Can Constipation be a factor in Parkinson's?

http://www.kevinmd.com/blog/2009/12/constipation-sign-early-parkinsons-disease.html
In a study which used intake data to filter for common indicators preceding onset of parkinson's a neurological disorder. Of course a diet which alleviates constipation would be higher in vitamins and fiber which would aid in bowel function and so it may be many issues besides a symptom. Eat your vegetables whole grains and legumes.
try to avoid stress and your digestion may be improved i.e. no constipation. Happy trails.