In general, these operations either tie off part of the stomach with a band to limit its size or actually reroute the gut to both reduce the stomach pouch and bypass part of the intestine.

• 一般而言，这类手术不是以橡皮带将一部份的胃扎起，以缩小体积，就是把胃肠重新改道，以减少胃的体积及不让食物通过某段肠子。