Cholesterol belongs to the lipid group of macromolecules and is a member of the group of sterols. The main functions of lipids include storing energy, signaling, and acting … as structural components of cell membranes.Lipid is sometimes used as a synonym for fats. 7 people found this useful. Reducing Your LDL With Drugs and Diet The basic rule of thumb suggests that you want to have a low LDL (bad cholesterol) and a higher HDL (good cholesterol). 2  Levels of the artery-clogging waxy substance tend to r…. 3  Using Alcohol to Improve Cholesterol Drinking alcohol can affect your health in many different ways.