Human digestive waste is made up of 75 % water and 25 % solid matter.
Waste Material Solid % Water %
Dead Bacteraia 30 %
Indigestible food 30 % (Cellulose)
Cholesterol & Fats 10-20 %
Inorganic substances 10-20 % (calcium phosphate and iron phosphate)
Protein 2-3 %
Other products of human waste are cell debris of the mucous membrane of the intestinal tract also passes in the waste material, Bile pigments (bilirubin) and dead leukocytes (white blood cells). The brown colour of waste is due to the action of bacteria on bilirubin. The odour of waste is caused by the chemicals which are produced by bacterial action.
