Katy,Hey. I am 26 now, but at 13, I went through this problem. I just lost interest in eating. At that age (I'm a teacher now of 5th and 6th year olds), girls begin to notice other girls' habits. I had always been small, but suddenly none of my friends wanted to spend break eating, we wanted to flirt and play. I also began to play basketball. I woke up one morning, and my stomach hurt so bad I thought my insides were falling out. Of course, my mom ran me to my doctor. He sat me on the little table, and felt of my tummy. He sat me back up and asked me if I was eating. I said yes. My mom corrected me! He asked me if I wanted to get married some day, and I said yes. He proceeded to tell me that I was not lucky enough to gamble the way my friends were. He told me if I did not swear to eat 3 great meals a day, he would put me in the hospital on IV's until I gained enough weight. I had never been in the hospital, so this scared the daylights out of me. He told me i would die if I did not take control. He told my mom I could have no cokes, and I got to experience my first enema (I don't know how to spell that). Well, needless to say, he got his point across. Oh, I was allowed to refuse any food. I learned to enjoy brussel sprouts. In a few weeks, I was enjoying food! I am telling you this to say that a lot of kids go through this. I didn't have to have antibiotics over this, but I had to have fiber and all of that. Just stress the importance. Up until that point, I thought I was normal and could do what others did. If this doctor had not cared enough to give it to me straight, I probably would have wasted away. I am now at a healthy 120, but it fluctuates according to the season. When it dips to 120, in comes the nutritionists offering me Carnation Instant Breakfasts and milkshakes, and when my weight goes up to 125, I receive praise! Oh, the joys of CF.