The crucial role of vitamin D in brain development given further credence by Queensland researchers.  Giving mice vitamin D supplements during pregnancy prevented autism traits in their offspring, University of Queensland researchers have discovered.

“Our study used the most widely accepted developmental model of autism in which affected mice behave abnormally and show deficits in social interaction, basic learning and stereotyped behaviours,” lead researcher at the Queensland Brain Institute (QBI), Professor Darryl Eyles said. “We found that pregnant females treated with active vitamin D in the equivalent of the first trimester of pregnancy produced offspring that did not develop these deficits.”

In human studies, QBI researchers recently found a link between pregnant women with low Vitamin D levels and the increased likelihood of having a child with autistic traits. Sun exposure is the major source of vitamin D, which skin cells manufacture in response to UV rays, but it is also found in some foods including fish, fish-oils and egg yolks. Dr Wei Luan, a postdoctoral researcher involved in the study, said vitamin D was crucial for maintaining healthy bones, but the active hormonal form of vitamin D cannot be given to pregnant women because it may affect the skeleton of the developing foetus.

“Recent funding will now allow us to determine how much cholecalciferol, the supplement form that is safe for pregnant women, is needed to achieve the same levels of active hormonal vitamin D in the bloodstream,” Dr Luan said. “This new information will allow us to further investigate the ideal dose and timing of vitamin D supplementation for pregnant women.”

It was previously thought vitamin D had a protective anti-inflammatory effect during brain development, but the study didn’t find this to be the case. New funding from the National Health and Medical Research Council will allow researchers to continue to study how vitamin D protects against autism.

The study was published in Molecular Autism and included key collaborators from the Swiss Federal Institute of Technology.