Not all unsaturated fatty acids are essential. Unfortunately, many of the popular oils used today are nonessential fats and many are hydrogenated. Hydrogenation is a manufacturing process that converts unsaturated fats into saturated fats to prolong shelf life. Read the labels of foods you buy in the grocery store. Hydrogenated or partially hydrogenated vegetable oils are found in margarine, shortening, commercial baked goods and processed foods.
Hydrogenation physically alters any EFAs in the oil, which creates artificial fatty acids.
The other is omega-3. Flaxseeds are rich in omega-3 EFAs. Walnuts and soybeans also contain significant amounts as well as freshly ground wheat germ. Whole or ground up flaxseeds can be found in bulk at most health food stores. Certain fish are very rich in EFAs.