In this operation, the size of the stomach is drastically reduced down to a tube about the size and shape of a banana. About two thirds of the stomach is permanently removed. This operation preserves the pylorus, which is the valve leaving the stomach. It does not involve bypassing any intestines.
There are three effects: restriction, dumping, and reduced appetite. Every individual person undergoing sleeve gastrectomy experiences different degrees of each effect. All of these effects work together to help a person drastically reduce the calories he or she consumes.
The much smaller stomach means you will be able to eat most, if not all types of food, but fill up much faster. About a cup to a cup and a half of food is what most people can comfortably eat.
While not as much as with gastric bypass, with a sleeve gastrectomy, you may experience unpleasant reactions to certain foods, especially high calorie liquids and sweets. Dumping can include nausea, diarrhea, cramping and low blood sugar. It is what helps you stay away from junk foods.
As with Gastric Bypass, Sleeve Gastrectomy reduces a “hunger hormone” called ghrelin.
After sleeve gastrectomy, a person may not digest all of the calories in the food they eat. This is a minor effect of the surgery.
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