As obesity rates in children have been rising, we’ve heard how lack of exercise and a bad diet are to blame. Now, a surprising new study from Johns Hopkins Bloomberg School of Public Health says the amount of physical activity among U.S. teens has not changed that much over the past 20 years, but teens have still gotten heavier. So, is diet the only reason for the weight gain? Or will we see another study in the future with different results about how much teens are exercising?

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