An article at Diabetes Care suggests that insulin-treated T2 diabetics getting bariatric surgery were almost twice as likely to get off insulin if they had roux-en-Y gastric bypass rather than laparoscopic adjustable gastric banding. The former procedure is also generally more effective for weight loss.
If you think bariatric surgery is a sure-fire cure for type 2 diabetes, it’s not. I would go as far as I could with diet and exercise before going under the knife.
Steve Parker, M.D.
Paleo Diabetic 