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Atkins: The diet that spawned anti-carb hysteria, Atkins was all the things carnivores dreamed a diet ever could be: meat and cheese -- all day, every day. With any cultural phenomenon comes a slew of celebrity followers. Kate Hudson, Renee Zellweger, Rihanna, and Calista Flockhart were a few thin starlets who have at one time opted for the sugar-free lifestyle. Though critics have said this does not lend itself to long-lasting maintenance. Take it from Kate -- Atkins leads to Ben & Jerry's binges on the beach. Though for all us normal folk, this isn't balanced out by a four-hour personal Pilates session.