Bariatric surgical procedure causes weight loss by limiting the quantity of food the stomach can hold, causing malabsorption of nutrients, or by a blend of both gastric restraint and malabsorption. Bariatric procedures also habitually cause hormonal changes. Most weight loss surgeries now-a-days are performed using negligibly invasive techniques like laparoscopic surgery.
The most common bariatric surgery procedures are sleeve gastrectomy, gastric bypass, biliopancreatic diversion with duodenal switch and adjustable gastric band. Each surgery has its own benefits and side effects.