As this post from yesterday’s Autisable notes, Vitamin D has been becoming more accepted as a possible explanation for some forms of autism. I’ve been proposing that light’s effect on the pineal gland has been regulating testosterone levels in directions that can cause autism, predicting in 1998 (sexualselection.org) that equatorial populations moving to northern climes would evidence higher percentages of autism.
Both my pineal theory, based on fluctuating testosterone levels, and the Vitamin D theory suggest that there would be clear season of birth effects with autistic children being conceived in certain times of the year. I’ve not seen studies that support that prediction.
