i know alot lot of people wouldnt complain about losing 30 lbs in 1 1/2 years, well here it is, a 1 1/2 ago i weight about 142lbs or so and now im 112lbs and im 5"3, 19 years old, the thing is i dont know how i lost all that weight i eat alot(mostly fast food), dont excercise, i smoke and i work at fast food, and i went to the doctors and he said im 2 lbs from being underweight and i need to gain weight, thats my problem i cant gain wieght and im afraid that if i keep losing my heath is going to be bad and ill be disgusting looking, my bones already show a lil bit through my skin and its disgusting, but anyways i tried eating alot more and getting carbs in my system but it seems the more i eat the more im losing and i dont know what to do cause all the doctor tells me is to eat more, but it doesnt work and i dont feel like going back because i know people wouldnt worry about it because they are skinney and blah blah blah, but i AM worried, i dont want health problems and im weak, do you think trying to excercise and gain musle will help? or do you think it is just my metabolism?...plz help me out