Mortality risks of being overweight or obese are underestimated

Many obesity studies substantially underestimate the mortality risks associated with excess weight in the United States, new research indicates. Normal weight is indicated by a BMI of 18.5-24.9 kg/m2, overweight is indicated by a BMI of 25.0-29.9 kg/m2, obese class 1 is a BMI of 30.0-34.9 kg/m2 and obese class 2 is a BMI of 35.0 kg/m2 and above. Skeptics of the meta-analysis argue that the findings are likely driven by biases, especially by illness-induced weight loss.

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