What types of essential fatty acids are there?

Fish and fish oil supplements are Excellent sources of omega-3 fatty acids (an essential fatty acid).

Walnuts, almonds, flax seed, soybeans (tofu), and dark leafy green vegetables have alpha-linolenic acid (ALA) which can be converted into omega-3, however, the amount that is converted into omega-3 is very little.

Getting omega-3 from either eating fish or taking fish oil supplements seems to be the most effective way.