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The most abundant substance found in the plant kingdom. Cellulose is a fibrous form of complex carbohydrate, both indigestible and insoluble in water. However, it has the ability to bind with water and increase stool mass and weight, promoting bowel movement and elimination.
Moreover, it speeds-up stool transit time, (i.e.) the time needed for food to travel from mouth to anus. Thus, it helps tp prevent severe colon conditions suchas cancer of the colon, constipation and diverticulitis. Small parts of cellulose ferment and degrade in the colon, and this degradation produces 'short chain fatty acids' which are important for the energy metabolism of the colon.
A major source of cellulose is wheat bran. For further reading see 'Nutrients A to Z' by Dr, Michael Sharon (Prion Books)