In normal conditions cholesterol is a fat (lipid) produced by the liver and is essential for body functions. Cholesterol is naturally present in cell walls or membranes everywhere in the body, including brain, nerve, muscle, skin, liver, intestines, and heart. Under normal conditions cholesterol also serves as a builder and guardian of the cell membrane, filter incoming molecules and not into the cell, involved in the production of sex hormones, helps produce bile.
But if someone has too much cholesterol in the bloodstream, the excess can be stored in the arteries, including coronary heart, arteries to the brain, and arteries that supply blood to the legs. Ttherefore high cholesterol is not a disease, but people with high colesterol has the potential of developing the disease.