How Obesity Changes Muscle Metabolism—and How to Protect Muscle During Fat Loss with Dr. Paul Morgan — Optimal Protein Podcast with Vanessa Spina

What happens inside skeletal muscle during obesity—and how can we protect lean mass while losing fat?

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In this episode, Vanessa speaks with Dr. Paul Morgan about the hidden effects of obesity on muscle metabolism, including anabolic resistance, fat infiltration, inflammation, and changes in muscle protein turnover.

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They explore the paradox that carrying more body mass can increase the loading stimulus on muscle, while obesity may simultaneously reduce the muscle-building response to protein and exercise.

Dr. Morgan also explains why preserving lean mass is so important during weight loss, including during aggressive calorie restriction and GLP-1 use, and how resistance training, adequate protein, and regular activity can help improve the quality of weight loss.

They also discuss protein needs with aging, per-meal protein targets, mTOR, autophagy, and why animal research should not always be translated directly into human nutrition advice.

In this episode, you'll learn

What anabolic resistance is and why it matters
How obesity may affect muscle protein synthesis and breakdown
Why fat infiltration and inflammation can reduce muscle quality
How to better preserve muscle during fat loss
How GLP-1 use may affect lean mass
Why protein needs may increase with age and calorie restriction
The difference between temporary and chronic mTOR activation
Why animal findings do not always translate directly to humans

Dr. Paul Morgan is a Research Fellow in the School of Sport, Exercise and Rehabilitation Sciences at the University of Birmingham, UK. His research focuses on skeletal muscle metabolism, obesity, aging, anabolic resistance, and the effects of nutrition and exercise on muscle health and function.

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The content provided in this podcast is for informational purposes only and should not be construed as medical advice. Consult with a healthcare professional before making significant changes to your diet or exercise regimen.