a substance in animal tissue that is an essential
component of cell membranes and nerve fiber insulation. Cholesterol is
important for the metabolism and transport of fatty acids and in the production
of hormones and Vitamin D. Cholesterol is manufactured by the liver, and
is also present in certain foods (e.g., eggs, shellfish). There are 2
types of cholesterol in the blood, high-density (HDL) and low-density
(LDL) lipoproteins. Very low cholesterol levels may indicate malnutrition.
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