"Cholesterol is a fat-related substance that is essential for good health. It is a normal component of most body tissues, especially those of the brain, nervous system, liver, and blood. "

http://www.afpafitness.com/articles/GoodBadCholesterolLevels...

"Actually, cholesterol is a very valuable and useful substance. It provides the basic structure for the synthesis of steroid hormones and vitamin D and it is a major component of cell membranes, especially high in the brain and nervous system. In the liver it is converted into bile acids and bile salts needed for the digestion and absorption of all lipids and fat-related substances. However, if we are deficient in the emulsifier lecithin or in sulphur amino acids, cholesterol may accumulate as gall-stones."

http://www.health-science-spirit.com/cholesterol.html


"-Include fats and fat-related substances (e.g. cholesterol and phospholipids) "
BIOL 250 Human Anatomy:
Lecture Outlines and Notes.
http://webpages.marshall.edu/~hurlburt/250lec.html