The SADI-S is a biliopancreatic diversion modification. Laparoscopic surgery is also used for this procedure. The passage of food through the duodenum is completely stopped in this procedure, which is similar to the Roux-Y gastric bypass. It is, however, a single anastomosis bypass. To accomplish this, the duodenum is removed blindly and a 200 cm long loop of small intestine is formed, which is anastomosed directly postpylorically with a gastric sleeve. In the event of insufficient weight loss or resumption of weight gain following gastric sleeve surgery, this procedure is especially well suited as a second step. Following the procedure, regular vitamin checks and vitamin substitution are required.