#068 Dr. Bill Harris on the Omega-3 Index: Increasing Omega-3 to Promote Longevity & Transform Health

Dr. Harris began studying omega-3s in the late 1970s as part of a postdoc project to investigate how fish oil, an animal fat that is liquid at room temperature, affected cholesterol levels, leading to the unexpected discovery of its triglyceride-lowering effects.

No, plant-based ALA is not nearly as potent as marine EPA and DHA for cardioprotective benefits. While ALA can convert to EPA and DHA, the conversion rate is very low (around 2-5%), making direct consumption of marine sources or algal oil more effective.

The Omega-3 Index measures EPA and DHA in red blood cell membranes, providing a stable, long-term reflection of omega-3 status. Unlike plasma levels, which can fluctuate daily with meals, the red blood cell measure is more consistent, similar to how hemoglobin A1C reflects long-term glucose control.

The recommended target Omega-3 Index level is above 8%. Studies have shown that individuals with an index over 7-8% have significantly lower risks for various adverse health outcomes, including all-cause mortality.

Studies, including one from the Framingham cohort, suggest that individuals with the highest Omega-3 Index levels (e.g., over 7%) may live approximately five years longer than those with the lowest levels (e.g., under 4%).

Yes, omega-3s, particularly EPA and DHA, are known to reduce and resolve inflammation. They are metabolized into specialized pro-resolving mediators (SPMs) that actively suppress inflammatory responses and prevent them from becoming chronic.

A pilot study found that COVID-19 patients with the highest quartile of omega-3 levels were half as likely to die compared to those with lower levels. Additionally, in silico experiments suggest DHA may help keep the SARS-CoV-2 spike protein in a closed position, preventing it from entering cells.

The omega-6 to omega-3 ratio is considered imprecise and potentially misleading. While a high ratio can be 'fixed' by increasing omega-3 intake, simply lowering omega-6 intake without increasing omega-3 does not necessarily improve health, and some omega-6 fatty acids like linoleic acid are associated with lower cardiovascular and diabetes risk.

No, concerns linking omega-3s to prostate cancer stem from a single, highly criticized 2013 study that found a very small, statistically significant correlation in a confounded cohort. This finding has not been confirmed and has been refuted by other studies showing omega-3s to be protective against prostate cancer.

Some high-dose omega-3 trials (e.g., 4 grams/day) have shown a small, statistically significant increase in Afib risk in individuals with pre-existing heart conditions. However, lower doses (e.g., 800mg) have not shown this risk, and observational studies suggest higher baseline omega-3 levels may be associated with a lower risk of Afib.

Omega-3s, particularly DHA, increase the flexibility of red blood cell membranes. This enhanced flexibility allows red blood cells to more efficiently squeeze through capillaries and potentially deliver more oxygen to tissues, which may be a protective mechanism against various adverse outcomes.

Omega-3 supplementation during pregnancy, particularly DHA, has been shown to reduce the risk of premature birth, especially early premature birth (before 34 weeks). Maintaining a red blood cell DHA level over 5% is suggested as a target for pregnant women to potentially reduce this risk and support fetal brain development.