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Feel the Burn

Turning on brown fat in humans may boost weight loss

Bruce Spiegelman isn’t always happy with the way his research gets portrayed. He and colleagues discovered a hormone that muscles make during exercise. When given to mice, the hormone causes the animals to burn more energy and lose weight, and improves their response to insulin — all without changing how much the mice eat or exercise. The press touted the discovery as “exercise in a pill.”

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