Multiple clinical studies and reviews demonstrate that the human body can undergo body recomposition, successfully building muscle mass while simultaneously losing body fat through appropriate resistance training and nutritional strategies.
The retrieved literature consistently supports the claim that the human body can build muscle while losing body fat (body recomposition). Multiple studies (e.g., papers 0, 1, 2, 7, and 10) document concurrent improvements in lean mass/muscle size and reductions in body fat or fat mass when subjects undergo resistance training, specific therapies, or energy restriction paired with adequate protein intake. There is no evidence refuting this capability.