Laparoscopic vertical sleeve gastrectomy (also known as gastric sleeve or the sleeve) is a procedure which removes upwards of two-thirds of the stomach. This drastically reduces the amount of food youre able to eat. Patients feel fuller with much less food, thereby consuming less calories. This procedure does not reroute or bypass any intestine. It divides the stomach using special surgical staplers. The remaining part of the stomach is a tubular stomach about the size and shape of a banana, and is resistant to stretching.