Being obese can take years off your life and in some cases may be as dangerous as smoking, a new study says.
British researchers at the University of Oxford analyzed 57 studies mostly in Europe and North America, following nearly one million people for an average of 10 to 15 years. During that time, about 100,000 of those people died.
The studies used Body Mass Index (BMI), a measurement that divides a person’s weight in kilograms by their height squared in meters to determine obesity. Researchers found that death rates were lowest in people who had a BMI of 23 to 24, on the high side of the normal range.
Health officials generally define overweight people as those with a BMI from 25 to 29, and obese people as those with a BMI above 30.
The study was published online Wednesday in the medical journal, Lancet. It was paid for by Britain’s Medical Research Council, the British Heart Foundation, Cancer Research UK and others.
“If you are heading towards obesity, it may be a good idea to lose weight,” said Sir Richard Peto, the study’s main statistician and a professor at Oxford University.
He said that obese people were also two thirds more likely to die of a heart attack or stroke, and up to four times more likely to die of diabetes, kidney or liver problems. They were one sixth more likely to die of cancer.Previous studies have found that death rates increase both above and below a normal BMI score, and that people who are moderately overweight live longer than underweight or normal-weight people.