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The modern definition of obesity is based on body mass index (BMI) as presented in the Practical Guide to the Identification, Evaluation and Treatment of Overweight and Obesity in Adults, a joint publication of the National Institutes of Health National Heart, Lung, and Blood Institute, and the North American Association for the Study of Obesity. Body mass index compares body weight (in kilograms) to height (in meters) (BMI = weight/height²). "Normal" values are less than 24.9 kg/m², and "overweight" individuals have a BMI between 25 and 29.9 kg/m². "Obese" patients are placed in three classes: Class 1 = BMI 30 to 34.9 kg/m², Class 2 = BMI 35 to 39.9 kg/m², the "Morbidly Obese" Class 3 = BMI 40 to 49.9, and "Super Obese" BMI > 49.9 kg/m².— DukeHealth.org
posted by jessamyn at 4:06 AM on September 25, 2006