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.
Carbohydrates are a major source of energy, especially for the brain, which runs on glucose. Carbohydrates convert to glucose during digestion. There are two classes of carbohydrates: Simple carbs, like sugar, lack nutrients such as fiber to enhance their nutrient profile. Complex carbs, like those found grains, have vitamins and minerals that make them a healthier option.