There's a roughly 20 percent chance you are 'skinny fat' or 'healthy obese'


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Body mass index (BMI) doesn't tell the whole story about your weight and health, says Albert Sun at The New York Times. The formula commonly used to determine obesity (or underweight) is so popular because it's easy to measure height and weight. But in 18 percent of cases, according to data from the Center for Disease Control and Prevention's National Health and Nutrition Examination Survey, BMI gets it wrong.
In 11 percent of cases, people labeled overweight have healthy amounts of fat, and 31 percent of those underweight or normal weight have excess fat. More men are "healthy obese" than "skinny fat," while the reverse is true for women. Here's what the women's weight/fat data look like mapped out:
The CDC measured body fat percentage with a type of X-ray called a DXA scan, Sun explains, and the discrepancy between that more expensive measurement and BMI matters: "The consequence is that some perfectly healthy high-BMI people might be unnecessarily worried about their weight or penalized by higher insurance premiums. And some normal-BMI people may be fatter than they realize and facing the same health risks as the obese." You can learn more, and see the men's weight/fat spread graphed out, at The New York Times.
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Peter Weber is a senior editor at TheWeek.com, and has handled the editorial night shift since the website launched in 2008. A graduate of Northwestern University, Peter has worked at Facts on File and The New York Times Magazine. He speaks Spanish and Italian and plays bass and rhythm cello in an Austin rock band. Follow him on Twitter.
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