Omega-3 fatty acids are among the essential long-chain polyunsaturated fatty acids,
without which the human body is not viable. They must be taken in with food because, unlike saturated fatty acids, our body cannot produce them itself.
The most important omega-3 fatty acids, found mainly in oily fish, are eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA) and docosahexaenoic acid (DHA). Omega-3 fatty acids are found in plant and marine sources.