Digestive System

Why are faeces brown?

Answer

Wiki User
07/17/2011

Bile pigment bilirubin a waste product of the breakdown of erythrocytes, is altered by microbes in the large intestine, resulting in urobilinogen, this is then converted to STERCOBILIN which is responsible for the brown colour and deodorisation of faeces.
The brown coloration of faeces comes from a combination of bile and bilirubin, which comes from dead red blood cells.