I’ve posted earlier on the issue of social obesity (i.e., your friends can make you fat) here, here and here.
Economist Gary Becker and Judge Richard Posner have a point-counterpoint blog that focuses on various issues, but most recently raises a few additional issues relating to the Christakis et al Framingham study.
They agree that few of us know our objective obesity (which is defined in body mass index of weight relative to height) and that people who are overweight tend to believe that they are more normal weight than they are. It thus makes sense that ones friends (if they are similar in obesity or thin-ness) help one to shape one’s self-conception of the average weight of society.
Becker points out that the ideal study would look at college freshman randomly assigned roommates and seeing whether those assigned to larger roommates were more likely to put on pounds…
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Utopia, you are standing in it! 
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