Could Parkinson's disease start in the gut? -- ScienceDaily

 Parkinson's disease may start in the gut and spread to the brain via the vagus nerve, according to a study published in the April 26, 2017, online issue of Neurology®, the medical journal of the American Academy of Neurology. The vagus nerve extends from the brainstem to the abdomen and controls unconscious body processes like heart rate and food digestion.

Here's the paper:

Vagotomy and Parkinson disease

A Swedish register–based matched-cohort study

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