It consists in promoting only a restriction in the alimentary volume ingestion by a surgical confection of a new gastric reservoir, in general, with a capacity of 50ml. Ex: Sleeve Gastrectomy and Adjustable Gastric Band.
Malabsorption Procedures: it consists of the surgical exclusion of a segment of the intestine from the alimentary path. The stomach may or may not be kept intact. Ex: Duodenal Switch.
Mixed procedures: are considered gold standard in the treatment of obesity, since these surgeries associate restriction and malabsorption procedures simultaneously. Ex: Chapel Surgery or Bypass Y of Roux.