Diet vs exercise for the prevention of pediatric obesity: the role of exercise.

As pediatric obesity is commonly viewed as the result of an excessively positive energy balance, preventive efforts typically emphasize reduction of energy intake, with increases in physical activity (PA) having a supporting role. However, recent research that has focused on body composition rather than weight has found that PA stimulates development of lean tissue rather than fat tissue. Preventive interventions that emphasize vigorous PA rather than restriction of energy intake can help youths to develop lean bodies, at the same time that they ingest sufficient amounts of the energy and accompanying nutrients needed for healthy growth.