Roles and Functions of Fats in the Body 1. Most lipids are the building blocks of the human body. (The concept of lipid is a broad concept that includes fats, oils, fatty acids, phospholipids and steroids. For detailed information on lipids, see Lipids; Classification, Fatty Acids, Fats, and Oils) 2. Fats are the body’s energy reserves. Excess calories ingested are stored as fat. For example,…