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To the Editor: The opportunity to study the effects of refeeding after prolonged fasting is rare. We recorded anthropometric, biochemical, and endocrine changes during the refeeding period after a much-publicized 44-day fast by David Blaine, a performance artist; we compared the findings with results obtained from a control group of 16 age-matched men who had a similar body-mass index (the weight in kilograms divided by the square of the height in meters) after an overnight fast. Blaine ingested only water during his fast. He lost 24.5 kg (25 percent of his original body weight), and his body-mass index dropped from . . .