Lose Fat, Not Muscle: How to optimize fat loss and preserve lean mass on GLP-1 medications

Most people on GLP-1 medications celebrate the number dropping on the scale. Almost no one warns them what that number hides: up to 40% of what you lose can be muscle, not fat.

That lost muscle is why so many people regain weight after stopping, feel weaker at a lower body weight, and watch their metabolism slow instead of recover. The medication works. The plan around it usually doesn't.

Lose Fat, Not Muscle fills the gap your prescription came without.

Nelson Vergel, founder of ExcelMale.com and author of Testosterone: A Man's Guide and other books, brings four decades of work in metabolic health, hormone optimization, and muscle preservation to one of the most urgent questions in medicine today: how do you get the fat-loss benefit of a GLP-1 while keeping the lean mass that keeps you strong, metabolically healthy, and able to hold your results?

This is not a diet book, and it is not a promotion for any drug. It's a practical system built on clinical evidence and real community experience, written for men and women who want to do this right.

Inside, you'll learn how to:

• Track what actually matters — fat loss versus muscle loss, not just the number on the scale
• Hit the protein targets that protect lean mass during a calorie deficit
• Train to preserve, and even build, muscle while losing fat
• Understand GLP-1s and testosterone in men — and when TRT belongs in the picture
• Navigate menopause metabolism, HRT, and GLP-1 synergy for women
• Catch a thyroid that's quietly sabotaging your results
• Titrate, maintain, and come off medication without losing your progress
• Work with your provider using the right labs, tests, and questions

You'll also get eight complete case examples, showing how the same principles adapt to eight different people with different goals, ages, and starting points.

Every recommendation is grounded in the published literature — more than 60 primary references, including the New England Journal of Medicine landmark GLP-1 trials, endocrinology and body-composition research, and decades of clinical practice. Community insights from ExcelMale.com discussions show how these principles play out in real life, anonymized and paraphrased.

What sets this book apart:



• Body composition, not body weight. The entire framework is built around preserving lean mass — the metric that determines whether your results last.
• Men and women, separately and honestly. Hormonal realities differ, and this book treats them that way, with dedicated sections for male and female physiology.
• Evidence-tiered, not hype-driven. Supplements, peptides, and protocols are ranked by strength of evidence, so you know what's proven, what's promising, and what's noise.
• Written to be used. Quick-reference appendices cover protein sources, home and gym training programs, supplement guidance, lab ranges, and how to get an accurate DEXA scan.

Whether you're about to start a GLP-1, already on one and worried about muscle loss, or planning your exit strategy, this book gives you the complete plan your prescription didn't include.

Keep the fat loss. Keep the muscle. Keep the results.