Overview
Glycogen is a type of polysaccharide molecule that is the main form of stored energy, or glucose, in animals and fungi. It is a major energy source for the body, providing energy for activities such as walking and running. Glycogen is a complex carbohydrate created within cells from glucose that has been absorbed in the bloodstream. Glycogen is also known as animal starch as it is the main storage form of glucose in animals. In addition to providing energy, glycogen is important in the regulation of glucose levels and is involved in glycogenolysis, the process of releasing glucose into the bloodstream. Glycogen has many uses in the body, including muscle and liver metabolism and controlling blood sugar levels.