The only known adults in the world who possess a rare genetic mutation that prevents their bodies from producing leptin may open the door to a new way of fighting fat. After injections with leptin -- a human hormone linked to appetite control -- the adults' dramatic weight loss suggests that leptin offers significant promise for treating obesity. Dr. Julio Licinio, professor of medicine at the David Geffen School of Medicine at UCLA, flew three cousins -- two women and one man -- from a tiny village in Turkey to UCLA Medical Center last September for clinical research treatment with leptin. Ranging in age from the late 20s to 40, all of the cousins were severely obese and one was still prepubescent.
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