Humans evolved on diets consisting of marine life and/or inland plants which provided abundant omega-3 fats. This resulted in an omega-6/omega-3 ratio that was around 1:1.
Currently, humans don’t get nearly enough omega-3 fats from things like flax, hemp, walnut, perilla, salba, and fish oil. As a result, most people consume a ratio of about 16:1 – an intake that’s out of balance.
Therefore, purposefully adding omega-3 rich fats has become not only popular, but necessary. And the two most popular omega 3 foods are flax seeds and fish oil.