Despite being calorie-dense, the body genuinely needs a certain amount of fat to function well. What matters most is the type of fat – generally, unsaturated fats are the more beneficial choice, while saturated fats are best kept in moderation.
Omega fatty acids – omega 3, 6 and 9 – are among the "good" unsaturated fats. So what exactly are they, and why does the body need them?
A Quick Chemistry Lesson
To understand the difference between omega 3, 6 and 9, it helps to start with fatty acids themselves – the building blocks of fat, arranged in ways that form either saturated or unsaturated fats.
Fatty acids are made up of chains of carbon, oxygen and hydrogen atoms. Think of these atoms like beads on a necklace – the specific arrangement and bonding of these "beads" determines whether a fat is saturated or unsaturated, and further chemistry within that determines whether it becomes omega 3, 6 or 9.
Why the Difference Between Omega 3, 6 and 9 Matters
Omega 3 and omega 6 are "essential" fatty acids – the body can't produce them itself, so they need to come from diet. Oily fish, walnuts and flaxseed are rich in omega 3, while walnuts, almonds and sunflower oil are good omega 6 sources.
Omega 9 is "non-essential," since the body can produce it itself. It's found in oils and nuts like olive oil and macadamia nuts – since the body doesn't rely on dietary intake for it, there's no need to actively seek it out.
Too Much Omega 6 Isn't Ideal
Even though omega 6 is essential, balance matters. Modern Western diets tend to include far more omega 6 than omega 3, and this imbalance – rather than omega 6 itself – is what's been associated with increased inflammation in the body.
Some inflammation is a normal, healthy immune response, but when it becomes chronic, it's linked to health concerns including heart disease, obesity, diabetes and certain other chronic conditions.
Omega 6 still plays a genuine role in healthy skin, hair, bones and metabolism, so the goal isn't to eliminate it – it's to better balance it against omega 3 intake. Sunflower and corn oil, commonly used in home and restaurant cooking, are major sources of excess omega 6 in most diets. Swapping these for olive or coconut oil is a simple way to shift that balance.
Why Omega 3 Is So Essential
Omega 3 supports a wide range of bodily functions, with heart health being one of its best-known roles. It's also needed to help synthesise hormones involved in blood clotting, reproduction and immune function, and forms an essential part of cell membranes throughout the body.
Increasing omega 3 intake is generally a good goal, particularly for anyone who doesn't eat fish – which is why getting omega 3 without fish is worth understanding if that applies to you, or why an omega 3 supplement is often recommended for vegans and vegetarians specifically.
The take-home message: eat more nuts, seeds and oily fish, and swap sunflower or corn oil for olive or coconut oil where you can. If you're concerned about your intake, a dedicated omega 3 supplement – ideally one that doesn't also load you up on additional omega 6 – is a sensible option to consider.
