Omega-3 and omega-6 fatty acids are both essential polyunsaturated fats: your body cannot produce them and must obtain them through diet. They have fundamental but often opposing biological roles: omega-6 tends to promote inflammation (necessary for fighting infections and healing injuries), while omega-3 tends to reduce it. In a balanced diet, these actions counterbalance each other. In a modern Western diet, this balance is severely disrupted.

The omega-6 to omega-3 ratio: the core problem

Our Paleolithic ancestors consumed omega-6 and omega-3 in a ratio of roughly 1:1 to 4:1. The modern Western diet has a ratio of 15:1 to 20:1 in favor of omega-6. This shift occurred over the last 100 years with the introduction of omega-6-rich vegetable oils (sunflower, corn, soy, cottonseed) as primary dietary fats, and the decline in consumption of fatty fish and game.

The consequences of this imbalance: a chronic low-grade inflammatory state that research links to cardiovascular disease, obesity, type 2 diabetes, depression, cognitive decline, and autoimmune diseases. It's not that omega-6 is "bad"—it's essential. It's the imbalanced ratio that creates a systemic pro-inflammatory environment.

Omega-3: the three main forms and their sources

ALA (alpha-linolenic acid): the plant-based form, found in flaxseeds, chia seeds, walnuts, hemp oil, and flaxseed oil. Your body can convert ALA to EPA and DHA, but with very low efficiency: only 5-15% of ALA converts to EPA, and less than 1% to DHA. Plant-based omega-3 sources are therefore less effective than marine sources for obtaining EPA and DHA. EPA (eicosapentaenoic acid): found in fatty fish (sardines, mackerel, salmon, anchovies, herring) and marine algae. It has direct anti-inflammatory effects and cardiovascular protection. DHA (docosahexaenoic acid): found in fatty fish and marine algae. It's a fundamental structural component of the brain (60% of the brain is fat, with DHA being the primary component), the retina, and cell membranes. Essential for fetal and infant neurological development.

Fatty fish: the most efficient source of omega-3

Sardines are the omega-3 source par excellence in terms of quality-to-price-to-sustainability ratio: a 100g serving of fresh sardines contains roughly 2-3g of EPA+DHA, costs just a few euros, is an abundant species in the Mediterranean, and has low mercury levels. Mackerel has similar content. Salmon (wild or ASC-certified) contains 2-3g of EPA+DHA per 100g. Anchovies are excellent for omega-3 and versatile (fresh, marinated, or as anchovy paste).

Plant-based sources: useful but limited

Ground flaxseeds (not whole—the hull makes them indigestible if left intact) are the richest plant-based source of ALA: 2.3g per tablespoon. Chia seeds: 2.5g of ALA per tablespoon. Walnuts: 2.5g of ALA per 30g. Flaxseed oil: 7.3g of ALA per tablespoon (use only raw, never cook it).

These sources are useful and important in vegetarian and vegan diets, but they don't replace fish for EPA and DHA. For vegans who don't eat fish: marine algae-based DHA and EPA supplements (the original source of these fats, which fish obtain by eating algae) are the solution recommended by EFSA and nutritionists.

How to reduce excess omega-6

Don't eliminate omega-6 (it's essential): reduce the excess from industrial sources. Replace regular sunflower oil (65-70% omega-6) with extra virgin olive oil (low in omega-6, high in neutral omega-9 monounsaturated fat) or high-oleic sunflower oil (much lower in omega-6). Cut back on industrial fried foods cooked in soy, corn, and sunflower oils. Choose meat from pasture-raised animals (lower in omega-6 and higher in omega-3 compared to factory farming). Increase fatty fish to 2-3 times per week.

The practical plan to rebalance your omegas

Increase: fatty fish 2-3 times per week (sardines, mackerel, salmon, anchovies), ground flaxseeds or chia seeds in your morning cereal (1-2 tablespoons daily), walnuts as a daily snack (30g), extra virgin olive oil as your main dressing. Reduce: sunflower, corn, and soy oils as primary dressings (replace them with EVO), industrial fried foods cooked in these oils (snacks, fast food, packaged fried products), excessive consumption of meat from factory farming (high in omega-6).

Ground flaxseeds: the easiest way

One tablespoon of ground flaxseeds (grind in a coffee grinder or buy pre-ground and store in the fridge) added to yogurt, porridge, or a smoothie each morning provides about 2.3g of ALA. It doesn't replace fish but contributes to omega balance. Whole seeds pass through undigested: always grind before use or buy pre-ground "golden flaxseed meal." Store in the refrigerator after opening: polyunsaturated fats oxidize quickly.

For vegans: DHA and EPA supplementation from algae

Marine algae are the original source of EPA and DHA that fish obtain from eating them. Algae oil supplements (available as capsules or liquids) provide EPA and DHA directly, without needing to eat fish. Recommended dose: 250-500mg of DHA+EPA daily. It's the most effective solution for vegans who want to maintain optimal omega-3 levels without consuming animal products.

Blood test for omega-3

The "Omega-3 index" is a blood test that measures the percentage of EPA+DHA in red blood cells. A value above 8% is associated with minimal cardiovascular risk. Below 4% is associated with elevated risk. Most residents in Western countries have an index around 4-5%. This test, available at many labs, gives you a concrete measure of your actual omega-3 status. If the result is low, you know exactly what to do: more fatty fish, more flaxseeds, or supplementation if needed.