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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.
Omega-6 fatty acids are also polyunsaturated and some studies have shown that including omega-6s in your diet can help to reduce your risk of cardiovascular disease. Omega-3 fatty acids are found in some cold-water fatty seafood, flaxseed oil, canola oil and walnuts. Foods that Contain Polyunsaturated Fat. All foods with fats in them contain varying amounts of polyunsaturated, monounsaturated and saturated fats. Some of the more beneficial types of fats are Polyunsaturated Fats (PUFAs).