13/03/2026
The benefit of a gluten-free/casein-free diet is based on the theory that children with autism may have an allergy or high sensitivity to foods containing gluten or casein. Children with autism, according to the theory, process peptides and proteins in foods containing gluten and casein differently than other people do. Hypothetically, this difference in processing may exacerbate autistic symptoms.
Some believe that the brain treats these proteins like false opiate-like chemicals. The reaction to these chemicals, they say, leads a child to act in a certain way. The idea behind the use of the diet is to reduce symptoms and improve social and cognitive behaviors and speech.
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WebMD explains the theory behind the gluten-free/casein-free (GFCF) diet for autism.