The body breaks down most carbohydrates from the foods we eat and converts them
to a type of sugar called glucose. Glucose is the main source of fuel for our cells.
When the body doesn't need to use the glucose for energy, it stores it in the liver
and muscles. This stored form of glucose is made up of many connected glucose molecules
and is called glycogen. When the body needs a quick boost of energy or when the body
isn't getting glucose from food, glycogen is broken down to release glucose into the
bloodstream to be used as fuel for the cells.