The latest issue of 'Progress' has a section on 'A gut feeling about Parkinson's ' which is a very belated recognition of work done almost 20 years ago by Heiko Braak and others demonstrating the origin of PD to be in the gut/brain nerve circuits and presumed the cause to be toxin of some sort from the gut.
It is highly logical to suppose that long-term damage to a small part of the feedback from gut to brain to gut might result in the highly selective absorption mechanism being disrupted and nerve damage resulting from that imbalance of nutrients.
As a result of this work the Parkinson's Improvement Programme was started 7 years ago. Some users have been on it for all that time and have noticed a return of lost functions such as armswing and sense of smell and better balance and sleep. Reduced pain and cramps and greatly improved fine motor control are also found. Many find that they are able to resume occupations such as artwork, playing instruments and cycling.
This is NOT a drug treatment but consists of food additives and supplements blended into a mix supplied free to users by the charity. If you are interested please contact at email@example.com