Of all the nutrients the body needs, a small group of fats stands out for being genuinely essential - meaning the body cannot manufacture them and must obtain them from food. These are the essential fatty acids, and the balance between the two families, omega-3 and omega-6, is one of the most discussed topics in modern nutrition. This guide explains what essential fatty acids are, why their balance matters, and how to meet your needs from whole foods.
The information in this article is educational and is not a substitute for professional medical or dietary advice.
What Makes a Fatty Acid “Essential”?
The body is a remarkable chemist, capable of making most of the fats it needs. But there are two fatty acids it cannot build from scratch: alpha-linolenic acid (ALA), the parent omega-3, and linoleic acid (LA), the parent omega-6. Because they must come from the diet, these two are termed essential fatty acids (EFAs). From them, the body can make a family of longer-chain fatty acids that serve as building blocks for cell membranes and as precursors to the signalling molecules that help regulate inflammation, circulation and much else besides.
The Two Families: Omega-3 and Omega-6
Both omega-3 and omega-6 fatty acids are necessary, and both have important roles. The key longer-chain members are:
- Omega-3: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), made in limited amounts from ALA or obtained directly from oily fish.
- Omega-6: arachidonic acid, made from linoleic acid found in many seeds, nuts and vegetable oils.
These families are not rivals so much as partners that need to be kept in proportion - which is where the modern diet often runs into trouble.
Why the Omega Balance Matters
For most of human history, diets supplied omega-3 and omega-6 in a relatively balanced ratio. Modern eating patterns, rich in refined vegetable and seed oils and processed foods, have shifted that balance heavily towards omega-6. Research suggests that restoring a better balance - chiefly by increasing omega-3 intake and moderating processed sources of omega-6 - may support the body’s healthy inflammatory balance. The naturopathic emphasis, as ever, is less on chasing a precise number and more on the quality of the whole diet.
Omega-3: Sources and the Conversion Question
There are two practical routes to meeting omega-3 needs:
- Plant sources of ALA - flaxseed (and flaxseed oil), chia seeds, walnuts and hemp seeds. ALA contributes to the maintenance of normal blood cholesterol levels.
- Marine sources of EPA and DHA - oily fish such as salmon, mackerel, sardines and herring. DHA contributes to the maintenance of normal brain function and normal vision, while EPA and DHA together contribute to the normal function of the heart.
There is an important subtlety here: the body’s conversion of plant-based ALA into the longer-chain EPA and DHA is limited and varies from person to person. This is why those who eat little or no fish - including many following a plant-based diet - often pay particular attention to generous, regular sources of ALA, and may consider an algae-derived DHA source, which provides these omega-3s directly from a plant origin.
Omega-6: Not the Villain, but Balance Matters
Omega-6 fatty acids are essential and play genuine roles in the body, so the goal is not to eliminate them. The issue is one of proportion and quality. Much of the modern oversupply comes from refined oils and the processed foods made with them, rather than from whole foods. Obtaining omega-6 from its natural packages - nuts, seeds and wholegrains - while reducing reliance on refined oils, is a sensible way to keep the families in better balance.
Whole Foods Versus Supplements
Fish-oil and other EFA supplements are widely available, and there is a place for them in particular circumstances. But the naturopathic starting point is always real food. A diet that regularly includes oily fish (or quality plant omega-3 sources), nuts, seeds and a foundation of whole, unprocessed foods supplies essential fatty acids within the rich matrix of nutrients that naturally accompanies them - something no isolated capsule can fully reproduce. Whole foods first, supplements where genuinely indicated, is a reliable principle.
Key Takeaways
- Essential fatty acids (omega-3 ALA and omega-6 linoleic acid) cannot be made by the body and must come from food.
- Both families matter; health lies in their balance, which modern diets tend to skew towards omega-6.
- Omega-3 comes from flax, chia, walnuts and hemp (ALA) and from oily fish (EPA and DHA); conversion of ALA to EPA/DHA is limited.
- Omega-6 is essential too - favour whole sources (nuts, seeds, wholegrains) over refined oils.
- Aim for whole foods first, using supplements only where genuinely indicated.
Getting to grips with fats is one of the most empowering steps in understanding nutrition, dispelling years of confusing and contradictory advice.
The role of fats in the body - from cell membranes to the regulation of inflammation - is explored in depth across our courses. The Certificate in Nutrition & Health is an ideal place to build these foundations, while the Professional Diploma in Nutritional Therapy takes them to practitioner level.
References
- Simopoulos, A.P., ‘The importance of the omega-6/omega-3 fatty acid ratio’, Biomedicine & Pharmacotherapy (2002)
- European Food Safety Authority, Scientific Opinions on health claims (ALA, DHA, EPA)
- Murray, M. & Pizzorno, J., Encyclopaedia of Natural Medicine, Simon & Schuster (2012)