Why Fat Loss Stalls Despite High Protein: Protein That Actually Counts - Dr. Paul Moughan Recap

Optimal Protein Podcast with Vanessa Spina

Vanessa Spina

Health & Fitness, Nutrition, Fitness

4.6 • 795 Ratings

🗓️ 13 February 2026

⏱️ 42 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Start of episode recap is at 13.41

In today's Friday solocast, Vanessa Spina breaks down the biggest takeaways from her interview with Dr. Paul Moughan—one of the world's leading experts on protein quality, amino acid digestibility, and how much of the protein you eat actually becomes usable by the body.

If you've ever wondered why fat loss stalls in a deficit, why muscle can drop even when you "hit your protein," or why metabolic rate seems to slow during dieting—this episode explores a rarely discussed variable: utilizable protein and amino acid delivery to tissues.

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What you'll learn in this episode:

Why protein grams on labels don't equal protein your body can use
The difference between total protein vs. utilizable protein (what actually reaches tissues)
How DIAAS (Digestible Indispensable Amino Acid Score) upgrades outdated protein scoring systems
Why fat loss diets can unintentionally accelerate lean mass loss if protein quality is low
How the body prioritizes amino acids (and why muscle can become the "last resort")
The overlooked role of the gut's massive protein turnover and amino acid demand
Why low protein quality can contribute to metabolic adaptation (lower RMR over time)
Why women in perimenopause/menopause, dieters, vegans, and older adults may be more vulnerable
The collagen "protein" mistake: why collagen is not a primary protein source for preserving muscle
Practical strategies to improve outcomes without simply "eating more protein"
The future of protein labeling: why "digestible protein" may eventually replace total protein on labels

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🎙 The content in this podcast is for informational purposes only and not nutritional or medical advice. Always consult your healthcare provider before making major dietary or lifestyle changes.

Transcript

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0:00.0	Welcome to the optimal protein podcast. I'm Vanessa Spina. Hello, my friends. Welcome back to the optimal
0:07.8	protein podcast. I'm your host Vanessa. And today's episode is a deep dive into one of the most
0:14.0	important recaps that I have ever done. Today's episode changes how we think about protein, not how much protein, but how much of that
0:25.0	protein actually counts. Now, we are in the middle of a protein renaissance. Protein is trending.
0:34.3	Protein recommendations are actually increasing. People are prioritizing muscle.
0:40.8	But here's the problem. We are still measuring protein in a way that ignores what the body
0:47.1	actually uses. Now, in my groundbreaking recent interview with Dr. Paul Mugan, one of the world's
0:53.9	leading authorities on
0:55.3	protein quality and amino acid digestibility, we explored something that almost no one talks about.
1:03.6	Two people can eat the same grams of protein, but absorb very different amounts of essential
1:10.4	amino acids and experience completely different
1:15.1	fat loss and muscle retention outcomes. So on today's episode, I'm breaking down why fat loss can
1:22.4	stall even in a deficit, why muscle loss can happen despite hitting your protein target, why metabolic rate
1:31.0	may slow for reasons beyond calories, and why women, dieters, vegans, and mature adults are
1:38.8	especially vulnerable. And how to fix it, because the truth is, protein grams are not the same as usable amino acids
1:48.5	and if you care about body composition fat loss muscle gain and retention and longevity
1:56.7	this all matters so i can't wait to get into today's episode. We are going to be recapping
2:03.8	the interview with Dr. Paul Mugan, bringing you all the top key information and actionable
2:10.4	takeaways that you can apply to your life today to see results. So I can't wait to break it
2:15.3	all down with you on today's episode. And we're going to jump
2:18.7	right in after this quick break. Friends, if you've been curious about red light therapy or
2:24.9	you've seen me or other people using red light therapy panels, I want to take a moment to share
	...

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