Doctors and health officials have relied for decades on body mass index (BMI), a ratio of height to weight, to categorize people as overweight and obese.
A new study, however, suggests the use of BMI may be leading us to underestimate the already sky-high obesity rate.
BMI, the researchers say, is an overly simplistic measure that often misrepresents physical fitness and overall health, especially among older women. Nearly 4 in 10 adults whose BMI places them in the overweight category would be considered obese if their body fat percentage were taken into account, according to the study.
"Some people call it the 'baloney mass index,'" says lead author Eric Braverman, M.D., president of the Path Foundation, a nonprofit organization in New York City dedicated to brain research.
Bodybuilders can be classified as obese based on their BMI, he says, while "a 55-year-old woman who looks great in a dress could have very little muscle and mostly body fat, and a whole lot of health risks because of that -- but still have a normal BMI."
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