Researchers reviewing nearly 100 studies found further evidence of the "obesity paradox" -- the notion that being somewhat overweight is associated with better health. People who were overweight or slightly obese showed a 6% lower mortality risk than normal-weight patients, according to the study. However, severe obesity was associated with a 29% higher mortality risk, and researchers said the paradox could be a statistical anomaly or an indication that body mass index is a flawed metric.

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