There are three main types of procedures: 1.Sleeve Gastrectomy creates a small pouch by surgical removal of a large portion of the stomach. This a restrictive procedure which removes an area of the stomach responsible for producing ghrelin the ‘hunger hormone.’, 2. Gastric Bypass Surgery separates the stomach into two unequal compartments. During digestion, the food empties from the tiny stomach pouch into the upper intestine., 3. Gastric Banding is a procedure in which the stomach is encircled with an inflatable plastic band that restricts food intake.