Gastric diversion for type 2 diabetes indications and contraindications Indications for surgery: 1, meet the diagnostic criteria for type 2 diabetes 2, have certain islet function (plasma insulin level > 1/3 of the normal value) 3, age ≤ 65 years (can be relaxed if in good health) Contraindications for surgery 1, islet failure, autoimmune diabetes (LADA) 2, serious organic diseases (coronary heart disease, cerebral infarction, kidney failure, heart failure, etc.) can not tolerate surgery; 3, gastrointestinal tract dysfunction, moderate to severe gastric diplegia; 4, age > 65 years