The new study, just published in the Journal of Autism and Developmental Disorders, is the first randomized, well-controlled study of gluten-free diets in children with autism. The scientists, all from the University of Warsaw, Poland, recruited 66 children, and assigned half of them at random to a gluten-free diet. The other half were given a normal diet, with at least one meal a day containing gluten, for 6 months. The children ranged from 3 to 5 years old. After 6 months, the scientists evaluated all children using multiple standardized measurements of autistic behavior.
The results were very clear: the study found no difference between the diets. None of the core symptoms of ASD were different between children in the two groups, and there were no differences in gastrointestinal symptoms either.