He could achieve better results training properly and more safe, it's mental issue.. I've been bigger and smaller, depending on circumstances, up to a level of head turning monster, down to a very lean athletic look when people would comment how "skinny" I've became (yeah, right) clothes on, and I couldnt care less, as long as I can go to the gym to perform my routine, bigger or smaller (and I love being bigger, no need to lie here), but feeling fit and healthy, is it so difficult? Probably... when all you have is your muscles to show off
Speaking of "friends", don't overestimate that word. Many times friends are silently waiting for a downfall just to feel at least a little bit better about themselves, that's fucked up, but if you think that most people are able to rise above primitive instincts like that, you are most probably wrong..