Men Love Lifting Ladies!

“Really, an “obesity bug”? In 2007, Harvard researcher Nicholas Christakis and his colleagues analyzed 32 years’ worth of data from an interconnected social network of 12,000 adults and found that a person’s chances of becoming obese increased 37% if a spouse had become obese, 40% if a sibling had and 57% if a friend had.

Socializing with overweight people can change what we perceive as the norm; it raises our tolerance for obesity both in others and in ourselves. It’s also about letting your hair down. Past research has shown that adults tend to eat more around friends and family than they do with strangers. They shed their inhibitions about how it looks when they go back for thirds or order the alfredo sauce instead of the marinara.

Finally, there’s the idea that we like to hang with people who are like ourselves. Cornell food sociologist Jeffrey Sobal explains that “especially among two overweight people, there’s a sort of permission-giving going on. We’re encouraging each other to eat more.”

Salvy, who is an assistant professor of pediatrics at the State University of New York at Buffalo, refers to this phenomenon as a sort of feedback effect. Conversely, she suggests, overweight diners are more likely to tone down how much they eat in front of skinny people to avoid the stigma of overeating.

When it comes to holding back, though, there’s nothing like the opposite sex to curb our appetites, at least when we’re single. In a study to be published in the October issue of Appetite, researchers at Montreal’s McGill University secretly observed 460 college students eating in the campus cafeterias. They found that when a woman was with a man, she ate about 100 calories less than when she was with a woman. The more men present in larger eating groups, the fewer calories a woman had on her tray. Women ate roughly 100 fewer calories for each man at the table. But there was no such effect on men. And women who only ate with other women tended to slightly increase their calorie quotient.”