I think the answer is heat.
I'm not sure but I know that the liver produces bile. The liver stores sugars but removes others and secretes the bile into the small intestine.
"In the first digestive reaction of starch, a disaccharide called maltose is produced. Maltose consists of two glucose molecules joined together. In humans, the production of maltose from starch occurs within the mouth in a reaction catalyzed by amylase, an enzyme found in human saliva.". I looked it up
