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1. Anything in the diet, e.g., bran, serving as a bulk stimulant of intestinal peristalsis.

2. Hay or other coarse feed fed to cattle and other herbivores. Coarse food high in fiber but low in nutrients; its bulk stimulates peristalsis.Indigestible materials that are part of a healthy diet to promote the action within the intestines to prevent constipation. This is the case because the roughage is recognised by the body as indigestible, and therefore will always want to remove it, and c.