Vital Years Weekly #11: Omega-3s — The Most Underrated Supplement for Aging
Omega-3 fatty acids have more high-quality research behind them than almost any other supplement. After 55, the case for adequate intake becomes even more compelling.
Vital Years
Weekly Health Intelligence for Adults 55+
Your weekly digest — March 18–24, 2026 · Edition #11
Dear Health-Conscious Friends 55+,
Of the thousands of supplements on the market, very few have a body of evidence comparable to omega-3 fatty acids. Hundreds of randomised controlled trials, dozens of large prospective cohorts, and decades of mechanistic research consistently point in the same direction: EPA and DHA — the long-chain omega-3s found in fatty fish — are essential for cardiovascular health, brain function, joint health, and inflammatory regulation.
Most adults over 55 aren't getting nearly enough.
EPA vs DHA — Why Both Matter
EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are chemically distinct and have different primary functions. EPA is more potent for reducing systemic inflammation and lowering triglycerides. DHA is the structural fat that makes up 30–40% of the fatty acids in the brain and retina — it's literally the building material of your neural tissue. Both are found together in fatty fish, and most high-quality supplements contain both.
ALA — the omega-3 found in flaxseed, walnuts, and chia seeds — is often conflated with EPA and DHA, but the conversion rate from ALA to EPA in the human body is roughly 5–10%, and to DHA even lower. Plant-based omega-3 sources are healthy for other reasons, but they don't reliably substitute for EPA and DHA.
Three Insights From This Week
1. The REDUCE-IT Trial Changed Cardiac Prescribing
The 2018 REDUCE-IT trial tested high-dose EPA (4 grams/day of icosapentaenoic acid as Vascepa) in adults with elevated triglycerides already on statins. The result: a 25% reduction in cardiovascular events including heart attack and stroke. This was a landmark finding — large enough that high-dose EPA is now an FDA-approved cardiovascular treatment. For adults with triglycerides above 150 mg/dL, discussing prescription EPA with your cardiologist is now evidence-based medicine.
2. Omega-3s and Brain Aging — The MIDAS Trial
The MIDAS trial randomised 485 healthy older adults with self-reported memory concerns to either 900 mg of DHA daily or placebo for 24 weeks. The DHA group showed significantly better learning and memory scores — with the effect most pronounced in those who started with the lowest DHA blood levels. Follow your brain just as you follow your heart: your DHA blood level (tested as the omega-3 index) is a meaningful marker of brain health risk.
3. Fish Oil Quality Varies Enormously
Fish oil oxidises easily, and rancid fish oil may negate its benefits and potentially cause harm. Signs of poor quality: a fishy smell when you open the bottle, fishy burps after taking it, or capsules that break and taste strongly of fish. Key quality markers: look for third-party testing certification (IFOS, NSF, USP), check that the label lists specific EPA and DHA content (not just "fish oil"), and store in the refrigerator after opening. Enteric-coated capsules reduce burping and improve absorption.
Dose and Form
For general health maintenance, 1–2 grams combined EPA+DHA daily is a reasonable target — achievable either through two weekly servings of fatty fish plus supplementation, or through 2–3 standard fish oil capsules daily. For those with elevated cardiovascular risk or elevated triglycerides, higher doses (2–4 grams) are often appropriate under physician guidance. Algae-based omega-3 supplements are a high-quality, sustainable, fish-free option with equivalent bioavailability.
This Week's Action Step
Check your current fish oil supplement (if you take one) for the specific EPA and DHA milligrams per serving. Many popular brands list 1,000 mg of fish oil but contain only 300 mg combined EPA+DHA. You may be taking a third of what you think you are.
Next week: cortisol and stress — how chronic psychological stress accelerates biological aging at the cellular level, and the three interventions with the strongest evidence for cortisol regulation in older adults.
To your vital years,
The Vital Years Team