The enzymes we need to consider when planning our diets are called food enzymes. These are present in raw foods and they initiate the process of digestion in the mouth and upper stomach. Food enzymes include proteases for digesting protein, lipases for digesting fats and amylases for digesting carbohydrates. Amylases in saliva contribute to the digestion of carbohydrates while they are being chewed, and all enzymes found in food continue this process while it rests in the upper portion of the stomach.