Legacy AI grade · Sources dated 2026-06-01. Not expert reviewed. Coverage is limited to the listed sources. About the new summary workflow
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