what is the definition cholesterol
Cholesterol is a type of fat (lipid) in your blood. Your cells need cholesterol, and your body makes all it needs. But you also get cholesterol from the food you eat. If you have too much cholesterol, it starts to build up in your arteries. (Arteries are the blood vessels that carry blood away from the heart .) This is called hardening of the arteries, or atherosclerosis. It is the starting point for some heart and blood flow problems.