I'll start with colonics...:
Today we understand more clearly the importance of dietary fiber, hydration, and so forth. Medical scientists also know that these have nothing to do with intestinal toxicity. Early in this century a medical researcher produced all of the symptoms of constipation (dry mouth, lethargy, etc) by packing the rectum with sterile cotton. Studies done in the 1920s found that "high colonic irrigations" were useless and did not even reach very high even when fairly long tubes were employed . Studies in the 1930s found that colonic irrigation was contraindicated for treating ulcerative colitis, an intestinal disorder which did permit bacterial contamination of body through the gut wall. In 1985, the Infectious Disease Branch of the California Department of Health Services stated:
Neither physicians nor chiropractors should be performing colonic irrigations. We are not aware of any scientifically proven health benefit of this procedure, yet we are well aware of its hazards." 
The hazards include illness and death by contamination of colonics equipment  and death by electrolyte depletion [5,6]. In addition to the physiological upsets, colonic apparatus can also perforate the intestinal wall leading to septicemia (bacterial contamination of the blood), a very serious disorder.
Colonic irrigation should be considered a health fetish. The ideas of "cleansing" and "detoxification" have no physiological significance, but they do have emotional meaning to people who believe themselves to be "unclean" or "impure" in some way. Just as the ancient Egyptians did, health neurotics may temporarily relieve their health anxieties by colonics, laxatives, and purges.
From the National Council Against Health Fraud; great motto: "Enhancing Freedom of Choice through Reliable Health Information."
Any other contributors?
Disclaimer: This post is meant to stir up a scandal. If you don't want to debate, stay out.