What is a major function of insulin in the body?

Insulin plays a crucial role in regulating blood glucose levels in the body. When blood glucose levels rise after eating, insulin is secreted by the pancreas and facilitates the uptake of glucose by cells, particularly muscle and fat cells. This process not only lowers blood glucose levels, preventing hyperglycemia, but also promotes the storage of glucose as glycogen in the liver and muscles, and encourages the conversion of glucose into fat when in excess. Thus, its primary function is to maintain glucose homeostasis and provide cells with the energy they need for metabolic processes. This action is vital for overall health and energy balance in the body.