What is glycogen?

Glycogen is best understood as a stored form of glucose, which serves as a critical energy reservoir for the body. When the body needs energy, especially during periods of fasting or increased activity, glycogen can be rapidly converted back into glucose to meet energy demands. It is primarily stored in the liver and muscles, providing a readily available source of glucose for cellular functions.

While glycogen is indeed classified as a carbohydrate, emphasizing its role as the storage form of glucose captures its primary function in the body, which is to regulate energy supply. The other options, such as protein and lipid, do not apply in this context, as glycogen is neither of those. It specifically plays a pivotal role in energy metabolism, highlighting the importance of glucose storage and mobilization for bodily functions.