I just want to point out my personal experience on this subject. When I was a teenager I was a bulimic, so my shrink put me on anti-psychotics that made me gain a HUGE amount of weight as in 80 pounds in 6 months. I'm still on anti-psychotics, which not only make you gain weight, but make it seriously hard to lose it also, as in nearly impossible. It's really frustrating when you eat healthy and you try to work out, and still you're looked at as a fat slob because the weight just doesn't come off because of your medication.