What is the primary function of insulin in the body?

The primary function of insulin in the body is to control blood sugar levels. Insulin is a hormone produced by the pancreas that plays a crucial role in glucose metabolism. When you eat, your body breaks down carbohydrates into glucose, which is then released into the bloodstream. Insulin helps regulate the amount of glucose in the blood by facilitating its uptake into cells for energy or storage, thereby lowering blood sugar levels.

This regulation is vital because consistently high blood sugar levels can lead to serious health issues such as diabetes. Insulin also helps balance other metabolic processes, but its main role revolves around maintaining normal blood sugar levels, making the control of blood sugar the correct answer in this context.