Parkinson's disease may start in the gut and travel to the brain

It seems the nerve damage behind Parkinson's starts in the stomach or colon before spreading to brain cells - but we don't know what's causing it

Have we been thinking about Parkinson’s disease all wrong? The condition may arise from damage to the gut, not the brain.

If the idea is correct, it opens the door to new ways of treating the disease before symptoms occur. 

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