Erin O'Hara: naturopath and wellness expert on the increased growth of Parkinson's disease - The Sunday Session with Francesca Rudkin

As the world's population get older, there's growing concern about increased rates of Parkinson's disease.

From 1990 to 2015, the number of people with Parkinson disease doubled to over 6 million - and the number is predicted to double again by 2040.

Naturopath and wellness expert Erin O'Hara says it's unclear why these rates have gone up - but there are plenty of environmental factors believed to influence the condition. 

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