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Body Mass Index and Mortality in a Very Large Cohort: Is It Really Healthier to Be Overweight?

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Context: Controversy persists about optimal body weight. Many experts define "normal" (healthy) body mass index (BMI) as 18.5 to 24.9 kg/m2, 25 to 29.9 kg/m2 as overweight, and 30 kg/m2 or greater as obese. Obesity is subdivided ... ...