What inherited metabolic disorders affect carbohydrates?

Carbohydrates are sugar compounds that are found in a wide variety of foods, from bread and pasta to fruits and vegetables. Enzymes in the body help to properly break down these compounds so that the body can use them in the ways that it needs to. In some cases, a genetic defect causes these enzymes to be missing or to function improperly. When this happens, substances that should be broken down build up, or the body fails to make a substance that it needs to, and a metabolic disorder develops. Metabolic disorders that affect carbohydrates include mucopolysaccharidoses, Forbes' disease, and McArdle's disease.