Can You Build Muscle While Losing Fat? The Science of Body Recomposition

Vanessa breaks down the biggest takeaways from her conversation with Dr. Sara Oikawa, including what the research says about losing body fat while preserving—or even gaining—lean mass.

A major focus is a tightly controlled body recomposition study in which young men followed a 40% calorie deficit while completing intensive resistance and interval training.

The group consuming 2.4 g/kg of protein per day actually gained lean mass while losing fat, while the lower-protein group maintained lean mass.

Vanessa explains why resistance training was likely the most important signal, how higher protein intake may support muscle preservation during a deficit, and why body recomposition depends on much more than calories alone.

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Vanessa also recaps Dr. Oikawa's step-reduction research, where older adults reduced their activity to just 750 steps per day.

Even while consuming a high-protein diet, participants still lost lean mass—highlighting why protein cannot completely replace the stimulus of muscle contraction.

Another major focus is protein quality.

Vanessa breaks down research comparing whey protein isolate and collagen peptides, why they do not produce the same muscle protein synthetic response, and why simply counting total grams of "protein" may not tell you whether you are getting enough essential amino acids to support muscle.