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2 formerly obese economists who lost a combined 120 pounds in 18 months relied on a controversial weight-loss strategy

The way Christopher Payne sees it, when you're trying to lose weight, "you're basically a scientist of your own body." Payne and Rob Barnett wrote the book "The Economists' Diet: The Surprising Formula for Losing Weight and Keeping It Off," in which they explain how to use fundamental economic principles to shed pounds the way they did.