ADF vs OMAD - Which Fasting protects MUSCLE better?

Alternate-day fasting (ADF) vs one meal a day (OMAD): which fasting method is better for preserving muscle while losing fat?

In this evidence-based comparison, we examine human studies on muscle retention, lean body mass, muscle protein synthesis, protein intake, and strength performance. Across seven rounds, we compare what the research shows—and where the evidence remains limited.

The key distinction: ADF earns the higher score in this comparison because it has a stronger evidence base. That does not establish that ADF preserves more muscle than OMAD in a direct comparison. The ADF muscle protein synthesis study discussed here included protein on restricted-calorie days, so its findings should not be extended to strict zero-protein fasting.

In this video, you’ll learn:

• What ADF and OMAD studies report about lean mass during weight loss
• Why protein distribution and total protein intake both matter
• How strict fasting days differ from modified ADF
• What the evidence says about strength and training performance
• Why resistance training, adequate protein, and a manageable calorie deficit remain central to muscle protection

The seven-category scorecard is my interpretation of the evidence and practical trade-offs—not a validated scientific rating.

I’m Denis, a German engineer, licensed fitness coach, and creator of Workout Engineer. I compare fitness and health methods, explain the research, and help you decide what fits your goals.

Fitness and health—engineered with data.