Vigorous Play Keeps the Pounds Off

Are fat people fat because they don't exercise enough? Or do they not exercise enough because they are fat? These questions are actually tougher to answer than you might suppose, as a study from the U.K. in the open-access journal PLoS: Medicine makes clear.Investigators found that moderate to vigorous physical activity in a group of 5,500 12-year olds was associated with a lower risk of obesity.