (1–10 minutes), more reps in resistance training.

Tart Cherry Extract — Reduces DOMS, speeds strength/power recovery, and lowers inflammation/oxidative stress markers.

Melatonin — Improves sleep quality (with indirect benefits for body composition and recovery via better rest).

Taurine — Supports endurance, acute power/strength, and recovery from muscle damage/DOMS.

Carnitine — Aids recovery, reduces soreness, boosts power/volume, and may enhance high-intensity performance.

Magnesium — Benefits exercise performance, recovery, and sleep — especially if you're deficient.

Layne references key studies, meta-analyses, practical dosing protocols, side effects to watch for, and who might benefit most.

Whether you're chasing PRs, better recovery, or optimized health, this episode cuts through the supplement noise with Layne's no-BS, science-first approach.

SPONSORS

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:04:05 - Conflict of Interest

0:05:17 - Ashwagandha

0:13:52 - Outwork Nutrition

0:15:28 - Betaine

0:20:59 - Rhodiola Rosea

0:25:04 - Citrulline

0:30:46 - David Protein

0:32:21 - Beta-Alanine

0:37:26 - Tart Cherry

0:42:18 - Melatonin

0:45:24 - Taurine

0:47:24 - L-Carnitine

0:51:35 - Magnesium

0:54:34 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/supplement-series-tier-2-episode-23

The Dr. Layne Norton Podcast is back with the start of a brand-new Supplement Series! In Episode 22, Layne kicks things off by diving deep into his Tier 1 supplements — the ones with the strongest scientific evidence for real-world benefits in performance, body composition, strength, recovery, and even cognition.

This episode covers the true MVPs that Layne considers essential (or close to it) for most people training hard:

Creatine Monohydrate — Why it's called the most effective ergogenic aid ever, how it boosts lean mass, strength, repeated sprint/power performance, and even helps cognition (especially under stress like sleep deprivation). We bust myths about kidneys, water retention, and non-responders, plus practical dosing (5 g/day, loading optional).

Whey Protein — The gold-standard for hitting leucine thresholds and maximizing muscle protein synthesis. How it supports lean mass gains, preserves muscle in a deficit, improves recovery and training volume over time — and why total daily protein matters way more than perfect timing.

Caffeine — One of the most reliable acute performance boosters out there. It cranks up strength, power, endurance, repeated sprints, alertness, and reduces perceived effort — especially when fatigued. We cover optimal dosing (3–6 mg/kg), timing, habituation, sleep trade-offs, and who should be cautious.

Layne breaks down the mechanisms, key meta-analyses, practical takeaways, dosing/timing strategies, safety profiles, and who might need to be careful with each one. No hype, no BS — just evidence-based insights to help you cut through the supplement noise.

SPONSORS

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

• Carbon Diet Coach – 14 day free trial: https://joincarbon.com/podcast

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:01:24 - Tier 1 Supplement List

0:02:25 - Industry Shenanigans

0:04:01 - Tier 1 Criteria

0:04:56 - Conflicts of Interest

0:09:10 - How Creatine Works

0:13:09 - Creatine Physical Benefits

0:19:55 - Outwork Nutrition

0:21:22 - Creatine Physical Benefits Contd.

0:23:48 - Creatine Cognitive Benefits

0:27:23 - Creatine Safety

0:30:51 - Forms of Creatine

0:32:18 - How to Take Creatine

0:34:15 - Creatine Non-Responders

0:35:19 - Misc Considerations

0:36:11 - Whey Protein Quality

0:38:04 - Muscle Protein Synthesis

0:39:09 - Whey Protein Research

0:40:00 - Protein Intake

0:42:27 - Protein Health and Safety

0:43:16 - Forms of Whey Protein

0:47:13 - Whey Protein Dosing

0:49:05 - Misc Considerations

0:50:42 - Carbon Diet Coach

0:51:42 - How Caffeine Works

0:53:23 - Research Outcomes

0:57:03 - Timing/Dosing

0:57:30 - Cognitive Effects

0:58:06 - Health Considerations

0:58:57 - Training Recommendations

1:00:44 - More Dosing

1:03:11 - Caffeine + Creatine

1:04:18 - Misc Considerations

1:05:10 - Closing Thoughts

1:06:21 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/supplement-series-tier-1-episode-22

In this episode, I’m joined by James Krieger, editor of REPS (Research Review for Exercise & Physique Science), to break down what the meta-analyses really say about building muscle.

