Look to the gut:
‘In 1817, English surgeon James Parkinson reported that some patients with a condition he referred to as ‘shaking palsy’ suffered from constipation. The disease has been named after him ever since and in one of the six cases he described, helping to alleviate that patient’s gastrointestinal complaints also helped some with the movement-related problems of the very same patient.
In fact, today, new evidence is pointing to the stomach and gastrointestinal tract as a possible solution—or, at least, part of one—for those suffering from the disease.
Just over half of all Parkinson’s patients have constipation as one of the common symptoms of the disease….’
Via Big Think