Hypocholesterolemia's the presence of abnormally low (hypo-) levels of cholesterol in the blood (-emia). Although hypercholesterolemia, the presence of high cholesterol, has been linked strongly with cardiovascular disease, a defect in the body's production of cholesterol can lead to adverse consequences as well. Cholesterol's an essential component of mammalian cell membranes and's required to establish proper membrane permeability and fluidity. Several genetic defects exist in the production o… (More on Hypocholesterolemia)