Minneapolis Somali children have an autism rate significantly higher than the average, could vitamin D (or lack of) play a part in this?
Reduced serum concentrations of 25-hydroxy vitamin D in children with autism: Relation to autoimmunity
Autistic children had significantly lower serum levels of 25-hydroxy vitamin D than healthy children (P < 0.001) with 40% and 48% being vitamin D deficient and insufficient, respectively. Serum 25-hydroxy vitamin D had significant negative correlations with Childhood Autism Rating Scale (P < 0.001). Increased levels of serum anti-MAG auto-antibodies were found in 70% of autistic patients. Serum 25-hydroxy vitamin D levels had significant negative correlations with serum levels of anti-MAG auto-antibodies (P < 0.001).
A blog about it from autism research Paul Whitely: