A new study from Australia finds that people aged 65 and over with a body mass index in the overweight range live longer and suggests perhaps the World Health Organization guidelines on BMI may not be suitable for older people.The World Health Organization (WHO) defines overweight as having a body mass index (BMI) greater than or equal to 25, and a BMI of 30 or over as obese. BMI is equal to a person's weight in kilos divided by the square of their height in meters (kg/m2).
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