American Heart Association Recommendation

Omega-3 fatty acids benefit the heart of healthy people, and those at high risk of — or who have — cardiovascular disease.

We recommend eating fish (particularly fatty fish) at least two times a week.  Fish is a good source of protein and doesn’t have the high saturated fat that fatty meat products do.  Fatty fish like mackerel, lake trout, herring, sardines, albacore tuna and salmon are high in two kinds of omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).

To learn about omega-3 levels for different types of fish — as well as mercury levels, which can be a concern — see our Encyclopedia entry on Fish, Levels of Mercury and Omega-3 Fatty Acids.

We also recommend eating tofu and other forms of soybeans, canola, walnut and flaxseed, and their oils. These contain alpha-linolenic acid (LNA),  which can become omega-3 fatty acid in the body. The extent of this modification is modest and controversial, however. More studies are needed to show a cause-and-effect relationship between alpha-linolenic acid and heart disease.

source: www.americanheart.org/presenter.jhtml?identifier=4632