Sending your kids back to lunch-lady land this fall? Careful, your child's dining mates may be upping his chances of packing on the pounds. A study published in the August issue of the American Journal of Clinical Nutrition finds that how much tweens and teens eat can be influenced by how much their friends weigh.
In the study, 130 kids ages 9 to 15 were allowed to snack as much as they wanted while hanging out with a friend or with a peer they did not know. All the kids ate more when they were with a friend than with a stranger. But the overweight children ate the most when paired with an overweight friend - an average of 300 more calories than when they spent time with leaner friends. The research also found that friendship itself makes the appetite grow stronger: when overweight kids ate with similar-weight kids who were already their pals, they threw back an extra 250 calories than they did with chubby kids they had just met.
Finally, there's the idea that we just like to hang with people that 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. link..
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