Gastrin is a hormone produced by the stomach that plays a key role in digestion. It stimulates the secretion of gastric acid, which helps break down food and aids in the absorption of nutrients. When you eat, especially protein-rich foods, your stomach releases gastrin to ensure that the digestive process runs smoothly. In addition to promoting acid production, gastrin also encourages the growth of the stomach lining and helps regulate the movement of food through the digestive tract. This hormone is essential for maintaining a healthy digestive system and ensuring that your body gets the nutrients it needs from the food you consume.