I have had motor tics since I was seven years old. I've been on every possible medication, including antipsychotics, which have cause tardive dyskinesia in my face, heart medicines etc. etc., with no success. All of the supplements, magnesium, B vitamins, probiotics, niacin, etc. etc., make a huge difference but you have to be patient, as it could take up to two months to actually take affect, which is so worth it. Now, I was fully aware that dietary changes would probably help, but I didn't think I could cut out bread and dairy and sugar lol, but for the past two weeks, I have, and let me tell you, it was the best thing I could've ever done for my motor tics.
Once you get into the mode of it, as with exercising, you don't want to eat any other way. My IBS is so much better, almost nonexistent, I am way more energetic and I feel so much lighter and healthier overall, and in just a matter of two weeks. I have cut out all wheat products, beef, preservatives, additives, dyes, artificial flavors, sugar, In which I supplemented for birch wood sugar, which is a plant sugar obviously, dairy, citrus, potatoes, tomatoes, etc. etc. etc., and the big one, caffeine of any kind, COFFEE!!! UGGH LOL. I am 48 years old and have been drinking coffee since the end of high school but I found that if I put in 100% pure cacao And wheat grass juice powder in my smoothie every morning, not just energizes me, but boosts my mood tremendously. I can actually control my motor tics more than I ever have also, besides them subsiding.