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A class of complex carbohydrates, dietary fibre is found in many plant foods such as beans, bran flakes, brown rice, fruits, psyllium seeds, vegetables and whole grains. It comes in several forms, including cellulose, hemicellulose and lignin - which are insoluble in water and pectin, gums and mucilages - which are water-soluble, gel-forming fibres.
Fibre adds bulk to the diet, thereby increasing stool weight and promoting bulky and speedy bowel movements. See 'Fibre, Medical uses'
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