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

• 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

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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