Lipids are fatty, oily compounds that are found in your bloodstream and your body's cells. Cholesterol and triglycerides are both made out of lipids. High cholesterol, a well-known risk factor for heart disease and stroke, affects about 1 in every 3 American adults. LDL cholesterol is known as the "bad" type of cholesterol because it forms plaques in your arteries, which can restrict the flow of blood and ultimately result in heart disease. Browse these articles written by medical experts to learn more about cholesterol and lipids, plus find out more about our Cholesterol Test.