The number of young children who are obese and extremely obese is going down, according to new data released by the Centers for Disease Control and Prevention.

In what researchers say is the first national study to show that the prevalence of obesity among young children may have begun to decline, scientists analyzed data from more than 27 million children from low-income families between the ages of 2 and 4 in 30 states and the District of Columbia.

"The results of this study indicate modest recent progress of obesity prevention among young children," according to the study published Tuesday in the Journal of the American Medical Association (JAMA). 

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