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In a sleeve gastrectomy, part of the stomach is separated and removed from the body. The remaining section of the stomach is formed into a tubelike structure. This smaller stomach cannot hold as much food. It also produces less of the appetite-regulating hormones such as ghrelin, which may lessen your desire to eat. However, the sleeve gastrectomy does not change the anatomy of the intestines or affect the absorption of calories and nutrients.
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