Some still consider fasting -- in any form -- to be "out there." "When I review diets that are not based on science, the question I ask myself is: Would I feed them to my family? In this case, the answer is a clear no," says Susan Roberts, PhD, chief of the Energy Metabolism Laboratory at the Jean Mayer USDA Human Nutrition Research Center on Aging and a professor of nutrition at Tufts University in Boston.

In the book Triumph Over Disease, Jack Goldstein, DPM, outlines his true story in overcoming ulcerative colitis by sticking to strict water fasting and a vegetarian diet. Goldstein is one of very few people who has tested his own tongue scrapings, urine, feces, even perspiration during a water fast, Strychacz says. "He found that the contents [during a fast] are different than normal -- that toxins like DDT do get removed."
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