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Morbid obesity is linked to increased incidences of glucose intolerance, Type 2 diabetes mellitus, cardiovascular diseases, various forms of liver disease, and specific forms of cancer. Treatment of obesity by lifestyle modifications (i.e. changes in diet and exercise) and drug therapy is generally ineffective. Bariatric surgery is currently the most effective means of treating obesity and related disorders. We as well as others have developed surgical procedures for application to genetic mouse models that mimic an array of human bariatric surgical procedures used in the treatment of obesity. The application of bariatric surgery to genetic mouse models will broaden our understanding of the role of the gut in metabolic disease. Models that have been developed include gastric banding, sleeve gastrectomy (SG), Roux-en-Y gastric bypass (RYGB) with a complete exclusion of the stomach, duodenal-jejunal bypass (DJB) and biliopancreatic diversion (BPD). The detailed methods of these procedures are provided.