{"id":68,"date":"2026-05-22T06:38:18","date_gmt":"2026-05-22T06:38:18","guid":{"rendered":"https:\/\/prorelocationteam.com\/?p=68"},"modified":"2026-05-22T06:38:18","modified_gmt":"2026-05-22T06:38:18","slug":"about-a-third-of-pregnant-women-in-the-us-lack-sufficient-vitamin-d-to-support-healthy-pregnancies-%e2%88%92-new-research","status":"publish","type":"post","link":"https:\/\/prorelocationteam.com\/?p=68","title":{"rendered":"About a third of pregnant women in the US lack sufficient vitamin D to support healthy pregnancies \u2212 new\u00a0research"},"content":{"rendered":"
\n

Children whose mothers had higher vitamin D levels during pregnancy scored better on tests of memory, attention and problem-solving skills at ages 7 to 12 compared with those whose mothers had lower levels. That is a key finding of a new peer-reviewed study that my colleagues and I published in The American Journal of Clinical Nutrition.<\/p>\n

Read more Parents don\u2019t need to try harder \u2013 to ease parenting stress, forget self\u2011reliance and look for ways to share the\u00a0care<\/a><\/p>\n

While vitamin D has long been known for its role in maintaining bone health, scientists have since uncovered its importance in regulating immune function, reducing inflammation and protecting the nervous system. Now, growing evidence \u2013 including our new findings \u2013 suggest it may also support brain development beginning in the womb.<\/p>\n

My team and I found that the link between prenatal vitamin D levels and childhood cognition was strongest among Black families, who also face higher rates of vitamin D deficiency. <\/p>\n

This suggests that vitamin D supplementation may be a promising, low-cost strategy to support brain development while reducing racial disparities. Our study also suggested that vitamin D levels early in pregnancy may be most important for childhood cognitive development, highlighting the importance of early action by health care providers.<\/p>\n

We analyzed more than 900 mother-child pairs across the U.S. who participated in a large national study called ECHO, short for Environmental influences on Child Health Outcomes. We measured vitamin D in the mothers\u2019 blood during pregnancy and assessed children\u2019s cognitive abilities using a standardized test battery. We also accounted for other important factors that shape childhood development such as the mother\u2019s education, neighborhood conditions and the child\u2019s age and sex.<\/p>\n

This new study builds on our earlier findings that higher vitamin D levels during pregnancy are linked to higher IQ in early childhood and with reduced behavioral problems in middle childhood. <\/p>\n

Collectively, these studies suggest that vitamin D plays a crucial role in brain development during pregnancy, with lasting benefits for children\u2019s cognitive and behavioral outcomes.<\/p>\n

Why it matters<\/h2>\n

Vitamin D deficiency is a common global problem. <\/p>\n

In the U.S., about 42% of adults have vitamin D levels below 20 nanograms per milliliter, or ng\/ml, a commonly used cutoff for deficiency. About a third of U.S. pregnant women are deficient, and the rates are even higher among Black pregnant women, with 80% found to be deficient. This racial difference is partly due to differences in skin pigmentation, as melanin pigment reduces the skin\u2019s ability to produce vitamin D from sunlight.<\/p>\n

Read more Teen drivers face unique challenges during \u2018100 deadliest days\u2019 of summer, but safety measures can make a\u00a0difference<\/a><\/p>\n

Although we can get vitamin D both from sun exposure and our diets, deficiency is common because these sources don\u2019t meet everyone\u2019s needs. Sunlight isn\u2019t always a reliable source, especially for people with darker skin, those living in northern climates or those who often wear sunscreen or sun-protective clothing. Natural food sources such as fatty fish, egg yolks and certain mushrooms contain some vitamin D, and fortified products such as milk and breakfast cereals help, but not everyone eats enough of these foods to maintain healthy vitamin D levels. <\/p>\n

That\u2019s why supplements are often necessary and are recommended in many cases by the Dietary Guidelines for Americans.<\/p>\n

Although current guidelines recommend that pregnant women consume 600 international units, or IUs, of vitamin D daily, higher doses of at least 1,000 to 2,000 IU are often needed to correct deficiency. On average, U.S. women consume from food and beverages, and many prenatal vitamins provide just 400 IU. This highlights an important opportunity for clinicians to improve screening and support around vitamin D supplementation both before and during pregnancy.<\/p>\n

If a simple, low-cost strategy such as prenatal vitamin D supplementation can help support brain development, it may yield lasting benefits for children. Long-term studies have shown that higher cognitive scores in childhood are linked to better memory and reasoning in older age, as well as longer lifespan.<\/p>\n

What still isn\u2019t known<\/h2>\n

While our studies have linked higher vitamin D levels in pregnancy to improved cognitive and behavioral development in children, we cannot yet prove that vitamin D is the direct cause. <\/p>\n

Therefore, studies called randomized controlled trials \u2013 the gold standard of research \u2013 are needed to confirm these findings and determine how best to translate them into clinical practice. These studies will be essential for determining the optimal target levels for vitamin D to support brain development in pregnancy. <\/p>\n

Read more Getting beyond answers like \u2018fine\u2019 and \u2018nothing\u2019: 5 simple ways to spark real talk with\u00a0kids<\/a><\/p>\n

The Research Brief is a short take on interesting academic work.<\/em><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Vitamin D has long been known to play essential roles in boosting immune health and protecting the nervous system. 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