What Hall discovered, however–and what frankly startled him–was that even when the Biggest Loser contestants gained back some of their weight, their resting metabolism didn’t speed up along with it. Instead, in a cruel twist, it remained low, burning about 700 fewer calories per day than it did before they started losing weight in the first place. “When people see the slowing metabolism numbers,” says Hall, “their eyes bulge like, How is that even possible?”
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