Under 600 calories a day?! Honey, my LUNCH has more than that! Some people just don't have it in them to be stick thin... starving yourself IS NOT a good thing to do. From what I understand, you are never supposed to drop below 1,200. Honestly, you might have severely slowed your metabolism. I know that sounds a little crazy, because eating less should mean you'll get skinner... but I ate, like, nothing fall quarter and after I lost 10 lbs, I started gaining the weight back! I think b/c my metabolism slowed down so much, but then I ate like a little piggy over christmas break and my weight picked up a little, then dropped and stablized after I started eating like a normal person again. I think you should focus on MAINTAINING your healthy weight, rather than being underweight! If you need help to start eating right again, GET IT!! I think we all just want you to be healthy!