This term refers to the emptying of concentrated food directly into the small intestine. Gastric bypass surgery empties food from the small stomach pouch directly into the small intestine without first being diluted with fluids in the rest of the stomach. Therefore, whatever you eat empties directly into the small intestine. Sweets and fatty foods irritate the small intestine and cause discomfort. Eating and drinking fluids simultaneously will also cause this dumping syndrome. This is why we recommend waiting half an hour between eating and drinking.