In gastric bypass surgery, a small 30 cc (1 ounce) gastric pouch is formed from the upper part of the stomach. A section of the upper intestine is connected to the small gastric pouch through a Y-shaped connection. As a result, patients eat less food, and somewhat less nutrients are absorbed. This surgery takes from 1 to 3 hours and most patients will be able to leave the hospital on the second or third day after surgery.
Potential surgical candidates should know and understand that in some people, this type of surgery can cause “dumping syndrome” in which eating sweet foods or drinking sweet drinks can lead to a dizzy, sweaty, queasy feeling. Patients who have this syndrome are therefore discouraged from eating sweets, which actually helps with weight loss because sweets are high in calories and usually low in nutrition.