Definition of roughage
: mostly indigestible material in food (such as legumes, whole grains, and vegetables) that promotes elimination of waste from the large intestine : fiber sense 1d Knowing where to get dietary fiber is important because strong evidence now links roughage to good health, weight management and a reduced risk of colon cancer and other major diseases.— Elizabeth Somer also : food containing much indigestible material acting as fiber That's okay, though: Junk food has a place in a moviegoing diet, as long as you make room for roughage elsewhere. — Ty Burr
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