We've done gluten free. It was actually fairly easy in comparison to what I thought it would be. It's such a common intolerance these days there are lots of substitute options. What I did find was that a lot of gluten free manufactured products other than the basics ruin any benefit by being very high in sugar, so that's something to watch out for. In the end we found it was actually yeast that was our problem. Gluten intolerance was a symptom of yeast intolerance, because yeast rips tiny holes in the gut allowing the gluten heroin-like peptides to get into the bloodstream. By dealing with the yeast issue, we've been able to slowly bring back in gluten as long as it is not wheat based, so oats etc. are okay. We've left off the wheat because it feeds yeast only like cane sugar can. We also started doing some biomedical therapy, which included a zinc supplement, Fermplus which is a heavy duty probiotic (much better than inner health plus - they're not that good, just easier to get a hold of), a cup of homemade yogurt a day, giving her a glass of Keifer water a day and putting 1/2 cup of Epsom salts in her bath. We've seen huge improvements with this. We've gone from the hitting, biting, off her head meltdowns to a meltdown now being a grrr look on her face, the stamping of feet and sometimes when she's really losing it the F-word. We've heard this word a lot more lately because of issues with school, but she snaps out of it pretty quickly and apologises without needing a cue. Not all of it of course is from the biomedical therapy and diet changes alone, but they have played a very big part. I can absolutely tell when someone like her aunt hasn't thought about it much and given her a donut - lots of F-words.