Connection between gluten-free, casein-free diets (gfcf) and autism/Asperger’s.
Briefly, gluten is a protein, and so is casein. Gluten is a protein fraction found in all wheat, rye, barley, and most oat products. Casein is a protein fraction found in all dairy products. To most Autistic children, gluten and casein are the equivalent of poison. They leak into the gut, undigested, and attach to the opiate receptors of the autistic's brain. Essentially, many autistic children are "drugged" on wheat and milk products, as if they were on a morphine drip.
Although parents have been reporting a connection between autism and diet for decades, there is now a growing body of research that shows that certain foods seem to be affecting the developing brains of some children and causing autistic behaviours. This is not because of allergies, but because many of these children are unable to properly break down certain proteins.
Researchers in England, Norway, and at the University of Florida had previously found peptides (breakdown products of proteins) with opiate activity in the urine of a high percentage of autistic children. Opiates are drugs, like morphine, which affect brain function. These findings have recently been confirmed by researchers at the Ortho Clinical Diagnostics. The two main offenders seem to be gluten (the protein in wheat, oats, rye and barley) and casein (milk protein.)
This is from this site:
Asperger's Syndrome
Since plain popcorn and plain rice don't have gluten or casein, this might not be an entirely bad thing. And he may be addicted to them...and he may be adapting a preference to white-foods. I hope this might help you and if not I am sorry, and the best of luck and patience to you...