Regarding “Constipation might signal Parkinson’s,” did anyone consider that the patients’ diet might be the reason for constipation and the Parkinson’s disease? Your article reads as if diet can’t affect constipation. Mark Bremer
Benicia, Calif.

The researchers accounted for smoking, coffee consumption, laxative use, jogging, and intake of fruits, vegetables, and grains. –N. Seppa