Martha Stewart — Martha Stewart Living Omnimedia from Women Who Rock the Food World Slideshow

Women Who Rock the Food World Slideshow

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Jenny Craig — Jenny Craig

Jenny Craig founded her weight loss company with the help of her husband Sidney, in Melbourne, Australia, in 1983. The New Orleans native moved the company's headquarters to the Carlsbad, Calif., two years later. There are currently more than 725 Jenny Craig locations around the world, and the company has expanded to offer a wide variety of prepared meals, cookbooks, and supporting merchandise. Nestlé bought Jenny Craig, Inc. in 2006.