Hao G, et al. - The associations between diet, physical activity (moderate + vigorous), and skeletal muscle mass in adolescents were determined by researchers. In 640 adolescents, they evaluated diet with four to seven 24-hour recalls and physical activity through accelerometry. Skeletal muscle mass index (SMMI) was negatively associated with sugar-sweetened beverage and saturated fat consumption. The adolescence study suggests that skeletal muscle mass is associated with physical activity and consumption of both sugar-sweetened beverages and saturated fats. More importantly, the findings suggest that intake of sugar-sweetened beverages can mitigate the beneficial effects of physical activity on the muscle mass of the skeleton.