It is the most abundant phospholipid in our diet and our body. B. Function 1. Major constituent of cell membranes, forming a bilayer. Phospholipids are not essential nutrients. Other meat products are the next most abundant source of dietary cholesterol.
Plants do contain other sterols but they never contain cholesterol.
C. Functions 1. Cholesterol is an important component of cell membranes. Cholesterol is the starting material for the synthesis of many important compounds in the body.