While a tummy tuck will reduce the size of one's abdomen and reshape the waistline, it has very little to do with one's true stomach. One's abdominal area gets big because of the accumulation of fat and stretching of the skin and stomach muscles. It is not due to the size of one's stomach which lies behind the abdominal wall muscles and is surprisingly small compared to the shape of one's abdomen. One may feel fuller after eating after a tummy tuck for awhile due to the pressure on the stomach as it expands with food due to the tightened abdominal muscles which lie in front of it. That feeling will pass several months after surgery as one gets used to it. Some may argue that this is an additional benefit of a tummy tuck because it makes you want to eat less. How long the shapely results of a tummy tuck last does partially depend on the stability of one's weight. If you gain weight, you will likely thicken up your middle. Barring future pregnancies, however, excess and loose abdominal skin will not recur.