About a dozen or so hormones are responsible for making us feel full.
GIP and GLP-1 are responsible for stimulating the production of insulin to regulate the metabolism of carbohydrates.
Other hormones are involved in slowing down the movement of food through the stomach.
CKK and PYY are vital in reducing the feeling of hunger. (Increased PYY causes a loss of appetite and is particularly high in patients who have a gastric band fitted to reduce the size of the stomach.)