Choline for Pregnancy
Choline is an essential nutrient that pregnant people should get enough of (about 450 mg/day), but the evidence that taking extra choline supplements measurably improves a child's brain development is still preliminary and unproven.
Why this grade7-layer evidence engine
Two claims must be kept apart. Health authorities agree that adequate choline matters in pregnancy: the Mayo Clinic calls it important for the baby's brain, nerve and spinal cord development and sets the need at 450 mg/day, and the Cleveland Clinic warns that too little choline raises the risk of brain and spinal cord problems. The US FDA classifies choline only as a "nutrient supplement," and WHO addresses it as an essential ingredient in infant formula, not as a therapeutic supplement.
The separate question, whether taking extra choline beyond adequacy boosts a child's cognition, has only thin direct evidence. Two small double-blind feeding trials from one research group found benefits at a high dose (930 vs 480 mg/day): faster infant information-processing speed (PMID 29217669) and better sustained attention at age 7 (PMID 34962672). A cohort study showed a modest, inconsistent positive trend (PMID 23425631).
These positive signals are limited by very small trial sizes (n=20-26) and the fact that most outcomes within each study were null. A 2025 systematic review of nine studies (PMID 40077755) concluded the evidence is insufficient to either support or refute a benefit. Hence a B (preliminary) grade: ensure dietary adequacy, but do not expect supplements to raise infant intelligence or replace folic acid for neural-tube-defect prevention, and avoid high doses near the 3.5 g/day upper limit.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.628
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (0 positive vs 1 negative)，由 raw_score 決定
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status