people are fat for the same reasons that people feel that they need to be jerks to people... because everyone is different... some lack discipline, some have the genetic predisposition for it, etc and so on. Why would you feel uncomfortable talking to anyone unless maybe they were holding an axe and looking at you funny... but seriously never make fun of fat people just because they are not in the shape you are. i'm pretty fat right now myself but I am changing that and one of my friends who happens to be a martial artist could still kick over his head when he was 370 so eventually you'll be put in your place if you act like a jerk becuse you just never know what that person you are making fun of is capable of... yeah i took a little offense to this and i know i have more issues than time magazine but still... how hard is it to just be nice to people.
Rich