The New England journal of medicine
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Obesity, defined by a body-mass index (BMI) (the weight in kilograms divided by the square of the height in meters) of 30.0 or more, is associated with an increased risk of death, but the relation between overweight (a BMI of 25.0 to 29.9) and the risk of death has been questioned. ⋯ Excess body weight during midlife, including overweight, is associated with an increased risk of death.
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Obesity is associated with diverse health risks, but the role of body weight as a risk factor for death remains controversial. ⋯ Underweight, overweight, and obese men and women had higher rates of death than men and women of normal weight. The association of BMI with death varied according to the cause of death and was modified by age, sex, and smoking history.