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Omega-3 Fatty Acids Explained

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EPA, DHA, and ALA: types and roles

Omega-3 fatty acids are broadly split into EPA, DHA, and ALA. EPA is involved in blood vessel and inflammatory response regulation, DHA is a major structural fat in the brain and retina and supports cognitive function, and plant-based ALA is partially converted into EPA and DHA in the body.

Why you need to eat them (essential fatty acid)

Omega-3s are essential fatty acids the body cannot synthesize on its own, so they must come from food or supplements. They are continuously needed for cell membrane structure and various physiological regulatory functions.

Top food sources

Oily fish like mackerel, salmon, and Spanish mackerel are rich in EPA and DHA, while walnuts, flaxseed oil, and perilla oil are rich in the plant-based omega-3, ALA.

ALA's low conversion rate

Plant-based ALA is converted to EPA and DHA through enzymatic processes in the body, but the conversion rate is low β€” roughly 5–10% β€” so on plant-heavy diets, directly eating oily fish or considering algae-based DHA supplements can help.

Balancing omega-3 and omega-6

Omega-6 is also an essential fatty acid, but modern diets β€” via cooking oils and processed foods β€” often already provide it in excess, so keeping an appropriate ratio of omega-3 relative to omega-6 is considered important for inflammatory balance.

Cardiovascular research evidence

Multiple studies have found that omega-3s lower triglyceride levels and inhibit blood clot formation, which is a major reason oily fish is widely recommended for cardiovascular health.

Why bother getting enough omega-3?

Omega-3 is an essential fatty acid the body cannot make on its own, and it plays a wide role from cell membrane structure to cardiovascular health. People who eat little fish can easily fall short, so it helps to know the food sources and how to get enough.

A note on this information

This page summarizes general nutrition knowledge and is not a substitute for professional medical diagnosis or individualized dietary counseling. If you have a condition such as taking blood thinners, consult a doctor.

Frequently Asked Questions

Is it hard to get enough omega-3 on a vegetarian diet?

Plant-based ALA can be obtained from flaxseed oil, perilla oil, and walnuts, but the conversion rate to EPA/DHA in the body is low, so vegetarians sometimes consider algae-based DHA supplements as well.

Are omega-3 supplements safe for everyone?

They are generally considered safe, but high doses can delay blood clotting, so anyone taking blood thinners or scheduled for surgery should consult a doctor before deciding whether to take them.