Karl, you can try this website:
Nutrition You Can Live With, by Kathrynne Holden.
Murray Charter...rest his beautiful soul...who credits Kathrynne Holden MS RD, is still online and has a few more URLs that you can try:
Managing Parkinson's & Nutrition
MyParkinson'sInfo also has a few topics:
http://www.myparkinsonsinfo.com/cate...ion_exercise/2