Is Omega-3 Index useful for longevity?

The Omega-3 Index measures the percentage of EPA and DHA in red blood cell membranes and is considered a marker of cardiovascular health. A higher index is associated with lower inflammation and reduced risk of cardiovascular disease – both factors that can influence lifespan. However, the direct link to longevity is not firmly established. Most evidence comes from observational studies showing associations, not causation. Randomized controlled trials of omega-3 supplementation have yielded mixed results, especially in healthy populations without deficiency. Moreover, the index is strongly influenced by diet and is not genetically fixed. While it can be a useful biomarker for overall health, it should not be viewed as a standalone predictor of longevity. A comprehensive longevity assessment should include other biomarkers (e.g., HbA1c, vitamin D, inflammatory markers) and lifestyle factors. Caveat: The Omega-3 Index is not a direct measure of life expectancy.