No you're not big boned, and it's got nothing to do with that Big Mac a day you have along with full-fat coke. Being fat is not your fault, it's your fat friends fault. Their fatty disease has spread to you, it's official. At least that's what a report in the New England Journal of Medicine says.
According to the International Herald Tribune, it involved a "detailed analysis of a large social network of 12,067 people who had been closely followed for 32 years, from 1971 until 2003." The investigation's lead Dr. Nicholas Christakis, professor of medical sociology (wtf??) at Harvard Medical School essentially claims that if you start hanging around with fat people you find the body acceptable. Your peers therefore act as "a kind of social contagion, that spreads through the network."
Personally it sounds like bollocks to me, but then I am a cynic. Let's put it like this, if you flip it on its head then it's probably not wise to have special centres for anorexics to hang around together right? In fact, if the research was correct, then the success rate of those sort of places would be lower than it is wouldn't it?