The Science Made Simple: What Are Omega 3 and Omega 6?

What Are Omega 3 and Omega 6?

Both omega 3 and omega 6 are essential fatty acids. Your body cannot produce them, so you must get them from food (Bolt Pharmacy, 2026a). They play vital roles in cell structure, brain function, and how your body regulates inflammation.

Key forms to know:

• Omega 3 — Alpha linolenic acid (ALA) — Plant sources (flaxseed, walnuts, rapeseed oil)
• Omega 3 — EPA and DHA — Oily fish (salmon, mackerel, sardines)
• Omega 6 — Linoleic acid (LA) — Vegetable oils (sunflower, corn, soybean), nuts

The longer chain forms, EPA and DHA from fish, are the ones that have the most researched health benefits (National Institutes of Health, 2025).

The Competition That Matters

Here is the crucial bit: omega 3 and omega 6 compete for the same enzymes in your body (Nature, 2025). They use the same processing machinery. When you consume too much omega 6, it can effectively "crowd out" omega 3 from the system (Mariamenatu and Abdu, 2021).

This matters because the two families produce opposing effects:

• Omega 6 derivatives generally promote inflammation, blood clotting, and vasoconstriction (National Institutes of Health, 2012)
• Omega 3 derivatives generally reduce inflammation and promote healing (Broad Institute, 2024)

What Does "Ratio" Mean?

The ratio simply refers to how much omega 6 you have compared to omega 3.

• Ancestral diets: Estimated ratio of 1:1 to 4:1 (omega 6 to omega 3)
• Modern UK and Western diets: Ratio of 10:1 to 20:1 (Mariamenatu and Abdu, 2021)
• Some studies suggest even higher: 20:1 to 50:1 in some populations (Bolt Pharmacy, 2026b)

The Hidden Link to Inflammation

What the Research Shows

There is a strong link between a high omega 6 to 3 ratio and chronic inflammation, the kind that silently contributes to heart disease, obesity, inflammatory bowel conditions, rheumatoid arthritis, and even Alzheimer's disease (National Institutes of Health, 2025).

Key finding from recent UK research: A 2025 study using data from the Avon Longitudinal Study of Parents and Children and UK Biobank found a positive association between the omega 6 to omega 3 ratio and inflammatory markers in the body (Nature, 2025). In plain English, the higher the ratio, the more inflammation.

Another study published in the journal Brain, Behavior, and Immunity found that a high omega 6 to 3 ratio in the diet was associated with increased inflammation in the brain and impaired behaviour in animal models (Broad Institute, 2024).

How The Inflammation Happens

The inflammatory process works like this:

1. Omega 6 is metabolised into compounds called eicosanoids, specifically prostaglandins and leukotrienes that promote inflammation (National Institutes of Health, 2012)
2. Omega 3 is metabolised into specialised pro resolving mediators like resolvins and protectins, which actively resolve and shut down inflammation (Broad Institute, 2024)
3. When omega 6 dominates, your body produces more pro inflammatory signals and fewer anti inflammatory ones

This imbalance is not about omega 6 being "bad." It is about relative amounts. You need both. You just need them in the right proportions.

The UK Picture: Where We Are Now

Most UK Diets Are Out of Balance

According to the National Diet and Nutrition Survey, many UK adults consume insufficient oily fish, the primary source of EPA and DHA (Bolt Pharmacy, 2026c). Meanwhile, omega 6 from vegetable oils is abundant in the typical UK diet. Sunflower, corn, and soybean oils are used widely in cooking and food manufacturing, providing a constant supply of linoleic acid (Bolt Pharmacy, 2026a).

What UK Experts Say

The NHS recommendation is simple: Eat at least two portions of fish per week, including one portion of oily fish (approximately 140g) (NHS, 2024). This provides around 450mg of EPA and DHA per day.

The Scientific Advisory Committee on Nutrition (SACN) recommends:

• Long chain omega 3 (EPA and DHA): at least 450mg daily (UK Parliament, 2024)
• Omega 6: a population goal of about 6.5% of total food energy (UK Parliament, 2024)

Critically, UK guidance focuses on absolute omega 3 intake rather than a specific ratio. The emphasis is on getting enough omega 3, not on worrying about omega 6 numbers (Bolt Pharmacy, 2026b).

What This Means For You

The Good News

You do not need to obsess over numbers or avoid omega 6 entirely. In fact, linoleic acid (the main omega 6) appears to have neutral or even beneficial effects on cardiovascular risk when it replaces saturated fats (National Institutes of Health, 2012).

The goal is not elimination. It is rebalancing.

Practical Steps to Improve Your Ratio

1. Eat oily fish weekly — Salmon, mackerel, sardines, herring, fresh tuna (not tinned). One 140g portion a week is the NHS target (NHS, 2024). Pregnant women should limit oily fish to two portions weekly (NHS, 2024).
2. Use better cooking oils — Switch from sunflower and corn oil to rapeseed oil, which has a more favourable omega 3 to 6 ratio (Bolt Pharmacy, 2026b). Use olive oil for dressings and low heat cooking.
3. Add plant based omega 3 sources — Ground flaxseeds (linseeds) on porridge or in smoothies, walnuts as a snack, chia seeds in puddings or yoghurts (Bolt Pharmacy, 2026c).
4. Be aware of processed foods — Many convenience foods contain omega 6 rich oils. Choosing whole foods over processed ones naturally improves your ratio.
5. Consider supplements if needed — If you do not eat fish, algae based supplements provide DHA (and sometimes EPA) (Bolt Pharmacy, 2026c). NICE does not recommend routine omega 3 supplements for cardiovascular prevention in the general population (NICE, 2022). If you are on blood thinning medication (anticoagulants), consult your GP before supplementing (NHS, 2024).

The Bottom Line

Your omega 3 to 6 balance is a hidden inflammation marker because it influences the inflammatory signals your body produces. A high ratio (too much omega 6, too little omega 3) tips your system toward chronic inflammation, the kind that quietly contributes to long term health issues.

The fix is straightforward:

• Eat oily fish weekly
• Choose better cooking oils
• Add plant based omega 3s
• Eat more whole foods

UK guidance emphasises getting enough omega 3 rather than stressing about exact numbers. As one authoritative source puts it: "UK guidance focuses on adequate absolute omega 3 intake rather than specific omega 6 to omega 3 ratios" (Bolt Pharmacy, 2026b).

Disclaimer

This content is for educational and informational purposes only. It is not medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional with any questions about your health, especially before starting supplements or making significant dietary changes. Individual responses to dietary changes vary.