You’ve seen all the celebrities touting the Jenny Craig Weight Loss Plan: Kirstie Alley, Valerie Bertinelli, Queen Latifah, even basketball star Baron Davis. What is the appeal of this program that attracts heavy hitters to espouse its virtues? Jenny Craig is both a diet and lifestyle program, intent on changing the way you eat, exercise, and live your life. The goal is to change the way you think and act, keeping in mind your overall body health.