This article is from the Alternative Medicine Therapies guide.
There are no scientific studies to support any therapeutic claims for colon therapy. On an individual basis, people do report that colon treatments relieve the distention and bloating associated with constipation and help restore regular bowel movements. Anecdotal evidence suggests that colon therapy may be useful for a number of ailments including indigestion, gas, headaches, joint problems, allergies, asthma, skin problems, and even toxicity from drugs, alcohol, and smoking.
As far as general colon health is concerned, some recent reports in the conventional medical literature seem to echo what John Harvey Kellogg preached a century ago--that a high-fat, meat-heavy diet isn't good for the colon. These reports suggest that people who eat a lot of red meat have a higher incidence of colon cancer than the rest of the population. More research in this area still needs to be done, however.