For those who stutter or helped a person who stuttered, does diet affect stuttering?

So, I stutter like have a speech impediment. I've had it my whole life and want it gone since I am trying to get a full-time job soon and not many jobs will hire me if my speech isn't fluent or as close to fluent as possible.

I saw somewhere that what could affect stuttering negatively are preservatives, salicylates, amines, dairy foods, and wheat. Is that true? Also if anyone tried to avoid those ingredients did it change much for the stuttering? Last question, was it difficult to avoid these ingredients?
For those who stutter or helped a person who stuttered, does diet affect stuttering?
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