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Published 20:13 24 Oct 2012 BST
Updated 07:51 18 Dec 2014 GMT

The answer lies in the magic M-word, metabolism. This is the engine in our body that is burning calories constantly. Our metabolism and the rate we burn fat depends on genetics. But age, weight, diet and exercise habits also play a role.
You might be burning fewer calories than your friend or fewer calories than you yourself were a few years ago, but there are easy things you can do to stoke your fat-burning potential.
There is absolutely no reason why you can’t speed up your own metabolism and we have the experts’ simple tips.
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