Danish study links higher vitamin D in late pregnancy to small memory gains in children at age ten

Summary

A Danish study suggests that boosting vitamin D intake in late pregnancy may be linked to small improvements in verbal and visual memory in children at age ten, though effects are modest and not tied to broader cognitive abilities. The finding comes from a post-hoc analysis of a trial originally designed to test wheeze and asthma risk, so replication is needed and conclusions should be cautious.

• Higher dose: 2,800 IU daily vs standard 400 IU
• Memory improvements observed on recalling words and patterns but not on overall intelligence or attention
• Improvements weakened after correcting for multiple statistical tests
• Results predominantly in white participants, limiting generalizability

Original publisher: Nature

Overview

The article discusses a Danish randomized trial in which pregnant women received either a higher dose of vitamin D (2,800 IU daily from week 24 of gestation until one week after birth) or the standard Danish dose (400 IU). The original trial aimed to assess the risk of persistent wheeze and asthma in offspring. About 623 children were enrolled; 498 returned for cognitive testing around age ten. The authors conducted a post-hoc secondary analysis to explore cognition, specifically memory performance, rather than predefine cognitive outcomes. After adjusting for potential confounders, the researchers observed that children in the higher-dose group performed slightly better on verbal and visual memory tasks, recalling words and visual patterns. They initially showed a faster switch between problem-solving rules, but this advantage did not remain confidently significant after accounting for multiple tests.