Women who plan on becoming pregnant are told they need enough of the nutrient folate to ensure proper neurodevelopment of their babies, but new research from the Johns Hopkins Bloomberg School of Public Health suggests there could be serious risks in having far too much of the same nutrient.
The researchers found that if a new mother has a very high level of folate right after giving birth – more than four times what is considered adequate – the risk that her child will develop an autism spectrum disorder doubles. Very high vitamin B12 levels in new moms are also potentially harmful, tripling the risk that her offspring will develop an autism spectrum disorder. If both levels are extremely high, the risk that a child develops the disorder increases 17.6 times. Folate, a B vitamin, is found naturally in fruits and vegetables, while the synthetic version, folic acid, is used to fortify cereals and breads in the United States and in vitamin supplements.
The findings were presented May 13 at the 2016 International Meeting for Autism Research in Baltimore.
“Adequate supplementation is protective: That’s still the story with folic acid,” says one of the study’s senior authors, Dr. M. Daniele Fallin, director of the Bloomberg School’s Wendy Klag Center for Autism and Developmental Disabilities. “We have long known that a folate deficiency in pregnant mothers is detrimental to her child’s development. But what this tells us is that excessive amounts may also cause harm. We must aim for optimal levels of this important nutrient.”