Born dead,
I'm experimenting with low-carb/paleo for tics now and I'm thinking of going ketogenic to check the effects out on tics.
Tics can also get worse on low-carb but I think the most important thing is even blood sugar, either through many smaller meals with small amounts of carbohydrates or a full-blown ketogenic diet where fats are used to make ketone bodies and this kind of diet will make the blood sugar extremely stable and at the lowish end of normal (blood sugar seldom drops dangerously low unless you're diabetic).
I've also been reading about ketogenic diets and adenosine lately and I saw this review on adenosine where the writers talk about possible implications not only for epilepsy but also tourettes. Ketogenic diets (ie low-carb with highish fat) take some weeks to really work, because the body has to fully make the switch from carbs to ketones as fuel for the brain and body.
Anyways, adenosine works stabilizing for cells (caffeine for example antagonizes adenosine) and makes us calmer (and more sleepy) and a ketogenic diet increases the activiy of adenosine, which could possibly be huge for tourettes. I've noticed that I many times tic a lot less on zero carb on some days. The urge lessens and although I tic some it bothers me less and I feel just generally more even-tempered and my body is calmer.
Keep the discussion going; I think this might be important in the management for tics. I'll post again in a while. Take care people!
Edit: two links,
The study on a ketogenic diet for Tourettes wich very unfortunately didn't fly (not enough participants): http://clinicaltrials.gov/ct2/show/NCT00952601
A review of the modified Atkins diet (ketogenic diet), which is easier to follow than the original ketogenic diet used for epilepsy: http://www.ncbi.nlm.nih.gov/pubmed/19049584?dopt=Abstract