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My best guess is that you don't have to start over. By the time you get to phase 4, you will be exercising regularly, eating the right things, and most likely your weight will be down. Unless you feel like you need to start again, I would recommend just staying on phase 4. Hope that helps.
He says in the book that if you fall off the wagon any time you can start back at phase one and he also says that if you haven't lost the reached your goal by the end of the ninety days, yes you can start the program over until you reach your goal
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