Nancy, If you are thinking there is a possibility of celiac, that could be the cause of the diarrhea. Looking at his diet from a celiac point of view, there are many possible causes of diarrhea, i.e., Kix, Froot Loops, pasta, graham crackers. chicken nuggets and crumb cake. How long has he been off milk? I have heard that for some odd reason that when you go off gluten (for celiac) the symptoms of dairy problems are magnified. Maybe this is the reverse? I don't really know, I am just throwing out a possibility. Kathy