Several other lipids are also found in your body. Some are vital components of your brain. An important group includes phospholipids, which resemble triglycerides in structure – the main difference is that one of the fatty acid groups is replaced by one that contains phosphorus.ipids are substances that do not dissolve in water but are soluble in organic solvents such as chloroform or dry cleaning fluids. Other important types of lipid include triglycerides and fatty acids. Lipids have several important roles in the body, providing: