I am new to this sort of thing. My son, Ryan, is four years old. About a year ago, he was diagnosed as PDD-NOS. We have gone to a DAN doctor and Ryan is on Super NuThera, TMG, Zinc, Vitamin C, and B12 injections (they started yesterday). We tried the GFCF diet. It helped his bowels but he was loosing weight rapidly. We are now suppose to try a diet free of artificial colors, artificial preservatives, and sugar. I found a great substitute for sugar called Stevia Extract. Anyone have any suggestions on how to start this diet when Ryan is so picky? I appriciate your time. I understand how busy all of your lives must be. Thank you again.