Omega-3 fatty acids are among the most well-researched nutrients in modern nutrition science, and for good reason. These essential fats play a critical role in brain function, heart health, joint mobility, and inflammation management throughout the body. Because our bodies cannot produce omega-3s on their own, we must obtain them through food or supplementation. Yet despite their importance, many people fall short of the recommended intake — often without realising it.
Understanding the Three Types of Omega-3
Not all omega-3 fatty acids are created equal. The three main types are EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), and ALA (alpha-linolenic acid). EPA and DHA are found primarily in marine sources and are the forms most readily used by the body. EPA is particularly valued for its anti-inflammatory properties, while DHA is a major structural component of the brain and retina. ALA, found in plant-based sources like flaxseed, chia seeds, and walnuts, must be converted into EPA and DHA by the body — a process that is unfortunately quite inefficient, with conversion rates typically below ten percent.
This distinction matters when planning your diet. While ALA-rich foods are certainly beneficial and provide additional fibre and nutrients, relying solely on plant sources may not deliver enough active EPA and DHA. For those following a vegetarian or vegan diet, algae-based omega-3 supplements offer a direct source of DHA and EPA without the need for fish.
Health Benefits and Best Food Sources
The health benefits of adequate omega-3 intake are wide-ranging and well-documented. For the heart, omega-3s help lower triglycerides, reduce blood pressure, and decrease the risk of abnormal heart rhythms. For the brain, DHA supports cognitive function, memory, and mood regulation — research suggests that higher omega-3 intake is associated with a lower risk of depression and cognitive decline. For the joints, the anti-inflammatory effects of EPA can help reduce stiffness and discomfort, making omega-3s particularly valuable for those with inflammatory conditions.
The best dietary sources of EPA and DHA are oily fish such as salmon, mackerel, sardines, anchovies, and herring. Aim for at least two portions of oily fish per week to meet general recommendations. Plant-based sources of ALA include ground flaxseed, chia seeds, hemp seeds, and walnuts, all of which make excellent additions to smoothies, porridge, and salads. Fortified foods such as certain eggs, milk, and yoghurt can also contribute to your intake.
Supplements, Daily Intake, and Signs of Deficiency
When it comes to supplements versus whole foods, a food-first approach is generally recommended. Whole foods provide omega-3s alongside other beneficial nutrients like protein, selenium, and vitamin D. However, if you do not regularly eat oily fish, a high-quality fish oil or algae oil supplement can help bridge the gap. Most health organisations recommend a combined intake of at least 250 to 500 milligrams of EPA and DHA per day for general health, with higher amounts sometimes suggested for specific conditions under professional guidance.
Signs that you may not be getting enough omega-3 include dry or flaky skin, brittle nails, difficulty concentrating, low mood, and joint stiffness. While these symptoms can have many causes, they are worth discussing with a healthcare professional, especially if your diet is low in the food sources mentioned above. Prioritising omega-3-rich foods is a simple yet powerful step towards supporting your overall health — from your brain and heart right through to your skin and joints.