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.
Most carbohydrates are broken down by the process of chewing the food and mixing it with enzymes. Hopefully that food had viable enzymes to mix with the enzymes supplied by the mouth. Pre-digestion in the Stomach. After swallowing the food, it moves down the esophagus, which is 18 to 24 inches long.