"Holistic practitioners believe the colon is a sewage system and if it's not kept clean, waste products won't be cleared out and toxic substances will be absorbed into the body. They believe that the typical person may have as many as several pounds of fecal matter in their colon, which causes mucus to build up and harden on colon walls. Science says this is not true. Your colon knows how to do its job, constantly shedding old cells, absorbing nutrients and keeping a delicate balance of bacteria and natural chemicals. Interfering with this process can hurt or destroy these relationships, meaning the colon won't work as well as it should. Colon cleansing is unnecessary, and medical doctors do not advise you to do this." Article by Melissa Tennen, Health A to Z (16th August 2005)