People who are slightly overweight but not obese—as defined by their body mass index (BMI)— tend to live longer than their normal-weight counterparts, according to a new Danish study. But that has not always been the case. In the 1970s, the Danish data show, study subjects with the best chance of living longer tended to have a BMI in the normal range, defined as being between 18.5 and 25. Someone who is 1.65 meters (five feet, four inches) tall and weighs 68 kilograms (150 pounds) would have a BMI of 25.
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