A recent extensive review of the literature by the Cochrane Library indicates that there is a lack of evidence to support the practice of gluten and casein free diets as an effective treatment for autism.  Much larger studies are recommended to determine is this is an effective treatment and potential side effects. 

Reference:  Millward C, Ferriter M, Calver S, Connell-Jones G. Gluten- and casein-free diets for autistic spectrum disorder. Cochrane Database of Systematic Reviews 2008, Issue 2. Art. No.: CD003498. DOI: 10.1002/14651858.CD003498.pub3 

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