Weitgh loss with add/adhd medicine concerta, will i gain weight if i stop?

Yes but: If you don't change your lifestyle (lack of exercise) and dietary habit, you may end up gaining even more weight. There is no magic bullet in maintaining weight loss in a long-term basis. Sleep disruption also leads to weight gain.

Only if the number : Of calories consumed is greater than the number of calories burned.

Yes: Stimulant medications like Concerta and Adderall (dextroamphetamine and racemic amphetamine) can cause a significant appetite suppression, leading to weight loss. If you feel the Concerta is handleing your ADHD symptoms well, Do not skip meals, eat by the clock, eat calorie dense foods and consider appetite stimulant periactin.