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Cholesterol can be both good and bad, so it's important to learn what cholesterol is, how it affects your health and how to manage your blood cholesterol levels. 

Cholesterol is a waxy steroid metabolite found in the cell membranes and transported in the blood plasma of all animals.  It is an essential structural component of mammalian cell membranes, where it is required to establish proper membrane permeability and fluidity. In addition, cholesterol is an important component for the manufacture of bile acids, steroid hormones, and several fat-soluble vitamins. Cholesterol is the principal sterol synthesized by animals, but small quantities are synthesized in other eukaryotes, such as plants and fungi. It is almost completely absent among prokaryotes, which include bacteria..