Last September. Herbsprout reported that scientists found evidence that Parkinson's disease may originate in the gut. Building on that discovery, scientists found the strains of gut microbes that may prevent Parkinson's, each finding building on the next.
It is not yet conclusive whether or not the a-synuclein build up occurs first in our gut, and before or after it reaches the brain. This study was tested in round worms, and is proven as a preventive measure. It is not able to treat Parkinson's disease but prevent it's growth. While further studies are required , it poses the possibility of a preventive dietary supplement, according to scientists involved in this study (see article https://www.cell.com/cell-reports/home).
Other articles by Herbsprout include microbial treatments for Parkinson's, https://en.bloguru.com/healthtech/360989/microbial-treatments-for-parkinsons ; and Parkinson's disease may originate in the gut, https://en.bloguru.com/healthtech/357162/parkinsons-may-originate-in-the-gut .