This procedure is both "restrictive" and "malabsorptive". Generally performed by laparoscopic technique, this procedure creates a small stomach pouch decreasing the amount of food one is able to eat. In addition, a portion of the small intestine is bypassed leading to decreased absorption of the calories and nutrients eaten. This procedure is currently the most common operation performed for weight loss in the United States. The weight loss is typically faster with this procedure when compared to the Lap-Band, but does require more rigorous vitamin supplementation and is not "adjustable" post surgery.