As a mother of an almost 8 year old with autism, let me support the previous post re celiac and casein. Some of our kids don't test positive for classic celiac. They do have neurological rather than solely GI allergic reactions to gluten and casein. They are just as gluten (and casein) intolerant, but it doesn't necessarily manifest itself the way traditional celiac does. To provide the mother with more info, apparently the proteins get into the bloodstream, go to the brain and can look like pseudo-neurotransmitters. Gluten tends to make the child tantrummy and inflexible, casein can seem to have less effect until you try a classic challenge, then you can really see what it's doing to your child. Be very strict about the casein for 2 weeks or so, then let him have something really toxic like macaroni and cheese (both gluten and casein) your child may look more psychotic than autistic as a result. You may not want to bother to try this as it's very scary and not too great for the kid. Also, try epsom salt baths at night, every night for 2 weeks or so while maintaining a STRICT gluten and casein free diet, see what happens to the childs language and then let me know. Many parents doing this have seen dramatic to subtle improvement in mood, cooperativeness and language, as well as motor skills. Sorry if this has all been discussed in earlier posts. Candace