SADI – S (Simple duodeno – ileal bypass anastomosis with sleeve gastrectomy) is a bariatric surgical technique for weight loss. SADI – S is a type of bariatric surgery type with a single anastomosis. It has a restrictive component when reducing the large curvature of the stomach, but especially a component of malabsorption, the common channel is also reduced. The goal of this surgical technique is to reduce the bowel loop where nutrients are absorbed.