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Experts cannot point to any one factor driving the improvement in childhood obesity but said greater awareness about exercise and healthy eating in schools in likely one of the reasons. (Cronkite News Service photo by Tiffany Martin)

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Study: Childhood obesity in Arizona levels off as national rate falls

The obesity rate for low-income Arizona preschoolers remained level from 2008 to 2011 after growing sharply in previous years, according to a new Centers for Disease Control and Prevention study.