Omega-3 Fatty Acids: Benefits For Heart Health
Omega-3 fatty acids are a family of fats found in fish, seafood, nuts, seeds and some plant oils. They form part of a balanced diet and are involved in normal cell function throughout the body.
This is general educational information, not medical advice. Never stop, reduce, or change any medication without speaking to your doctor first.
Omega-3-rich foods and dietary supplements are not substitutes for statins or any other prescribed treatment. If you have a heart condition, high cholesterol, high triglycerides or another health concern, follow the plan agreed with your healthcare team.
What are omega-3 fatty acids?
The omega-3 fats discussed most often are ALA, EPA and DHA. ALA is found mainly in foods such as flaxseed, chia seeds, walnuts and rapeseed oil. EPA and DHA are found mainly in fish and seafood, with algae providing a non-fish source.
ALA is an essential fatty acid, which means the body cannot make it and it must come from food. The body can convert a small amount of ALA into EPA and DHA, but this conversion is limited. A varied diet can therefore provide omega-3s from different sources.
Omega-3s and heart health
Oily fish is a source of long-chain omega-3 fats. The NHS includes fish as part of a healthy, balanced diet and notes that oily fish can help support heart health. Fish also provides protein and several vitamins and minerals, so its value is not limited to omega-3 alone.
Research has examined omega-3s in relation to blood fats, blood pressure, blood-vessel function and cardiovascular outcomes. Results are not identical across all populations or products. Evidence about a food pattern cannot automatically be applied to a concentrated supplement.
Food sources of omega-3
Oily fish
Examples include salmon, sardines, mackerel, herring, trout and pilchards. UK guidance recommends eating at least two portions of fish a week, including one portion of oily fish. Advice can differ during pregnancy and for some groups, so check current NHS guidance if those considerations apply to you.
Plant and algae sources
- Ground flaxseed or linseed
- Chia seeds
- Walnuts and hemp seeds
- Rapeseed oil
- Soya beans and soya oil
- Algae-derived foods and products
Plant foods can also contribute fibre, protein and other unsaturated fats. Product composition varies, so read labels carefully rather than assuming every product provides the same type or amount of omega-3.
What about omega-3 supplements?
Fish oil, krill oil, algal oil and flaxseed oil products are not interchangeable. Speak to a doctor or pharmacist before starting an omega-3 supplement, particularly if you take medication, have a diagnosed condition, are preparing for surgery, are pregnant or breastfeeding, or have experienced a reaction to fish or seafood.
The wider heart-health picture
A heart-supportive lifestyle is broader than one nutrient. Helpful foundations include a varied diet, suitable physical activity, avoiding smoking, regular sleep and recommended health checks. Take prescribed medication as directed and discuss concerns with a clinician rather than changing treatment yourself.
Reliable further information
This article is for general education only and is not a diagnosis, treatment recommendation or substitute for individual medical advice.
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