I've been recently diagnosed and have posted about it here a few days ago. I'm just taking Azilect 1mg/day and green tea extract.

After recovering from a "why me?" feeling, my 2nd question was "why at 45?" and I think I've come to conclusions similar to yours Max19BC: "poor diet, lack of exercise, lots of stress".

And though I think medication is working, I do believe an important part of my current improvement is due to two main factors: exercise (walking 1hour 6 days/week, pilates once a week) and a change towards a positive attitude.

I have clearly identified that my PD symptoms worsen whenever I'm stressed at work and whenever I don't sleep well. When I think about it I realize that I now become stressed much more easily than a few years ago, so maybe stress is a PD cause that has turned into a PD symptom. This is currently my biggest challenge: to become emotionally detached from work (without medication, of course), so that it doesn't affect my PD condition.

Conclusion; I also believe that I can beat PD and will keep doing my best to stay optimistic about it.