You need to get the DAN protocol (Defeat Autism Now) from Dr. Bernard Rimland at the Autism Research Institute.
http://www.autism.com/ari/contents.html Do a web search on Bernard Rimland. He has been treating autism as a biological disorder for thirty years and the DAN protocol worked wonders with my son.
When we went on the wheat-free, dairy-free diet the changes in my son were dramatic. But it doesn't work for everyone.
Thank-you...