Heather,
We've only been on Feingold for 1 year, so it's hard to be sure how much salicylates contribute to my older son's tics. In order of importance, I'm estimating the prime cause is strep antibodies, followed by stress, TV & computer screens, then maybe salicylates. We noticed the salicylates also cause ADHD and general bad behavior in him.
He is sensitive to maltodextrin and corn syrup and the artificial colors and flavors, but haven't noticed them causing ticcing. They might, but we eliminated all the grossest foods and additives first and his attention & behavior improved FAST. The tics are almost non-existent now, but experience has shown us that by far the greatest threat is strep and other infections.
The Irlen light threrapy has helped a lot; he LOVES to read now and I suspect that may have helped in OCD and tics.
We've discovered all this over just the past year; add in fish oil and various supplements and garlic and it's hard to directly identify every cause and effect.
But overall, he's dramatically better balanced and I'm thinking a summer of exercise will help immeasurably. I don't see enough discussion of EXERCISE on this board. Exercise obviously contributes to better sleep. Exercise has been proven to improve immune function.
It's a lot to keep track of and I'm grateful for this board; wish I could be more help, but it'll take time to learn more.
Frank