The following foods are allowed in a clear liquid diet: Water (plain, carbonated or flavored) Fruit juices without pulp, such as apple or white grape. Fruit-flavored beverages, such as fruit punch or lemonade. Carbonated drinks, including dark sodas (cola and root beer) Gelatin.
Your body has a mechanism and set of enzymes for digesting the carbs, protein and fat molecules in your food. Chemical digestion occurs in several steps beginning in the mouth and ending with absorption in the small intestinal cells.
Carbohydrate digestion begins in your mouth as special enzymes in the saliva start to break complex carbohydrates down. The product that continues passes through the stomach and into the small intestines where more enzymes break carbohydrates down into the simplest form of sugars that the body can use for energy.