The primary role of lipids in the body is to serve as a key source of energy, facilitate the absorption of fat-soluble vitamins, and contribute to the structure of cell membranes. Lipids, such as triglycerides and phospholipids, are essential for maintaining cellular integrity and providing insulation and protection to vital organs. Additionally, lipids play a role in signaling processes, contributing to hormonal regulation and other biochemical functions that support overall health and metabolism.