Processing strips omega-3 from some foods and traps it in others. Oils cold-pressed or extracted without heat hold more than those refined at high temperature. Fish oil supplements and fortified spreads concentrate what raw sources provide thinly. The figures below show what ends up in your finished product.
Oily fish (mackerel, sardines, anchovies) dominate the ranking because their tissues store omega-3 as fuel for movement. Walnuts, flaxseeds, and canola oil carry it too, but in a form your body converts less readily. This ranking cannot tell you whether the omega-3 you eat will stay stable from factory shelf to your customer's kitchen.
Plant oils and seeds contain alpha-linolenic acid, the omega-3 form you can make from plants. Your body converts it slowly into the longer-chain types that oily fish provide ready-made. Fortified plant products and algae supplements offer another route. Without them, vegetarian and vegan diets stay lower in the forms that accumulate fastest in human tissue.
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