The stomach can’t grow again after half of it is cut off because the stomach has no regeneration function. If the stomach tissue cannot be produced again after half of it has been cut off, because the stomach tissue cells do not have the function of regeneration, therefore, after gastrectomy, the patient’s stomach capacity will be temporarily reduced, but the long-term effect is not very great because the stomach capacity is likely to expand gradually. The stomach has a certain tolerance for expansion, and after half of the stomach has been removed, with the expansion of each meal, it will lead to another expansion of the stomach volume, which is not able to return to the state before the operation, but it will not affect the diet too much. After half of the stomach is removed, the patient should pay attention to adjusting the diet, should be small and frequent meals, try to avoid eating too much at one time, so that the stomach has a gradual process of adaptation.