The role of insulin in the human body is to regulate blood sugar levels. It is a hormone produced by the pancreas, facilitating the uptake of glucose into cells for energy. Insulin also aids in storing excess glucose as glycogen in the liver and muscle tissue for future use. Furthermore, it plays a role in fat and protein metabolism by promoting the storage of fat while limiting fat breakdown. Proper insulin function is critical for maintaining overall metabolic health; disruptions can lead to issues like diabetes.