The most common type of steroid in the body. Cholesterol has a reputation for being associated with an increased risk for heart and blood vessel disease. ... Cholesterol is also necessary to the normal permeability and function of the membranes that surround cells.
There are two types of cholesterol; LDL (low-density lipoproteins, bad cholesterol) and HDL (high-density lipoproteins, good cholesterol). ... Cholesterol is an essential substance that is produced by the body but is also ingested from animal-derived foods.