The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries as well as in nanotechnology. Lipids perform 12 / three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. The three main types of lipids are triacylglycerol (also called triglycerides), phospholipids, and sterols. Dietary fats are essential to give your body energy and to support cell growth. They also help protect your organs and help keep your body warm. Fats help your body absorb some nutrients and produce important hormones, too. The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. They are the building blocks of the structure and function of living cells, and important sources of energy.