I have bi polar and adult ADHD. I have the gastric surgery about 18 months ago. I didn't have a problem with my doctor as I think my weight had contributed to alot of episodes of depression. Since the surgery I have realised that my weight wasn't really the problem, it was my head all along. Being thinner won't make you happy - as long as your honest with your doctor and on your medication you'll be fine. Oh and by the way I've lost 47 kilos in 18 months.