I've been on quite a few college campuses. Generally with state schools the closer the school is to being a "flagship" the less Obeasts in the student population. Winning athletics and numerous Greek organizations (whether you have an interest in them or not) correlate with a solid base of human sized students which provide social pressure and an example for the rest of the student population. Losing athletics and a weak greek community seem to correspond to a poor campus fitness culture. With private schools though, I have yet to discern any clear trends.