This article suggests that obesity could be contagious. Apparently its all down to how fat you feel compared to other people around you. Two leading economists have said that in a society where there are a growing number of overweight people, you are less bothered about staying slim. It seems that as obesity becomes more common the perception of what is counted as obese changes or as the article puts it "When my neighbour gets a little fatter, I ...become a little fatter since it is now not necessary to be so slim in order to compete." Judging by this if we want to be thin, we should make sure we have thin neighbours.