Ritalin is a stimulant and more often than not, it acts as an appetite suppressant. Weight gain is not usually a side effect of this or other stimulant medications. Your doc should've gone over potential side effects with you.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days