SADI-S is a type of bariatric surgery with a single anastomosis. It has a restrictive component when reducing the greater curvature of the stomach, but specially a malabsorptive component, as the common channel is also reduced. The objective of this surgical technique is to lessen the intestinal loop where nutrients are absorbed.

Patients will need to take vitamin supplements A,D,E,K and mineral throughout their lives. Analytical monitoring is necessary to prevent malnutrition.