I think at the correct dosages ritalin and adderal are not very catabolic. I am on adderall and I cut my dosage down to only 1/3 of the original dosage that the dr. prescibed. At the full dose, I felt amp all day but at the same time had no desire to work out. It also caused me to get stressed to easily. I ended up gaining weight and losing substantial muscle during this time frame. I can still remember thinking that I might actually lose weight because of the appetitie suppression. But that wasn't the case for me.