gluten-free And Autism in Parents, Friends and Loved Ones of Celiacs Posted February 20, 2011 · Report to Admin Hi - We started the gluten-free diet about 6 weeks ago for my son (he will be 3 in March). I have not noticed any change yet - it might be too soon though. I'm so glad that your daughter is doing well! It took awhile with my daughter as well, the first month was her detoxing from it. If anything, she felt worse in that time. Good luck!