What is the main function of insulin in the body?

Insulin is a hormone produced by the pancreas that plays a crucial role in regulating blood glucose levels. Its primary function is to facilitate the uptake of glucose into cells, allowing them to use it for energy or store it as glycogen in the liver and muscles. Insulin also helps regulate fat and protein metabolism, promoting the storage of nutrients and inhibiting the production of glucose by the liver. Overall, insulin is essential for maintaining metabolic homeostasis in the body.