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

LAYNE'S COMPANIES
Carbon Diet Coach: joincarbon.com/podcast
Outwork Nutrition: outworknutrition.com
REPS Research Review: biolayne.com/reps
Workout Builder: biolayne.com/workout-builder
Team Biolayne: biolayne.com/online-coaching
Physique Coaching Academy: physiquecoachingacademy.com

FOLLOW LAYNE
facebook.com/laynenorton
twitter.com/biolayne
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
biolayne.com/podcasts/dr-layne-norton-podcast/…