Cholecystokinin, also known as CCK, is produced by endocrine cells in the first part of the small intestine, the duodenum. The job of this hormone is to stimulate the pancreas so that this can release its pancreatic acid, which has enzymes necessary for the digestion of fats, carbohydrates, and proteins. Also, this hormone stimulates the release of bile, which will contribute to the digest of fats.
The other function that cholecystokinin has is to suppress hunger, in other words, is the responsible of satiety.
