Being an RN and having worked with many patients in my hospital's gastric bypass program, I have to chime in and tell about some success stories, because there are alot of them. The hospital I work for has a very strict program, patients must go through months of therapy, group, individual, and nutritional. Alot of these patients would not live more than a few years without the surgery. They often have multiple medical problems besides morbid obesity. Diabetes, cardiac disease, hypertension just to name a few. The risks of the surgery are less than the risk of living with the excessive weight.
I have watched people go from being able to only walk a few steps, to being able to work out at the gym 3 times a week. (hospital gym supervised by clinical staff). I worked with a patient who was on multiple medications for Diabetes, and hypertension, as the weight came off she got rid of the meds for high blood pressure, and now controls her diabetes with diet only. The emotional changes are fantastic for people. I had one patient who hadn't been into a store to buy clothes for years.
Any type of surgery has risks, make sure if you are considering this type of surgery, that they have a program set up. Make sure that you will have after care, and support groups. Make sure that you are willing to make the life style changes, and are willing to follow the diet, But most of all make sure it is the right thing for you.