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Measure your breathing, lose weight?

A device which calculates your metabolic rate from the way you breathe may help with diet plans according to its makers.

By measuring how much oxygen has been turned into carbon dioxide in your breath, the Breezing device can work out the speed of the user's metabolism and determine how many calories should be consumed to lose, maintain or gain weight.

But could it really help you diet?

BBC Click's Spencer Kelly finds out more.

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