Bariatric surgery (weight-loss surgery) includes a variety of procedures performed on people who are obese.
Weight loss is achieved by reducing the size of the stomach with an implanted medical device, gastric banding or through removal of a portion of the stomach (sleeve gastrectomy or biliopancreatic diversion with duodenal switch) or gastric bypass surgery (resecting and re-routing the small intestines to a small stomach pouch.
Refer Wikipedia website
Weight Loss Surgery is the most effective method for long term weight loss for those suffering from class II or greater obesity.
Refer further to Aspiring Bariatrics Laparoscopy & Endoscopy website.