Understanding your Omega-6:3 ratio (and why it matters)

If you've spent any time looking at Omega-3 supplements, you've probably seen the number "3:1" thrown around as a target. Here's what it actually means, and why it's worth paying attention to.

Your body needs both Omega-6 and Omega-3 fatty acids — neither is "bad." The issue is proportion. Modern diets, heavy in seed oils and processed food, tend to supply far more Omega-6 than Omega-3. Research analysing over half a million blood tests found the average ratio sits around 12:1 in Northern Europe, 15:1 across Europe more broadly, and as high as 25:1 in the United States. The traditional target, closer to what a Mediterranean or coastal diet would naturally provide, is closer to 3:1.

Why does the ratio matter more than the raw amount of either fat? Because Omega-6 and Omega-3 compete for the same enzymes in your body. When Omega-6 dominates, it can crowd out the metabolic pathways your body would otherwise use for Omega-3 — even if you're technically eating "enough" fish.

What a better ratio is associated with

• Normal brain and heart function, both of which rely on adequate DHA
• Healthy blood lipid levels, supported by protecting Omega-3s from oxidative stress
• Normal blood pressure and triglyceride levels within an already healthy range

How to actually find out where you stand

Most people have never had their Omega-6:3 ratio measured — it isn't part of a standard blood panel. A simple dried blood spot test (a small finger-prick sample you can do at home) can tell you your exact ratio, rather than leaving it to guesswork based on how much fish you think you eat.

From there, closing the gap is mostly about consistency: a daily Omega-3 supplement that also carries protective polyphenols (which help stop the Omega-3s oxidising before your body can use them), taken for around 120 days, is enough for most people to bring their ratio down into a healthy range.