According to this story, the gastric bypass surgery was done in 2007 and supposedly performed by an expert. I underwent gastric bypass surgery in 2013 and this story doesn't make much sense from my perspective. Before and after surgery, I underwent many steps. Firstly I had to undergo a psychiatric evaluation to see if I was qualified for the surgery, if there were underlying psychiatric issue that drove the weight gain, they had to be remediated prior to approval for surgery. In order to qualify for the surgery, my insurance required that I undergo a six month program of weight loss and exercise. I had to attend monthly support group meetings. Then there were a variety of medical tests that were performed to detect any medical conditions that may affect the outcome. So over a year went by since I started the process before I had the surgery. I also underwent a day of classroom training prior to the surgery that included very detailed information covering almost every aspect of the surgery and what was to follow and given a 1 inch binder of material to constantly refer to.
After the surgery, I lost 120 pounds over the first 7 months. It was difficult because of the extent of the requirements (food types, food volumes, vitamin, etc.) But overall I was please with the surgery.
Then there was yearly follow-ups. Gastric bypass surgery requires that the individual must take many types of vitamins for the rest of their lives. If someone fails to take those, their bodies will experience Vitamin deficiencies which caused damage in multiple organs. That is known up front. Every year for the first 5 years, I underwent extensive blood work. These test measured my various vitamin levels and allowed my doctor to fine tweak the vitamin levels.
Also there was a mechanism in place for a psychologist in the event that psychological problems arose post surgery.
There are many people involved in this process, not just the surgeon. They included nutritionist, psychologist, support group meetings etc.
In order for this surgery to work effectively, it depends upon the compliance of the patient to follow the guidelines given and seek help when problems arise.