I live in a medium-sized city that hosts a couple of medium-sized anime conventions...  sometimes I blunder into them by accident (I live quite close to the convention center) and walk through the people there, just to look at them.  Usually it seems to be a fairly even mixture of thin, out-of-shape, awkward-looking types, and fat, awkward-looking types, with a few genuinely sexy girls and muscly guys speckled about.  Lots of people aren't fat, which is nice, but lots of people are, which sucks. Thin or fat, though, they do generally look like people who haven't been educated much on nutrition or exercise, which matches well with my memories of being a young science fiction fan who (of course, like anybody) wanted to be healthy but only had ignorant parents, abysmally lame gym classes, and the occasional very brief Home Ec. course to support me in that regard.  Oh man are schools ever pathetic at teaching kids (even nerdy A+ students or aspiring athletes who would actually pay attention) how to take care of their bodies.   At least here in the US anyway.