We cover:

• The single most important driver of hypertrophy

• The dose–response relationship between volume and muscle growth

• Is there a cap to effective volume?

• Training to failure: necessary or overrated?

• Frequency: how often should you train a muscle?

• Stretch-mediated hypertrophy and long-length partials

• Why some volume studies appear to “disagree”

If you’re tired of social media hot takes and want to understand what the totality of evidence actually shows, this episode is for you.

James and I also discuss how we evaluate research quality and why context matters when interpreting studies, something we do every month inside the issues of REPS, where we break down the latest exercise and physique research so you don’t have to.

If you want deeper dives into the actual studies discussed in this episode (and many more), check out REPS at https://biolayne.com/reps

SPONSORS

• REPS - Research Explained in Practical Summaries: https://biolayne.com/reps

• Workout Builder – Customized training programs for all experience levels: https://biolayne.com/workout-builder

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:39 - James Background

0:04:01 - OG Message Boards

0:06:24 - Who To Listen To

0:15:01 - REPS

0:15:53 - Hypertrophy

0:26:02 - Compound vs Isolation Movements

0:33:05 - Subjective Feelings on Training

0:37:50 - Training Flexibility

0:43:22 - Training Volume

0:47:05 - Defining Sets

0:51:59 - Volume Analysis

1:02:27 - Research Challenges

1:08:12 - Workout Builder

1:09:08 - Study Discrepancies

1:16:55 - High vs Low Volume

1:22:40 - Time Constraints

1:25:15 - Volume Cycling

1:30:11 - Volume Adaptation

1:34:37 - Range of Motion

1:44:35 - What Have You Changed Your Mind On

1:59:36 - Outro

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/the-science-of-muscle-building-with-james-krieger-episode-21

In this episode, Layne Norton, PhD, dissects the landmark 2025 systematic review & meta-analysis in Advances in Nutrition: "The Effects of Aspartame on Glucose, Insulin, and Appetite-Regulating Hormone Responses in Humans". (PMID: 40381807)

This episode is perfect if you've heard claims like "diet soda spikes insulin," "artificial sweeteners cause diabetes," or "aspartame is toxic" — Layne uses this gold-standard review to separate science from fear-mongering.

If you're into evidence-based nutrition, skeptical of viral health scares, or just want to know if your Diet Coke habit is secretly wrecking your metabolism — this episode has the receipts.

Subscribe for more deep-dive breakdowns of the latest research, and drop a comment: Do you use aspartame? Has this changed your view?

SPONSORS

• Outwork Nutrition - Evidence-Based Supplements to Support Your Hard Work: https://outworknutrition.com

• David Protein - Buy 4 cartons, get 1 FREE at: https://davidprotein.com/pages/layne

LAYNE'S COMPANIES

Carbon Diet Coach: https://joincarbon.com/podcast

Outwork Nutrition: https://outworknutrition.com

REPS Research Review: https://biolayne.com/reps

Workout Builder: https://biolayne.com/workout-builder

Team Biolayne: https://biolayne.com/online-coaching

Physique Coaching Academy: https://physiquecoachingacademy.com

FOLLOW LAYNE

https://www.facebook.com/laynenorton

https://www.twitter.com/biolayne

https://www.instagram.com/biolayne

TIMESTAMPS

0:00:00 - Intro

0:02:53 - What is Aspartame

0:05:15 - Health Claims

0:11:26 - How Aspartame is Metabolized

0:14:15 - HRCTs

0:15:56 - Outwork Nutrition

0:18:06 - Study Overview

0:19:25 - Inclusion Criteria

0:31:43 - Results

0:40:38 - David Protein

0:42:13 - Results Cont.

0:49:51 - Discussion

0:58:53 - Conclusion

SHOW NOTES

https://biolayne.com/podcasts/dr-layne-norton-podcast/study-deep-dive-does-aspartame-increase-insulin-episode-20