Cholesterol and triglycerides are the main forms of fat carried in the blood stream. These can be derived partly from the foods we eat and partly from the body’s own production by the liver. Since fats are not water soluble they cannot be eliminated from the body very easily. There are mainly four types of lipoprotein called as Chylomicrons, VLDL, LDL and HDL. LDL is the main carrier of cholesterol and some pieces of cholesterol get stuck to the blood vessel walls narrowing the walls.