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Different types of omega-3s
Key omega-3 fatty acids include eicosapentaenoic acid (EPA) and docosahexanoic acid (DHA), both found primarily in oily cold-water fish such as tuna, salmon, and mackerel. Aside from fresh seaweed, a staple of many cultures, plant foods rarely contain EPA or DHA.
However, a third omega-3, called alpha-linolenic acid (ALA), is found primarily in dark green leafy vegetables, flaxseed oils, and certain vegetable oils. Although ALA has different effects on the body than EPA and DHA do, the body has enzymes that can convert ALA to EPA. All three are important to human health.
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