Hey chin up! I'm in the same boat but I reply "funny when I was fat you didn't tell me to stop eating but it's alright to comment now I'm thin" and " I like the anorexic look, I've tried obesity now in doing anorexia" .. People are generally taken aback with a reply like this so I recommend it!! The fact is being fat is more damaging to your health but people don't see it like that. Just carry on as usual, it's a bad time for you so just get through it...eat what you can and don't get hung up on it.. I treat it as a daily adventure now! X