Peptide YY (PYY) is a hormone produced in the gut, specifically in the ileum and colon. It plays a crucial role in regulating appetite and digestion. When we eat, PYY is released into the bloodstream, signaling to the brain that we are full, which helps reduce hunger and food intake. This hormone works by slowing down the movement of food through the digestive system and inhibiting the release of ghrelin, another hormone that stimulates appetite. By balancing these hormones, PYY helps maintain a healthy weight and supports overall metabolic health.