Hi Matt When my daughter was first diagnosed with CAH at 3 yrs of age, she was considered very underweight. From that point on, she was given hydrocortisone...and .... yes definitely, weight was a big issue. She slowly but surely crept up to the higher percentiles for weight. I'm not one for denying kids something to eat when they say they are hungry but it sure was a challenge. We sought the help of a good dietician and we went through a lot of raw carrots, celery, apples, etc. We encouraged her to be active and she was in swim classes, track and soccer. Still the weight climbed. She was kept on the hydrocortisone until she was 13. By that time she weighed about 150 lb. When the endo was certain that she reached her maximum height, my daughter was given prednisone and within 6 months was also told to take fludrocortisone. Also at this time, she increased her activity somewhat (swimming, hockey, soccer, basketball and volleyball). We also read through the info from Weight Watchers for teens and we cut back on fruit juices (often high in sugar)and cheese(a high fat dairy product). Instead she ate whole fruits and drank water and ate lots more vegies. She continued to drink adequate amounts of milk but now looking back, maybe a litre of milk a day even if it was 1% was somewhat excessive. She reduced it to 3 glasses per day. Her weight started dropping slowly but surely (about 1/2 pound a week...not sure what that is in stones). She now weighs about 118 lb and is about 5'2".... and while she is certainly not skinny, she is maintaining that weight. I am certain it was the entire combination of switching to the prednisone, the extra activity and truly watching what she eats. I hope this helps....I know it is not easy. P.S. My daughter says that she remembers feeling hungrier when on the hydocortisone than the prednisone. You can check with a pharmacist on this. Good luck!