A fat-like substance that is found in certain foods and is also produced in the body. Cholesterol travels through the bloodstream in different packages called lipoproteins. Low-density lipoproteins (LDL or "bad" cholesterol) deliver cholesterol to the body, while high-density lipoproteins (HDL or "good" cholesterol) take cholesterol out of the bloodstream. There is a correlation between high blood-cholesterol levels and heart disease.