Gym-free Mireille Guiliano, author of 'French Women Don't Get Fat'

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Also, Mireille says French women do not live by the scale. "We're not obsessed, like many American women," she says. "We don't go on the scale every morning. If you've overeaten, your pants are going to be tight."

The French attitude to exercise is also different from America. They don't go to gyms! "I prefer to walk everywhere," she says. "In France we have a saying, joie de vivre, which actually doesn't exist in the English language. It means looking at your life as something that is to be taken with great pleasure and enjoy it."