Maybe it's a gene thing?
Apparently a research team has come up with a link between genetic damage and autism. This might explain why autistic kids are more common in some marriages than others, and why autistic behavior is linked to allergic reactions (there are some folks who think that autism is in fact an allergic reaction to various triggers) and digestive disorders. It would be interesting to see if they can find a link between Asperger's syndrome and an increased frequency of things like celiac, lactose intolerance, etc. (Kate)