University of Rochester researchers found that restoring iron after birth did not fully reverse brain mineral imbalances and gene changes caused by deficiency during early pregnancy.
Research from the University of Rochester suggests that low iron during early pregnancy can leave a lasting imprint on the developing brain, even when blood levels later recover. The work, published in The Journal of Nutrition, adds to earlier evidence that poor maternal iron status in the first trimester is associated with a higher risk of neurodevelopmental problems in children, including autism, ADHD and learning difficulties, according to the university’s summary of the findings.
The study used mice fed iron-deficient diets before conception and throughout pregnancy, then switched all offspring to an iron-sufficient diet after birth. That approach allowed the researchers to test whether early damage could be reversed. While iron levels in the blood returned to normal, the brain did not fully recover. Some regions remained iron-poor, while others showed excessive accumulation, suggesting that a simple blood test may miss more subtle and persistent changes in the nervous system.
Margot Mayer-Proschel, the study’s lead author and a professor of biomedical genetics and neuroscience at the University of Rochester School of Medicine and Dentistry, said the findings point to a critical window in pregnancy when the brain depends heavily on iron. The team also reported broader mineral imbalances, including changes in calcium, magnesium, manganese, copper and zinc, alongside altered activity in genes linked to brain development and communication between nerve cells. Those shifts were seen in several regions, including the cortex, hippocampus and thalamus, with especially notable changes in the superior colliculus, which helps process sensory information and direct attention.
The findings fit with a wider body of research showing that maternal iron status matters for infant brain development. A study indexed in PubMed and published in BJOG: An International Journal of Obstetrics and Gynaecology found that gestational iron status can affect infant haematological and neurodevelopmental outcomes, reinforcing the importance of early screening and effective iron replacement. A separate systematic review in Critical Reviews in Food Science and Nutrition also concluded that both iron deficiency and excess during pregnancy may affect mental and psychomotor development, underscoring the need for carefully tailored supplementation rather than a one-size-fits-all approach.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
