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It’s no surprise, then, that obesity rates among U.S. youngsters have skyrocketed, tripling from 1976 to 2004. Public-health experts and obesity researchers attribute the trend in part to kids’ increasingly sedentary lifestyles. As teens spend more and more time anchored before a screen — burning fewer and fewer calories each day — they’re storing more of that unused energy as fat. Hence, the ballooning rates of obesity.(See TIME’s video “Obesity and Social Networks.”)

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