Omega-3 fatty acids are more than just heart-healthy fats—they’re essential for the structure and function of the brain. From improving mood stability to supporting emotional resilience, omega-3s—particularly EPA and DHA—have been shown to play a central role in mental health. 

Emerging evidence, including recent brain imaging studies, suggests that omega-3s may impact how we think, feel, and respond to stress. Whether through diet or a high-quality fish oil supplement, getting enough omega-3 is a smart step in supporting mental wellbeing.  

What Are Omega-3 Fatty Acids? 

Omega-3s are polyunsaturated fatty acids (PUFAs) the body can’t produce on its own. They must come from the diet or a fish oil supplement. There are three primary types: 

• ALA (alpha-linolenic acid) – found in chia seeds, flaxseeds, and walnuts 

• EPA (eicosapentaenoic acid) – found in fatty fish and fish oil 

• DHA (docosahexaenoic acid) – a key fat in the brain and retina, also abundant in oily fish 

While ALA is beneficial, it is EPA and DHA—found in omega-3 fish oil supplements and marine sources—that offer the most powerful support for brain health and emotional wellbeing. 

The Role of Omega-3s in Brain Function 

The brain is nearly 60% fat (1), and DHA is a major structural component. Omega-3 fatty acids, particularly docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), are essential components of nerve cell membranes, supporting brain circuitry and information processing speed.  

Omega-3s contribute to brain function in several ways: 

• Maintain neuronal membrane structure and fluidity 

• Support neuroplasticity—the brain’s ability to adapt and reorganise 

• Reduce neuroinflammation, a factor linked to depression and cognitive decline 

• Influence production of mood-regulating neurotransmitters, including serotonin and dopamine 

• Increases learning, memory, cognitive well-being, and blood flow to the brain (2).  

A deficiency in omega-3s can impair these processes, especially in developing brains or during periods of emotional stress. 

Omega-3 Deficiency and Mental Health 

Low levels of omega-3 fatty acids—particularly EPA and DHA—have been linked to a range of mental health concerns, including: 

• Depression 

• Anxiety 

• Mood swings 

• Cognitive decline 

• Attention deficit disorders 

A 2020 review (3) confirmed that individuals with low omega-3 status had significantly higher risks of mood disorders. This may be due to disrupted brain inflammation pathways and weakened neurochemical signalling. 

New Research: Brain Connectivity and Omega-3 in Young Adults 

A recent study (4) explored how omega-3 status affects brain connectivity and mood in young adults (18–29 years old) experiencing subthreshold depression*. 

* a level of depressive symptoms that are not severe enough to meet the criteria for a formal diagnosis of a depressive disorder, such as major depressive disorder. 

Key Findings: 

• Higher Omega-3 Index (combined EPA + DHA) was associated with lower depression scores.  

• Functional magnetic resonance imaging scans showed greater functional connectivity between: 

• The amygdala and posterior cingulate cortex  

• The orbitofrontal cortex and angular gyrus 

• These brain regions are involved in emotional regulation and self-awareness, suggesting omega-3s support the brain’s mood circuitry 

This study reinforces the value of omega-3 for emotional wellbeing and offers compelling insight into how these essential fats impact real-time brain activity—not just symptom scores. 

Omega-3-Rich Foods to Support Mental Wellbeing 

There are many natural ways to boost your omega-3 intake through food (5): 

Marine Sources (rich in EPA & DHA) 

• Wild-caught salmon 

• Sardines 

• Mackerel 

• Herring 

• Anchovies 

Plant-Based Sources (rich in ALA) 

• Chia seeds 

• Ground flaxseeds 

• Walnuts 

• Hemp seeds 

• Algal oil (vegan-friendly DHA) 

If your diet lacks regular oily fish, consider a pure fish oil supplement for brain support. Look for one that is sustainably sourced and tested for heavy metals. 

Fish Oil Supplements: A Convenient Way to Support Brain Health 

For many people, achieving consistent omega-3 intake from food alone can be a challenge. A high-quality fish oil supplement can help bridge the gap—especially for those experiencing low mood, chronic stress, or cognitive fatigue. 

When choosing an omega-3 fish oil: 

• Look for products with a high Omega-3 Index 

• Ensure it contains meaningful doses of EPA and DHA 

• Opt for capsules that are tested for purity and heavy metal safety 

Omega-3 supplementation has been shown to support mood, memory, learning, and mental clarity (2) —making it a valuable part of a mental wellness toolkit. 

How Much EPA and DHA Should a Fish Oil Supplement Provide? 

When choosing a high-quality omega-3 fish oil supplement, it’s important to ensure it delivers clinically relevant doses of EPA and DHA—the two omega-3s most strongly linked to brain and mood support. 

Recommended Dosage Ranges: 

• General wellbeing & maintenance:
   250–500 mg/day of combined EPA + DHA (6) 

• Mood and cognitive support:
   1,000–2,000 mg/day of combined EPA + DHA – with a higher proportion of EPA often showing stronger results in mood-related studies (7).  

Tip: Always speak with a healthcare provider before starting high-dose omega-3 supplementation—especially if you’re taking blood thinners or have existing health conditions. 

Nourish the Brain, Support the Mind 

The link between omega-3 fatty acids and mental health is growing stronger with every study. From regulating mood and cognition to reshaping brain connectivity, EPA and DHA are powerful allies in supporting emotional resilience and overall wellbeing. 

By eating more omega-3-rich foods and considering a trusted fish oil supplement, you can take a simple, evidence-based step toward a healthier, more balanced mind—naturally. 

References 

1. Chang et al., Acta Neurol Taiwan. 2009 Dec; 18(4):231–241 
2. Dighriri et al., Cureus. 2022 Oct; 14(10):e30091
3. Zhang et al., Transl Psychiatry. 2020; 10:193
4. Faulkner et al., Prostaglandins Leukot Essent Fatty Acids. 2025 Apr; 204:102664 
5. https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/
6. https://knowledge4policy.ec.europa.eu/health-promotion-knowledge-gateway/dietary-fats-table-4_en
7. Liao et al., Transl Psychiatry. 2019 Aug; 9(1):190