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"Physicians should be aware that lifestyle changes actually do work. . . [and] they could refer people to this or another program and be optimistic [that although] this is not a magic bullet, people have to adhere," said Cheryl Rock, lead author of the Jenny Craig study, which appears with the other study in the Oct. 27 issue of the Journal of the American Medical Association. Rock reported being on the Jenny Craig advisory board in 2003 and 2004.