The amylase enzyme in the pancreas causes the breakdown of starch. Starch, during the chemical reaction, breaks down into disaccharides, lactase, sucrase and maltase, forms of pure sugar. Disaccharides are broken down into monosaccharides. Lactase changed to lactose, then glucose and galactose, sucrose changed sucrose to glucose and fructose, these are all forms of sugars. These sugars may not all be used by the body. Maltase breaks down maltose 2 into glucose molecules. Protein: Pepcid and HCI in the stomach break down proteins. These proteins continue during the chemical reaction to transform into polypeptides. In the small intestine, trypsin breaks down proteins and polypeptides into dipeptides. Then the dipeptides are transformed into chymotrypsin, breaking down proteins and polypeptides into dipeptides. Carboxypeptidase breaks down polypeptides and dipeptides into amino acids. Aminopeptidase disintegrates polypeptides and dipeptides into amino acids. Dipeptidase dissects dipeptides into amino acids. Amino acids are used more by the digestive process; These are the building blocks of proteins. Fats trigger the chemical digestion process in the mouth, perhaps because many fats take longer to break down. Lingual lipase plays a minor role in starting fat digestion. The stomach undergoes an immense amount of chemical reactions at the same time.