Since "poly" stands for numerous and "unsaturated" stands for double bonds, the term "polyunsaturated" alludes to their chemical composition. Together, they indicate that double bonds are common in omega-3 fatty acids. The term "Omega-3" designates the location of the last double bond in a chemical structure, which is three carbon atoms from the molecular chain's "omega" or tail end. Omega-3s are referred to be "essential fats" since the human body is unable to create them, thus you must consume them in your diet. At least two servings of fish per week are advised by the American Heart Association (AHA), especially oily fish because it is high in omega-3 fatty acids (1Trusted Source). There are many types of omega-3 fats, which differ based on their chemical shape and size. A low intake of omega-3 fatty acids compared with omega-6s may contribute to inflammation and chronic diseases, such as rheumatoid arthritis, diabetes, atherosclerosis, and heart failure.