Last year, the National Heart, Lung and Blood Institute (NHLBI) redefined overweight and obese, based on body mass index, or BMI. (Using the old definitions, one in three Americans was overweight or obese. Now its one in two.)
The numbers apply to both men and women, but theyre not foolproof. Some very muscular people may have a high BMI without health risks. And a waist thats larger than 40 inches in men or 35 inches in women means an increased risk of heart disease, diabetes, and other health problems, no matter what your BMI.
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