I can most certainly confirm one thing for certain with respect to myself and creativity and gut health. About 10 years ago when I changed my diet drastically, there were monumental hurdles in my percussion and drumming abilities that were overcome. I used to play the same boring monotonous practice routines for years. Over and over I would sit down with no real drive or interesting revelations to my abilities or creative process. The same cover songs were attempted over and over and of course I still semi enjoyed playing them. Then, over the course of a few months along with the vitamins and minerals I was starting to take as well as landing a job outdoors in the blistering FL heat, I noticed that jittery anxious drumming style was starting to go away. Almost like the brain fog and stress of keeping up with the groove was almost completely gone. I could breathe and think inside and outside of these fast and slow changes. It dawned on me one day when I nailed an old Steve Gadd part that had alluded me for years. The complexity was always a god level tier that no matter how I executed, there was no amount of listening or practice that could finish it with out fumbling. I took my 21speed bike out for a decent 17+mi ride listening to some old classics in my ears and lo and behold it was apparent I could finally hear it. Truly hear it and know it. I sat down at my drum kit about an hour later and just like a kid learning something for the first time, it happened. I was calmer, more focused, open to chaos but still able to control the playability with out it overwhelming me. Honestly, just being a more healthy person. Eating less processed foods out of a box and cutting out all the soda, junk food and sweets. Adding more vitamins and minerals, probiotics and drinking more water has had a huge mental and physical benefit. Surely this added to my creative process's and the technical execution in my abilities. If I had to describe it, it was like taking all the static out of the process and having a closer direct line to the expression of what ever your feeling at the time. I am no where near the dull and almost caveman like percussionist I used to be prior to taking back my diet and nutrition. Im pretty sure there was a process of detoxification that I started from the inside out and most certainly over time it helped me play and express my self better.