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.
The goal of carbohydrate digestion is to break them down into individual sugars so that your bloodstream can absorb them from intestinal cells. The process starts in your mouth but occurs mostly in your small intestine, where carbohydrate-specific digestive enzymes clip off sugars from the larger carbohydrate molecules.