Americans are much less physically active, on average, than they were in the past. Major culprits include the increasingly sedentary nature of many forms of work; dramatically increased time spent sitting in cars, watching TV, and using computers; and lack of daily physical activity in most schools. Last year an analysis of U.S. data in the American Journal of Medicine concluded that the number of women who reported no leisure-time physical activity jumped from 19 to 52 percent in the past two decades; in men the numbers rose from 11 to 43 percent. Burning fewer calories means storing more of them as body fat. And, in turn, obesity and its consequences discourage many people from exercising and staying active. Still, for most obese people, physical activity by itself, without reduction in calorie intake and improvement in diet, won’t lead to significant and long-term weight loss.
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