Proponents of the "leaky gut" theory (which I subscribe to at least insofar as it can lead to autistic behaviors) say that it is the fact that these foods are getting out into our bloodstream where they shouldn't be which causes the unnatural immune response. A majority of autistic kids also have eczema, allergies, asthma, and/or chronic ear infections, and when they go on the diet all of these symptoms miraculously clear up as well--even if they were allergic to say, eggs, which they can still eat on the diet.
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