Omega-3 polyunsaturated fatty acids, especially docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), play a fundamental role in brain health. They support neurodevelopment, synaptic function, neuronal plasticity, and neuroinflammation regulation.

🧬 Brain physiology and omega-3. DHA accounts for approximately 25–30% of brain fatty acids, especially in the cerebral cortex and retina. It is involved in: 

-Membrane fluidity

- Neurotransmission

- Synaptogenesis

- Neurogenesis and synaptic plasticity

📚 Salem N Jr et al., Lipids. 2001;36(9):945–959.

🧠 Neurodevelopment and pregnancy

During pregnancy and lactation, DHA is actively transferred to the fetus and infant, essential for:

- Prefrontal cortex development

- Visual maturation

- Cognitive and language outcomes

Low maternal omega-3 levels are associated with poorer infant cognitive scores and higher ADHD risk.

📚 Greenberg JA et al., Am J Clin Nutr. 2008;87(3):548S–552S.

🧠 Omega-3 and adult cognitive function. Clinical trials show that higher omega-3 intake is associated with:

- Reduced mild cognitive impairment (MCI)

- Lower Alzheimer’s disease risk

- Improved executive function, attention, and verbal memory

A 2020 meta-analysis concluded that EPA/DHA supplementation improves cognitive performance, especially in older adults with early decline.

📚 Zhang Y et al., J Nutr Health Aging. 2020;24(10):1061–1069.

🧠 Neuroinflammation, depression, and psychiatric disorders. Omega-3s modulate neuroinflammation by:

- ↓ pro-inflammatory cytokines (IL-1β, IL-6, TNF-α)

- ↑ resolvins and protectins

Clinical implications include:

* Major depression: EPA has shown antidepressant effects, especially in patients with elevated inflammatory markers.

* Schizophrenia and bipolar disorder: beneficial effects on negative symptoms and mood stability.

📚 Freeman MP et al., J Clin Psychiatry. 2006;67(12):1954–1967.

🧪 Clinical recommendations and dietary sources

Dosage:

- General prevention: 250–500 mg/day of EPA + DHA

- Cognitive or mood disorders: 1–2 g/day, under medical supervision

Sources:

- Fatty fish (salmon, sardines, mackerel)

- Fish oil

- Algae oil (vegan option)

- Fortified eggs, walnuts, flaxseeds (ALA source)

✅ Conclusion

Omega-3 fatty acids are essential for brain function throughout life. Their neuroprotective, cognitive, and emotional benefits are well supported by clinical research.

💡 Including them in the diet or supplementing when necessary is a key preventive and therapeutic strategy in neurological and mental health.