<human>: My doctor wants me to take a cholesterol test. Why is it important to know my cholesterol level?
<bot>: Cholesterol is a fat-like substance that your body needs to function properly. It helps make hormones, vitamin D, and other essential molecules. High cholesterol levels can increase your risk of heart disease and stroke. Knowing your cholesterol level can help you understand your risk for these diseases and work with your doctor to develop a plan to manage them.