Severely obese or have medical condition related to being obese + BMI > 40 without comorbidities or BMI > 35 with comorbidities Patient needs to have tried to lose weight in other ways (e.g., healthy eating, dieting, exercising, attempt to other lifestyle change) Patient will need to attent classes to understant how the body will react to the surgery, and how they need to make lifestyle changes so the surgery will be effective