Gastric bypass is a type of surgery for weight loss which may be used to treat obesity. during the procedure a small pouch is created in the stomach which is connected to further along the small intestine. (refer to anatomy and physiology of the gastrointestinal system for further information). Food can thus bypass or divert away from parts of the stomach and intestines. This reduces absorption of fats and calories (causing weight loss) but can also lead to reduced absorption of important nutirents (malnutrition).

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