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.
Glycolysis. The first stage of carbohydrate metabolism is glycolysis. During glycolysis, glucose, or blood sugar, is broken down in a series of steps to produce a compound called pyruvate. Along the way energy is released. That energy is captured and stored in the form of a compound called adenosine triphosphate, or ATP.