What happens to the rest of the stomach after gastric bypass surgery?

After gastric bypass surgery, the rest of the stomach remains in the body. The blood vessels that supply blood to the stomach remain intact. The rest of the stomach won't shrivel. 


Also, the stomach has more functions than just food store. The stomach makes gastric acid and juices. It also makes gastrointestinal hormones and other substances that the body needs.


All these processes continue, even if the stomach remains empty for the rest of your life.