normally occurring fatty substance in the body of importance for cells and hormone production; cholesterol is obtained through diet or the body’s own production in the liver; the excess is stored in the body which can lead to atherosclerosis: LDL beta-lipoprotein, called “bad cholesterol,” high levels of which increase risk of cardiovascular disease; HDL alpha-lipoprotein, called “good cholesterol,” which has a protective effect against cardiovascular disease.