This is a good read although it is an older post:
forum.parkinson.org/topic/1...
Extract:
What's the biggest mistake many people over 50 make when it comes to their medications? Failing to read the warning labels that come with their prescriptions, according to a study done by researchers at Kansas State University.
And that's bad news. Not knowing what foods and drinks to skip while you're on Rx drugs can cause serious side effects or lower the effectiveness of your medications.
To stay safe: Get the facts from your doctor and follow up with a 10-minute chat with your pharmacist to learn the ins and outs of your prescription — and what foods and beverages to avoid while you're on it, suggests Lauren Aleksunes, an assistant professor at the Ernest Mario School of Pharmacy at Rutgers University in New Jersey. In the mean
Foods that help the brain produce Dopamine
Top Alkaline Foods to Eat & Acid Foods to Avoid
Interesting article on iron, fortified foods etc
Best Foods and Worst Foods for PD
Surprise, surprise. "When should you start medication therapy for Parkinson's disease?" as per THE PARKINSON'S FOUNDATION. 
