Omega-3, omega-6 and omega-9 fatty acids are all important dietary fats. Interestingly, each one has a number of health benefits for your body. Omega-3 fatty acids are polyunsaturated fats, a type of fat your body can't make. The term "polyunsaturated" refers to their chemical structure, as "poly" means many and "unsaturated" refers to double bonds. Together they mean that omega-3 fatty acids have many double bonds. Like omega-3 fatty acids, omega-6 fatty acids are polyunsaturated fatty acids. The only difference is that the last double bond is six carbons from the omega end of the fatty acid molecule. Omega-6 fatty acids are also essential, so you need to obtain them from your diet. .