For me personally, I find anything that gives me a dopamine surge causes me to stutter more! Caffeine, sugar, refined carbs etc…. Coming off those substances has helped me be more fluent! I’m also on Fluoxetine which is a SSRI that helps to balance out neurotransmitters in the brain, such as dopamine etc. It’s helping a lot with my anxiety around stuttering and the lower dopamine has also helped tremendously.