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Liquids employed in colonics may include coffee, herbs, enzymes, wheatgrass extract, or lots of other substances. Devotees of the process publicize that "all illness and death begin in the colon," that colonics "detoxifies" the body, and that regular "cleansing" is critical to maintain one's health. None of these claims are true. The assumption that all illness and death begin in the bowel is one of the oldest health misunderstandings known to humankind. The traditional Egyptians associated feces with rot, and rot with death.

http://www.captaincolon.com/Colon_FAQ.html