A form of the cholesterol molecule, if present in large numbers in our bodies, can form deposits known as plaque on the walls of our arteries, which can in turn block the flow of blood supply and cause heart problems. In the formation of sex hormones (so definitely can t be all bad). Cholesterol molecules help the cells to withstand temperature fluctuations and also protect the nerve fibers. Cholesterol molecules help in digestion of food through production of bile salts. HDL Cholesterol molecules act as a broom and sweep LDL Cholesterol molecules from the arteries. The conversion of Vitamin D from sunlight is helped by the cholesterol molecule. cnn money