DHA in Early Pregnancy: Critical for Fetal Brain, Eye, and Nervous System Development

DHA (docosahexaenoic acid, 22:6 n‑3) is the **predominant structural omega‑3 in brain and retina**. First trimester is foundational.

Key Developmental Roles

1. Brain: Neuronal membrane fluidity, synaptogenesis, neurogenesis, neurotransmission. Accumulates rapidly in 3rd trimester but starts early.
2. Retina: Photoreceptor outer segments (50–60% DHA) – visual acuity, signal transduction.
3. Nervous System: Myelination, signal propagation, neuroprotection.
4. Immune Programming: Modulates inflammation, may reduce allergy/atopy risk.
5. Preterm Birth Reduction: Meta‑analyses show ~40–50% ↓ early preterm (<34 wks) with ~600–800 mg DHA/day.

Intake Recommendations

• Pregnancy: 200–300 mg DHA/day (ISSFAL, GOED, ACOG).
• Sources:
  • Fatty fish: salmon (1.2 g/100g), sardines, mackerel, herring, anchovies.
  • Algal oil (vegan DHA) – 200–500 mg/capsule.
  • Fortified eggs, milk, yogurt.
• Limit: High‑mercury fish (shark, swordfish, king mackerel, tilefish).

Practical Advice

1. Eat 2–3 servings low‑mercury fatty fish/week.
2. If not achievable, take quality algal/fish oil supplement (3rd‑party tested).
3. Start preconception if possible—DHA status at conception matters.
4. Discuss with OB/RDN for personalized dose.

DHA is one of the few nutrients with strong evidence for structural neurodevelopmental benefit. Prioritize it.