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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.
1 The more omega 3 fatty acids blocking the COX 1 enzyme, the fewer omega 6 fatty acids will be converted to prostaglandins. 2  Foods rich in omega-3 fatty acids include: sardines, salmon, soybeans, flax seeds, walnuts, tofu and mackerel. The more omega 3 fatty acids blocking the COX 1 enzyme, the fewer omega 6 fatty acids will be converted to prostaglandins. 2  Foods rich in omega-3 fatty acids include: sardines, salmon, soybeans, flax seeds, walnuts, tofu and mackerel.