if you hang out with obese people, then your subconscious mind will think it's okay to eat a lot of food.. thus making you obese (after enough eating)
I disagree, being around fat people does not make you "Think its okay" to eat a lot of food.
Previous poster, Can you catch gay by being around homosexual people? I think not, and if you can, your field of vision is a little narrow.
OP, you can't "catch" obesity, thats plain stupid, eating lots is a decision, but not really something you can be peer pressured into.