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what is brown, yellow, and green poo?
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Faeces are composed of materials that were not digested or absorbed, with water, electrolytes, mucus, and bacteria. Usually the faeces are about 75% water.
The colour of our faeces comes from a substance in bile. Bile is yellow, olive-green, or brownish. The bile pigment results from the breakdown of old red blood cells. Bacteria in the colon decompose the bile pigments to create a brown colour. Without the bacteria, our faeces would be the various colours of bile -- yellow, olive-green, or brownish. In other words, their colour derives from bile pigments altered by bacteria action.
The pungent odour of the faeces results from a variety of compounds that bacteria produce. These compounds include phenol, hydrogen sulphide, indole, skatole, and ammonia.
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