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scienceDec 5, 201117:59pending

05/12/2011 GMT

Discovery

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When leptin failed to be a wonder solution to obesity, this hormone produced by fat cells, disappeared from the headlines.

Twenty years on scientists now believe leptin is critical to how the body works, regulating appetite, the immune response, inflammation and depression.

Vivienne Parry investigates.

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05/12/2011 GMT

Discovery

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