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.
Digestion takes place whenever and wherever food comes into contact with digestive enzymes. Salivary glands at the base of the tongue secrete enzymes that begin the digestion of carbohydrates. Enzymes secreted by the lining of the stomach are involved in protein, fat and milk digestion.