The primary function of insulin in the body is to regulate blood sugar levels. Produced by the pancreas, insulin facilitates the uptake of glucose from the bloodstream into cells for energy or storage as glycogen in the liver and muscles. It also plays a role in fat metabolism and protein synthesis. By ensuring that glucose levels remain stable, insulin helps prevent hyperglycemia (high blood sugar) and supports overall metabolic health. Dysfunction in insulin production or sensitivity can lead to conditions like diabetes.