Sleeve gastrectomy is believed to be simpler than gastric bypass. Instead of rearranging the anatomy of the stomach and small intestine, the stomach is resized to affect weight loss in sleeve gastrectomy. The significant advantage of gastric sleeve surgery is that it does not create a new connection between the stomach and small bowel. Long term complications which are common in gastric bypass surgery are less likely to happen in gastric sleeve procedure. In addition, if some patients are too heavy for gastric bypass surgery, doctors will choose to perform sleeve gastrectomy.