Omega-3, omega-6, and omega-9 fatty acids: biological roles and recommended dietary intake levels

From a biochemical standpoint, fatty acids represent a class of organic compounds categorized as monocarboxylic hydrocarbon derivatives, wherein the aliphatic chain serves as the acidic moiety. When combined with glycerol molecules, they form esters—the fundamental constituents of lipids—which play a pivotal role as an energy substrate for cellular functions and as an energy reserve in the form of triglycerides stored within adipocytes. Based on their chemical structure, fatty acids are divided into saturated variants, distinguished by the absence of double bonds between carbon atoms in the chain, resulting in a solid state at room temperature and predominance in animal-derived fats. Conversely, unsaturated fatty acids, which contain one or more double bonds, tend to remain liquid at ambient temperatures and are commonly found in plant-based oils, where they fulfill critical roles in the body’s metabolic processes.