What worries me is that the cause and effect is not always obvious. In my case, the fatigue builds up over time. In my son's case, first the tummy aches, then the behavior issues built up over time. I've also read (and don't even know if this is true) that teens often experience a "relaxing" of GI symptoms for a period of years which can make them believe that they can eat gluten. I don't know the answer, but we keep a GF/vegan house and always take snacks with us. This is life as we know it, and my 7yo has yet to question it. We talk about putting healthy foods in our bodies and not eating foods that make us feel bad. We haven't experienced any "fitting in" issues yet (except for dh and me - LOL). I too am interested in hearing from folks with older children that were raised GF...