The process begins in the mouth when an enzyme in saliva (amylase) begins to break down starchy carbohydrates.After swallowing, the starchy carbs reach the stomach where hydrochloric acid combines with them and acts on the protein in the food. The stomach also acts as a reservoir for food, squirting out small amounts into the intestines at intervals.In the small intestine (where most carb-digestion occurs) the starch is processed by the enzyme amylase and converted into maltose and sucrose.The maltose and sucrose are then absorbed into the lining cells of the intestine and are further simplified, being converted into glucose.