This document discusses essential fatty acids and omega-3 and omega-6 fatty acids. It defines fatty acids and describes their nomenclature and types. Essential fatty acids cannot be synthesized in the human body and must come from diet, including omega-3 and omega-6 polyunsaturated fatty acids. These are important for cell membrane formation, brain and nervous system function, and producing hormone-like substances. The document outlines food sources of omega-3 and omega-6 fatty acids and provides an example structure and synthesis pathway. It discusses the clinical significance of omega-6 in inflammation and eicosanoid production, and some potential benefits of omega-6 fatty acids.