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The highest concentrations of omega-3 fatty acids are found in coldwater fish, such as sardines, salmon, herring, tuna, cod, mackerel, halibut, and shark. These fatty acids are also found in lower concentrations in plant foods such as flaxseed, walnuts, Great Northern beans, kidney beans, navy beans, and soybeans.
EPA and DHA are found in a variety of foods but mostly in fatty fish. Good sources of Omega 6 polyunsaturated fats include corn oil, safflower oil, sunflower oil, soybean oil, and olive oil. Sources of Omega 3 polyunsaturated fats include fatty fish, flaxseed oil, walnuts, and soybean oil.