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More weight loss seen with gastric bypass than banding
USA Today

Gastric bypass surgery results in faster and longer-lasting weight loss than does gastric banding, according to a new study by Swiss investigators. A gastric bypass operation called Roux-en-Y involves reducing stomach size with staples and connecting the smaller “pouch” directly to the small intestine. It is irreversible. Gastric banding, as its name implies, involves placing a band around part of the stomach to reduce its size. This procedure is reversible, the researchers noted.

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