Cholesterol is a fat-like substance called a lipid that is essential for
human life. A component of every body cell, it helps to maintain the stability
and fluidity of cell membranes. Cholesterol is also used in the liver to produce
cholic acid, a major constituent of the bile fluid necessary for the digestion
of fat. In addition, cholesterol is the material used by the body to build
hormones such as estrogen and testosterone.
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