Just recently he's stopped eating anything more than maybe a single snack a day. He's convinced he's fat, which he isn't. He doesn't think it's a problem, I've been trying to persuade him otherwise for days now and getting nowhere, and I think it's starting to put a strain on our friendship.

I'm worried to hell about him and it doesn't seem like there's anything I can do; if he won't admit it's a problem he's never going to do anything about it. So... well, what can I do?