Sleeve gastrectomy, also called stomach shrinking surgery, entails removing a large part of the stomach, leaving a narrow tube or sleeve. This is also called banana stomach surgery in China. About 100 - 150cc gastric capacity is left after the operation. As the appetite stimulating hormone secreting cells is located in the removed portion of stomach, there is significant decrease in appetite. There are increasing medical reports that this type of operation change gastrointestinal peristalsis and hormone secretion that is beneficial to diabetic control.