Abstract
The aim of this study was to determine the effect of the carbohydrate/fat ratio on body composition, body weight, muscle mass and nitrogen retention in young bodybuilders. This was a prospective, randomized cross-over study with eleven voluntary males undergoing bodybuilding training. The volunteers were randomly divided in two groups; one receiving a dietary carbohydrate/fat ratio of 4.0 (D1) and the other one receiving a dietary carbohydrate/fat ratio of 8.0 (D2); both groups receiving a high-protein diet (1.5 g protein/kg/d). Muscle mass, fat mass, nitrogen retention and biochemical analyses were assessed. Both diets promoted weight and fat mass gain and positive nitrogen retention. However, D2 showed a higher muscle mass gain. Thus, the higher carbohydrate/fat ratio resulted in a greater muscle mass gain.