What is cholecystokinin (CCK)?
A. CCK is a natural satiety factor associated with feeling full or satisfied. Specifically, CCK is released by cells in the gastrointestinal (GI) tract when food and/or certain compounds (e.g., PI2) are detected. First discovered in 1928, CCK has an extensive history of research, making it one of the most studied satiety factors in nutritional science.