Overgrowing the food digestion system microstructure explores the process of food breakdown at a molecular level. The gastric juice contains hydrochloric acid and pepsin enzyme which convert proteins into polypeptides. Enzymes in the intestines break down the starch into simple sugar molecules. The lipase enzyme separates fats into glycerol and fatty acids. The bile acids extracted from the liver emulsify the fats, which facilitates fat digestion. Proteins, carbohydrates, and fats are assimilated into monomers, serving as essential energy and building materials for the body