"i was diagnosed with add about ten years ago. i was prescribed concerta by my doctor and it wasn&#039;t an easy transition. i got tons of work done and all, but it killed my apetite during lunch hours and as a result i lost weight. as time went on i got more used to the medication and i&#039;ve since regained my weight (for the most part, i&#039;ve still got a high metabolism and as a result gaining any kind of weight is difficult for me) and can still focus on my schoolwork. part of this can be attributed to getting older and all, but i think the medication has certainly helped. for reference, i&#039;m a 6 ft tall guy who weighs around 125 lbs."