Omega-3 fatty acids — particularly the long-chain EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) found primarily in oily fish — are among the most evidence-supported nutrients for healthy ageing. Their anti-inflammatory properties, structural roles in cell membranes, and specific effects on brain, cardiovascular, and musculoskeletal health make them one of the highest-priority dietary targets for adults over 60. Understanding the evidence for omega-3s in ageing — and how to practically ensure adequate intake — is a meaningful investment in long-term health.
DHA and Brain Ageing
DHA constitutes 30–40% of the fatty acids in neuronal cell membranes — it is the primary structural fat of the brain. DHA levels in the brain decline with age, and lower blood DHA is consistently associated with greater cognitive decline and higher dementia risk in large prospective studies. The evidence for DHA supplementation preventing cognitive decline in already-healthy older adults is less definitive than observational associations suggest, but there is growing support for DHA's role in maintaining cognitive function. The MIDAS trial found that DHA supplementation improved memory performance in older adults with mild memory complaints. Two portions of oily fish weekly is the dietary recommendation from both the NHS and British Dietetic Association for cognitive protection.
EPA, DHA, and Cardiovascular Protection
The cardiovascular evidence for omega-3 fatty acids is the most robust in the field. EPA and DHA reduce triglycerides by 20–50% (dose-dependent), reduce platelet aggregation and thrombosis risk, reduce inflammatory markers, and have anti-arrhythmic effects. The British Heart Foundation recommends two portions of fish weekly including one of oily fish as a cardiovascular protective dietary practice. The REDUCE-IT trial demonstrated 25% reduction in major cardiovascular events with high-dose icosapentaenoic acid (a pharmaceutical EPA preparation) in high-risk patients — suggesting meaningful cardiovascular benefit from EPA specifically at higher intakes than dietary oily fish alone typically provides.
Omega-3s and Muscle Health in Ageing
A less widely known benefit of omega-3 fatty acids is their role in combating sarcopenia. EPA and DHA improve the anabolic response of muscle protein synthesis to both amino acids and exercise — they reduce muscle cell anabolic resistance, the primary mechanism of age-related muscle loss. Several RCTs have found that omega-3 supplementation improves muscle protein synthesis rates and reduces markers of muscle inflammation in older adults. This makes adequate omega-3 intake doubly relevant for older adults concerned about maintaining muscle mass and physical function. See our sarcopenia prevention guide.
Omega-3s and Joint Health
The anti-inflammatory properties of EPA and DHA directly reduce the prostaglandin-driven joint inflammation of arthritis. Multiple trials have found that fish oil supplementation reduces joint pain, morning stiffness, and the need for NSAIDs in rheumatoid arthritis. For osteoarthritis, the evidence is more modest but suggests reduced inflammatory markers with regular oily fish or supplementation. The British Dietetic Association rheumatoid arthritis dietary guidance specifically includes omega-3 fatty acids as an evidence-based nutritional intervention.
Meeting Omega-3 Requirements
Oily fish 2+ portions weekly (salmon, mackerel, sardines, herring, fresh tuna — canned tuna is processed and does not count as oily fish) is the primary dietary strategy. For those who cannot or do not eat oily fish, algal DHA/EPA supplements provide the same long-chain omega-3s from their original source (microalgae, where fish get their omega-3s). Standard fish oil supplements provide 300–1000mg combined EPA+DHA per capsule; for therapeutic effects (triglyceride reduction, anti-inflammatory), higher doses of 2–4g daily are used in clinical settings. The British Nutrition Foundation omega-3 guidance provides dietary source and supplementation information.
Supporting Healthy Ageing Through Daily Nutrition
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For related reading, see our cognitive decline prevention guide and our cardiovascular health after 60 guide.
Quality Food for London Offices
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Frequently asked questions
What is the difference between EPA and DHA in terms of function?
DHA is primarily a structural fat, making up 30-40% of neuronal cell membranes and playing a key role in brain architecture and synaptic transmission. EPA is more functionally active in reducing inflammation — it is the precursor to anti-inflammatory eicosanoids that reduce joint inflammation, platelet aggregation, and cardiovascular risk. Both are found in oily fish and algal supplements.
Does canned tuna count as an oily fish for omega-3 intake?
No. The canning process removes most of the omega-3 fat content from tuna, so canned tuna does not qualify as an oily fish serving for the purpose of NHS or British Dietetic Association recommendations. Fresh and frozen tuna retains its oil content and counts. Sardines, mackerel, salmon, and herring — whether fresh or canned in their own juices — all count as oily fish.
Can vegetarians and vegans meet their omega-3 needs without fish?
Yes, though it requires deliberate supplementation. Plant foods such as flaxseed, chia, and walnuts provide ALA (alpha-linolenic acid), but the conversion to EPA and DHA in the body is inefficient. Algal DHA and EPA supplements — derived from the microalgae that fish obtain their omega-3s from — provide the same long-chain fatty acids without fish, and are considered equivalent to fish oil for this purpose.
How long does it take for omega-3 supplementation to raise blood levels?
Blood EPA and DHA levels typically reach a new plateau within eight to twelve weeks of consistent daily supplementation. Tissue incorporation into cell membranes, including brain neuronal membranes, takes longer — some studies suggest three to six months of regular intake before structural tissue levels meaningfully shift. Consistency of intake matters considerably more than the timing of any individual dose.
Is there a risk of taking too much omega-3?
At dietary doses from food, there is no established upper limit concern. At high supplemental doses above 3-4g daily, EPA and DHA can have blood-thinning effects that may interact with anticoagulant medications such as warfarin. The European Food Safety Authority considers up to 5g daily from supplements to be safe for most adults, but anyone on anticoagulant therapy should discuss higher doses with their GP before supplementing.