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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.
Top 10 Foods Highest in Omega 3 Fatty Acids. Omega 3 fatty acids are polyunsaturated fats with numerous health benefits, particularly regarding cardiovascular health. Alpha-linolenic acid (ALA) is a type of Omega 3 fat found in plant foods which cannot be manufactured by the human body. Once consumed, ALAs can be converted into eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).