Parkinson’s disease afflicts almost 12 million people worldwide. And the number of new cases is growing quickly. For roughly 13% of patients, genetics plays a key role. For many others, the underlying cause of the disease might be more mundane and insidious: environmental toxins. Neurologist Dr Michael Okun, co-author of The Parkinson’s Plan, joins CNN Chief Medical Correspondent Dr. Sanjay Gupta to discuss where we stand today in our understanding of this disease, and the “PLAN” moving forward.

Listen to the full episode on CNN's Chasing Life podcast: https://swap.fm/l/clytb120425

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