Cholesterol does many important jobs in a cell. Cholesterols main function is as a structural component of cell membranes. It is also the starting material for bile acids that are made by the liver and used to digest fats, and for steroid hormones. However, it is best known for something bad that it does. High levels of cholesterol can lead to atherosclerosis. This is an inflammatory disease of artery walls in which white blood cells invade the vessel wall and become engorged with cholesterol and other lipids. These 