within 20 percent to 30 percent of the recommended weight

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The normal-weight volunteers, who were mostly students, received $40 a day for participating, Dr. Leibel said. The obese volunteers were not paid but were promised that at the end of the study, the researchers would keep them on a special diet at the clinical center until they no longer were fat. Some spent a year there after the end of the study, Dr. Leibel said. Most reduced to within 20 percent…

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