It's low in calories with one cup amounting to only 15 calories. Vegetables contain dietary fiber, often called roughage.
Cabbage contains insoluble fiber in the form of cellulose.
It is not digested by humans and does not dissolve in water. Research suggests that this insoluble fiber increases bulk and speeds up the movement of body wastes though the intestines and the colon. The outer leaves of cabbage are nutrient-rich, so choose a head without loose or wilting outer leaves that would be discarded. Look for a solid, compact head that is heavy for its size and shows no discoloration. Cabbage keeps best when wrapped in plastic and placed in the refrigerator crisper.