Check out the above book. There are additional things beyond the gluten and casein restriction that might be helpful. I was reading it for background on the gluten issues when I picked up on the casein connection. There is more info to be gleaned, but it didn't seem pertinent to my specific interest at the time.
Thank you- will check the book out. We have made a lot of changes in our diet, overall. We found out my five year old goes CRAZY on artificial coloring, so those are pretty forbidden in our house (dairy impacts almost all of us to some degree, too, but we limit it to varying degrees.) We don’t do artificial sweeteners, and I am not a corn syrup fan.