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Home | Health | Vitamin D Levels During Pregnancy Linked With Child Iq

Vitamin D levels during pregnancy linked with child IQ

By ANI
Published: Published Date - 01:44 PM, Tue - 3 November 20
Vitamin D levels during pregnancy linked with child IQ
Foods that contain higher levels of vitamin D include fatty fish, eggs and fortified sources like cow's milk and breakfast cereals.

Washington: A study published in The Journal of Nutrition showed that mothers’ vitamin D levels during pregnancy were associated with their children’s IQ, suggesting that higher vitamin D levels in pregnancy may lead to greater childhood IQ scores.

The study also identified significantly lower levels of vitamin D levels among Black pregnant women.

Melissa Melough, the lead author of the study and research scientist in the Department of Child Health, Behavior, and Development at Seattle Children’s Research Institute, says vitamin D deficiency is common among the general population as well as pregnant women, but notes that Black women are at greater risk.

Melough says she hopes the study will help health care providers address disparities among women of colour and those who are at higher risk for vitamin D deficiency.

“Melanin pigment protects the skin against sun damage, but by blocking UV rays, melanin also reduces vitamin D production in the skin. Because of this, we weren’t surprised to see high rates of vitamin D deficiency among Black pregnant women in our study. Even though many pregnant women take a prenatal vitamin, this may not correct an existing vitamin D deficiency,” Melough said.

“I hope our work brings greater awareness to this problem, shows the long-lasting implications of prenatal vitamin D for the child and their neurocognitive development, and highlights that there are certain groups providers should be paying closer attention to. Wide-spread testing of vitamin D levels is not generally recommended, but I think health care providers should be looking out for those who are at higher risk, including Black women,” added Melough.
Addressing disparities

According to Melough, as many as 80 per cent of Black pregnant women in the US may be deficient in vitamin D. Of the women who participated in the study, approximately 46 per cent of the mothers were deficient in vitamin D during their pregnancy, and vitamin D levels were lower among Black women compared to White women.

Melough and her co-authors used data from a cohort in Tennessee called the Conditions Affecting Neurocognitive Development and Learning in Early Childhood (CANDLE) study.

CANDLE researchers recruited pregnant women to join the study starting in 2006 and collected information over time about their children’s health and development.

After controlling for several other factors related to IQ, higher vitamin D levels in pregnancy were associated with higher IQ in children ages 4 to 6 years old. Although observational studies like this one cannot prove causation, Melough believes her findings have important implications and warrant further research.

Vitamin D deficiency

“Vitamin D deficiency is quite prevalent. The good news is there is a relatively easy solution. It can be difficult to get adequate vitamin D through diet, and not everyone can make up for this gap through sun exposure, so a good solution is to take a supplement,” Melough said.

The recommended daily intake of vitamin D is 600 international units (IU). On average, Americans consume less than 200 IU in their diet, and so if people aren’t making up that gap through sun exposure or supplementation, Melough says people will probably become deficient.

Foods that contain higher levels of vitamin D include fatty fish, eggs and fortified sources like cow’s milk and breakfast cereals. However, Melough notes that vitamin D is one of the most difficult nutrients to get in adequate amounts from our diets.

Additional research is needed to determine the optimal levels of vitamin D in pregnancy, but Melough hopes this study will help to develop nutritional recommendations for pregnant women.

Especially among Black women and those at high risk for vitamin D deficiency, nutritional supplementation and screening may be an impactful strategy for reducing health disparities.

Key takeaways

Melough says there are three key takeaways from the study:

1. Vitamin D deficiency is common during pregnancy, and Black women are at greater risk because melanin pigment in the skin reduces the production of vitamin D

2. Higher vitamin D levels among mothers during pregnancy may promote brain development and lead to higher childhood IQ scores

3. Screening and nutritional supplementation may correct vitamin D deficiency for those at high risk and promote cognitive function in offspring. “I want people to know that it’s a common problem and can affect children’s development. Vitamin D deficiency can occur even if you eat a healthy diet. Sometimes it’s related to our lifestyles, skin pigmentation or other factors outside of our control,” Melough said.

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