What is the primary storage form of carbohydrates in the human body?

Glycogen is recognized as the primary storage form of carbohydrates in the human body. It is a polysaccharide that is primarily stored in the liver and skeletal muscles. When the body requires energy, glycogen can be rapidly broken down into glucose, which is then utilized by cells for energy production. This storage mechanism is crucial because it allows the body to maintain blood glucose levels during periods of fasting or between meals and to provide immediate energy during physical activity.

In contrast, glucose is the primary monosaccharide and a key source of energy for all cells, but it is not stored in significant amounts. Fructose is another sugar that is primarily found in fruits, and while it can be converted into glucose, it is not a storage form of carbohydrate. Starch is a storage polysaccharide found in plants, not in animals. Therefore, glycogen stands out as the correct answer since it directly fulfills the role of carbohydrate storage in the human body.