Most of the carbohydrate digestion takes places in the Small Intestine.
Your saliva contains the enzyme salivary amylase, which jump-starts carbohydrate digestion by initiating the breakdown of starch into glucose molecules.Relatively little digestion takes place in your mouth.Even less carbohydrate digestion occurs in your stomach compared to your mouth, as the acidity of your gastric juices inhibits the activity of the amylase from your saliva. Your stomach is still important in carbohydrate digestion, as it continues to move food through your gut and into your small intestine.
Inside your small intestine is where the bulk of carbohydrate digestion occurs. A bicarbonate solution secreted from your pancreas buffers the acidic food mixture coming from your stomach, and the now-neutral environment of your small intestine allows several carbohydrate-digesting enzymes to get to work. These enzymes include pancreatic amylase to complete the process of starch digestion as well as specific enzymes to break down disaccharides, including lactase, sucrase and maltase. Once these enzymes digest their carbohydrates to monosaccharides, these simple sugars are ready for the cells lining your small intestine to absorb them and carry them to your bloodstream.