Trying to lose weight?? Read this!

Friendship offers support, laughter - what about the occasional spare tire?

A study in this week's New England Journal of Medicine finds that social networks have an even greater effect on chances of becoming obese than genes do. The findings may help explain why obesity is rising in America despite widespread dieting and other weight-loss techniques, and why people's best efforts to slim down on their own are so often short-lived. They also suggest that public health initiatives to fight obesity should take social networks into account, and work with overweight people in groups, as organizations such as Weight Watchers International Inc. have done for years.

A person's chance of becoming obese jumped 57% if he or she also had a friend who became obese during a given time. If one adult sibling became obese, the chance that the other would follow suit increased by 40%. These findings were particularly true if siblings and friends were of the same sex -- since, researchers say, people are more influenced by those they resemble than those they do not. Indeed, the chance of becoming obese rose 71% if it was a same-sex friend who gained the weight.

The study is part of a larger trend in science and social science to examine the effect of networks, from the role that interconnected neurons play in cognition, to even networks of terrorism. There's evidence, for instance, that political attitudes are shaped by social circles, and that when it comes to sexual behavior, teens are more influenced by their immediate friends than by the most popular group at school or by the media.

"Networks are really important for the transmission of ideas and values," says Katherine Stovel, a University of Washington sociology professor who studies networks. "People come to resemble one another." But, she cautioned, "I don't want anybody to read this and think about dropping friends because they're fat."

This is a good comment on this study I read on the web.