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If your friends and family get fat, chances are you will too, researchers report in a startling new study that suggests obesity is "socially contagious" and can spread easily from person to person.
The large U.S.-funded study found that to be true even if your loved ones live far away. Social ties seem to play a surprisingly strong role, even more than genes are known to do.
"We were stunned to find that friends who are hundreds of miles away have just as much impact on a person's weight status as friends who are right next door," said coauthor James Fowler of the University of California, San Diego.
The study found a person's chances of becoming obese went up 57% if a friend did, 40% if a sibling did, and 37% if a spouse did. In the closest friendships, the risk almost tripled.
On average, the researchers calculated, when an obese person gained 17 pounds, the corresponding friend put on an extra five pounds.
Gender also had a strong influence. In same-sex friendships a person's obesity risk increased by 71% if a friend gained weight. Between brothers, the risk was up by 44% and 67% between sisters. Obviously, the impact within a same-sex relationship would be of similar proportions.
Researchers think it is more than just people with similar eating and exercise habits hanging out together. Instead, it may be that having relatives and friends who become obese changes one's idea of what is an acceptable weight.
Despite their findings, the researchers said people should not sever their relationships.
"There is a ton of research that suggests that having more friends makes you healthier," Fowler said. "So the last thing that you want to do is get rid of any of your friends."
The study was published in Thursday's New England Journal of Medicine and funded by the National Institute on Aging.
Researchers analyzed medical records of people in the Framingham Heart Study, which has been following the health of residents of that Boston suburb for more than a half century. They tracked records for relatives and friends by using contact information that participants provided each time they were examined over a 32-year period.
In all, 12,067 people were involved in the study.
After taking into account natural weight gain and other factors, researchers found the greatest influence occurred among friends and not among people sharing the same genes or living in the same household. Geography and smoking cessation had no effect on obesity risk.
Indiana University statistician Stan Wasserman said that while the study was clever, it had its limitations because it excluded relationships outside of the Framingham group.
Obesity is a global public-health problem. About 1.5 billion adults worldwide are overweight, including more than 400 million who are obese. Two thirds of Americans are either overweight or obese.
Much of the recent research focus has been on the intense hunt for obesity genes involved in appetite or calorie burning.
The findings could open a new avenue for treating this worldwide epidemic. The researchers said it might be helpful to treat obese people in groups instead of just the individual.
"Because people are interconnected, their health is interconnected," said lead author Nicholas Christakis, a Harvard sociologist. (Alicia Chang, AP)
Study: Obesity is
"socially contagious"
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