Your morning chia may hold more omega-3 than salmon. Your body only uses a fraction

A single ounce of chia seeds carries about 5,050 milligrams of omega-3, nearly three times what a 3-ounce serving of Atlantic salmon delivers. Two tablespoons of ground flaxseed provide roughly 4,700 milligrams. An ounce of walnuts, about seven halves, contributes another 2,570 milligrams. Salmon lands well below that on the raw number.

The catch is what the body does after you swallow it. Plant foods deliver only alpha-linolenic acid, or ALA. The active omega-3s used in the brain, eyes and cardiovascular system are EPA and DHA, and humans convert ALA into them slowly. According to the International Food Information Council, ALA "can be converted into EPA and further into DHA in the liver, although this process is inefficient."

What the conversion actually looks like

Human trials have put numbers on that inefficiency. Studies of healthy adults suggest men convert roughly 8 percent of dietary ALA to EPA and 0 to 4 percent to DHA, while women convert about 21 percent to EPA and up to 9 percent to DHA. The Harvard T.H. Chan School of Public Health notes on its Nutrition Source that EPA and DHA "can be made from" ALA, "but because the conversion from ALA to EPA/DHA may not be sufficiently efficient, EPA/DHA are best obtained directly from food sources."

Fish delivers EPA and DHA directly. A 3-ounce cooked serving of farmed Atlantic salmon supplies close to 1.8 grams of long-chain omega-3s in the form the body can use on the spot.

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Five plant foods that top salmon per serving

The raw ALA leaderboard, drawn from the IFIC food-sources table, looks like this.

For context, the adult adequate intake for ALA is 1.6 grams a day for men and 1.1 grams for women. A single tablespoon of ground flax or an ounce of chia clears that bar on its own. Regular chia eaters may also see downstream effects on blood pressure and gut health that go beyond the omega-3 number.

What a year-long trial just added

The clearest recent data on how far plant ALA actually travels in the body comes from a 12-month study of adults on Western, flexitarian, vegetarian and vegan diets, published in Frontiers in Nutrition in December 2025. Participants supplemented with flaxseed oil, and researchers tracked how the fatty acids showed up in red blood cells.

ALA in red blood cells rose by 22 to 38 percent. EPA climbed by 27 to 41 percent, DPA by a similar margin, and DHA by 13 to 26 percent. That is a bigger conversion signal than earlier work had suggested. But as News-Medical reported, vegans still "consistently exhibited the lowest absolute concentrations of EPA and DHA" compared with people who ate fish, even after a year of supplementation. The authors recommended pairing ALA-rich foods with algae-based EPA and DHA for people who avoid seafood.

The practical takeaway

Plant ALA foods are not a rounding error. They meet basic omega-3 needs easily, contribute fiber, protein and other nutrients, and can raise blood levels of long-chain omega-3s more than researchers used to think. What they do not do is fully replace fatty fish for people who are chasing EPA and DHA specifically, particularly for cardiovascular or brain benefits.

The current federal Dietary Guidelines still steer adults toward around 8 ounces of seafood a week for that reason. For readers who skip fish, an algae-derived EPA and DHA supplement is the direct workaround. Anyone weighing changes to their diet or supplement routine for a specific heart or brain concern should talk it through with a doctor first.

This article is made and published by Jesper Bengtson, who may have used AI in the preparation.