An optimal low-density lipoprotein level is 100 milligrams or less per deciliter of blood, according to the National Heart, Lung and Blood Institute. An LDL level of 190 milligrams per deciliter of blood is very high. Drug treatments and lifestyle changes lower LDL levels.
LDL builds up, creating blockages in the arteries, as stated by the NHLBI. High-density lipoprotein removes LDL from the bloodstream. Reducing cholesterol and saturated fat intake, eliminating trans fats and eating more soluble fiber reduces LDL. High blood pressure, obesity, advanced age and cigarette smoking raise LDL, and heredity affects how much LDL the body produces.