阅读理解. When one person gains weight , their clo friends oftenfollow

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  When one person gains weight , their clo friends oftenfollow. Rearchers have just offered evidence in a study that says obesity (肥胖) appears to spread through social ties. But the findings might also offer hope.  If friends help make obesity acceptable , then they might also be influential in losing the fat.The rearchers note that support groups are already an effective tool in dealing with other socially influenced problems , likealcoholism (酗酒 ) . The findings appeared in the New EngLand Journal of Medicine. The rearchers ud information collected from 12, 000 people. It was collected between 1972 and 2003 as part of the Framingham Heart Study. The information was highly detailed. There was even contact information(联络信息 ) for clo friends of the people in the study. The rearchers examined more than 40 , 000 social ties. They found a person's chances of becoming verely overweight incread by 50% if a friend had become obe. A sister or brother of a person who became obe had a 40% incread chance of becoming obe. The risk for a wife or husband was a little less than that. Nicholas Christakis of Harvard Medical School was a lead rearcher in the study. He says there is a direct causal relationship (因果关系) betweena persongetting fatandbeing followed in weight gain by a friend. The study found that the x of the friends was also an influence. In same-x friendship, a person had a 71%incread risk of becoming obe. Men had a 44%incread risk of becoming obe after weight gainin a brother. In sisters ,it was 67% . The rearchers also considered the effect of where people lived in relation to each other. James Fowler of the University of California,was the other lead expert. He says a friend who lives a few hundred kilometers away has as much influence as one in the same neighhorhood. He says the study demonstrates the need to consider that a major part of people's health is tied to their social connections. Both rearchers say their rearch shows that obesity is not just a private medical issue , but a public health problem.

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