What role does Omega-3 Index play in longevity?

The Omega-3 Index measures the percentage of EPA and DHA in red blood cell membranes and serves as a long-term marker of omega-3 status. A high index (>8%) is associated with reduced cardiovascular risk, which may indirectly support longevity. However, direct evidence for lifespan extension in humans is limited. Most data come from observational studies showing associations but not causation. Randomized controlled trials with hard endpoints like all-cause mortality show mixed results. The index is influenced by diet, supplementation, and genetic variants (e.g., FADS). Optimizing the Omega-3 Index alone, without addressing overall lifestyle, is not a proven anti-aging strategy. Caution: excessive omega-3 intake can increase bleeding risk and oxidative stress. The test is useful for personalized nutrition advice but not a guarantee of longevity. Evidence: human-moderate.