If sales of diet books and enrollment in weight-loss programs are any indication, most of the more than 70 million Americans who are overweight are trying to slim down. But, the American Medical Association warns, weight-watchers should reduce with care. According to the A.M.A., two currently popular quick-loss plans offer more risks than lasting rewards.
One of the A.M.A.'s concerns is the treatment offered by Simeons Weight Clinics, a chain of "fat clubs" with branches throughout the U.S. The A.M.A. notes that Simeons clients are placed on a diet of 500 calories a day for 42 to 60 days. They are also...