Restrictive surgeries: Restrictive surgeries work by physically restricting the size of the stomach and slowing down digestion.
Eg. Sleeve gastrectomy. This procedure generates weight loss solely through gastric restriction (reduced stomach volume). The stomach is restricted by stapling and dividing it vertically and removing more than 85% of it. The stomach that remains is a narrow tube or sleeve, which connects to the intestines. This restricts the amount of food that stomach can hold, as well as removes the portion of the stomach that generates Ghrelin, the hormone that causes hunger. The procedure permanently reduces the size of the stomach and is performed laparoscopically.