It appears gut bacteria are a prime cause, and solution to, at least this indication of Parkinson’s.
Perhaps the best way to help, outside of getting a fecal transplant, is to use fermented foods and beverages, prebiotic soluble fiber, and probiotic supplements, along with a lower carb-type diet and exercise, with what is becoming known.
Who would have thought gut germs were so helpful?
You can take one of these wherever you go, no need for a transplant!
https://farmandranchdepot.com/Milking_Stools/