If the news last month that the prevalence of obesity among American preschoolers had plunged 43 percent in a decade sounded too good to be true, that's because it probably was, researchers say.
When the study was published in late February in the Journal of the American Medical Association, no one had a ready explanation for that astounding finding by researchers at the U.S. Centers for Disease Control and Prevention. Indeed, it seemed to catch the experts by surprise.
Anti-obesity campaigners credited everything from changes to the federal nutrition program for low-income women and children to the elimination of trans-fats from fast food, more physical activity in child-care programs and declining consumption of sugary drinks.
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