Following this surgery, only a small amount of food can be eaten before the pouch is full. The food then passes through the small opening created by the band and is digested normally.
After the band is placed, patients will need to come back to the hospital for a band adjustment. The band has an adjustable "balloon" that is filled by injecting fluid into a port placed under the skin. Injecting fluid into the port will decrease the size of the opening. Extracting fluid from the port will increase the opening. The number of adjustments needed varies from person to person, but most need between 3 and 5 before the band is at its ideal tightness.