The common explanation of how this device works is that with the smaller stomach pouch, eating just a small amount of food will satisfy hunger and promote the feeling of fullness. The feeling of fullness depends upon the size of the opening between the pouch and the remainder of the stomach created by the gastric band. The size of the stomach opening can be adjusted by filling the band with sterile saline, which is injected through a port placed under the skin.
Reducing the size of the opening is done gradually over time with repeated adjustments or “fills.” The notion that the band is a restrictive procedure (works by restricting how much food can be consumed per meal and by restricting the emptying of the food through the band) has been challenged by studies that show the food passes rather quickly through the band, and that absence of hunger or feeling of being satisfied was not related to food remaining in the pouch above the band. What is known is that there is no malabsorption; the food is digested and absorbed as it would be normally.
The clinical impact of the band seems to be that it reduces hunger, which helps the patients to decrease the amount of calories that are consumed.
Reduces the amount of food the stomach can hold
Induces excess weight loss of approximately 40 – 50 percent
Involves no cutting of the stomach or rerouting of the intestines
Requires a shorter hospital stay, usually less than 24 hours, with some centers discharging the patient the same day as surgery
Is reversible and adjustable
Has the lowest rate of early postoperative complications and mortality among the approved bariatric procedures
Has the lowest risk for vitamin/mineral deficiencies
Slower and less early weight loss than other surgical procedures
Greater percentage of patients failing to lose at least 50 percent of excess body weight compared to the other surgeries commonly performed
Requires a foreign device to remain in the body
Can result in possible band slippage or band erosion into the stomach in a small percentage of patients
Can have mechanical problems with the band, tube or port in a small percentage of patients
Can result in dilation of the esophagus if the patient overeats
Requires strict adherence to the postoperative diet and to postoperative follow-up visits
Highest rate of re-operation