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Bariatric surgery, derived from the Greek word "baros" meaning weight, is designed to reduce obesity indirectly by restricting the amount of food calories a person can digest. Some bariatric operations (eg. lap band) achieve this by reducing the size of the stomach size. Other operations (eg. roux-en-Y gastric bypass) go one step further. As well as reducing stomach volume, they also reduce the length of the small intestine. This constitutes a more permanent alteration of the digestive tract and makes it more difficult for the patient to cheat.
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