Food allergies can make a huge difference. I have a friend with a child who is autistic and they've seen big improvements by cutting out gluten. Some people can tolorate different forms of grain - is it possible to doc meant that the only form of wheat he wasn't allergic to was Kamut? I know spelt is often tolorated by people with gluten issues.
An easy way to start on an elimination diet is to go with foods that are known to have low allergens - rice, for example - and slowly start to add other foods in.
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