Although a third of kids are overweight or obese, studies have shown that up to 90 percent of parents think their children are just fine. In a 2007 Michigan study, 8 percent of parents of obese children thought their kids were actually underweight.

SOURCES: National Health and Nutrition Examination Survey, CDC, University of South Florida, University of Michigan | Bonnie Berkowitz and Laura Stanton/The Washington Post March 21, 2011
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