Just read a book Younger Next Year which discusses diet and exercise and indicates that when exercising, you need to sweat to get the most benefit.

Also, another glimmer of hope discusses New research which:

shows that, when properly manipulated, a population of support cells found in the brain called astrocytes could provide a new and promising approach to treat Parkinson's disease. These findings, which were made using an animal model of the disease, demonstrate that a single therapy could simultaneously repair the multiple types of neurological damage caused by Parkinson's, providing an overall benefit that has not been achieved in other approaches.

http://www.sciencedaily.com/releases...0128184809.htm