What Is the Connection Between Diabetes and Parkinson's Disease?

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Is there a connection between diabetes and Parkinson's disease? It definitely looks like diabetes and Parkinson's disease are connected. Patients with diabetes have a third higher risk of developing Parkinson's. How they're connected, isn't really understood, but it may have to do with underlying inflammation or somehow insulin may be connected.

So a third higher it sounds high but what does that translate to the general population? It really doesn't, it's not a huge risk, it's 0.5% for non-diabetics. 0.8% for diabetics.