The enzymes that are produced in the stomach are gastric enzymes. The stomach plays a significant role in digestion, both in a mechanical sense by mixing and crushing the food, and also in an enzymatic sense, by digesting it. Several other enzymes help aid in digestion; hydrochloric acid is produced in the stomach by parietal cells. Pepsinogen changes the protein within the food, and it activates digestion.
The stomach produces an intrinsic factor and a hormone called gastrin. Intrinsic factor helps with vitamin B-12 absorption and gastrin stimulates the release of hydrochloric acid. Alpha Amylase is found in saliva, and it is responsible for beginning the metabolism of fat. Gastric lipase exists within the stomach, and it works best by breaking down fat.