Omega-3s Across the Lifespan - A Lifelong Essential

Most people know omega-3 fatty acids are good for them. But fewer realise just how differently, and how significantly, these nutrients shape our health from the very first weeks of life through to our mature years.

There are three main types worth knowing: DHA and EPA, found primarily in oily fish, and ALA, found in nuts and seeds. While ALA can be converted to DHA and EPA in the body, this process is inefficient — which is why dietary sources matter.

Here's what the science tells us about this key nutrient at different life stages:

Infancy

The first months of life represent one of the most rapid periods of brain development we will ever experience. DHA accumulates quickly in the developing brain and retina, and breast milk from a well-nourished mother is a critical source. Research consistently links adequate infant DHA intake to better visual acuity and stronger cognitive development outcomes.

Childhood

Brain growth doesn't slow down once a child starts school. Studies have linked omega-3 status in school-age children with reading ability, attention, and behaviour regulation. Despite this, most children fall short of recommended intakes (it can be hard to get kids to eat fish, nuts and seeds) making this a key nutritional gap worth addressing with a clinical nutritionist.

Adolescence

The teenage years bring a second major phase of brain remodelling. Emerging research suggests omega-3s play a role in mood regulation during this window, with lower levels linked to a higher risk of depressive symptoms. Given how common mental health challenges are in adolescence, this is an area of growing clinical interest.

Fertility & Pregnancy

For anyone planning a pregbook a clinical nutrition consultationnancy or already expecting, DHA is non-negotiable. It is essential for foetal brain and eye development, and higher maternal intake has been associated with longer gestation periods. Gestational period (time the baby is in the womb) matters because the final weeks of pregnancy are critical for brain maturation, lung development, and healthy birth weight - making full-term gestation a meaningful health outcome to strive towards.

There is also emerging evidence that omega-3s support sperm quality and hormonal balance - making them relevant for both partners when trying to conceive.

Healthy Ageing

As we age, chronic low-grade inflammation becomes one of the key drivers of disease, from cardiovascular conditions to cognitive decline. Higher omega-3 levels, particularly EPA, are associated with better resolution of this inflammation, improved heart health markers, and preserved brain function in older adults. Numerous clinical studies have now also associated long-term, sustained omega-3 intake with reduced cognitive decline and Alzheimer’s disease.

Are You Meeting Your Needs?

Omega-3 requirements shift across every stage of life, and whether you're eating enough - or the right sources - depends on where you are right now. If you are unsure that you are meeting your unique requirements for your current Lifestage, then please get in touch with any questions or book a clinical nutrition consultation.