Excerpted from: abcnews.go.com

A popular diet intended to curb the effects of autism received yet another blow today in the form of a new study that found that autistic children who adhered to a gluten-free, casein-free diet showed no improvement in their symptoms.

Gluten is a protein found in wheat, and casein is a protein found in dairy products.

Dr. Susan Hyman, lead author of the study, said she knows that some families would be surprised by the team's findings, especially given the reports of dramatic clinical improvement observed by many families using the diet.