Sugar isn't really a huge part of my diet, but i do find that caffeine and other how would i put it.. accelerants? Greatly effect my speech. I find my speech is much smoother if my mind is racing and my thoughts are scrambled. Like after my first or second cup of coffee or if i don't take my ritalin im much more fluent. I feel like if i have time to gather my thoughts my stutter is noticeably worse.