My 9 year old son started stuttering when he was around 4 years old. He seemed to be sensitive to preservatives especially 211 and I have steered clear of this preservative, but a few weeks ago his stuttering came back in full force, around the same time I had apple juice in the house. He is a big juice addict, and thinking back, has always had juice, either straight or diluted. I have always watched out for the preservatives in juice, and bread, but I now think he is intolerant to salicylates
as well. I have changed all of his foods to failsafe foods, and his speech is now good. He has calmed down a bit as well.