Shiver your timbers - and you may get thinner

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Feeling fat? Lift your right arm, stretch it as far as you can... And turn the fire down.

Scientists think shivering may be as good as exercise at producing calorie-burning “brown fat” - the opposite of white fat. Sheffield’s obese 60 per cent are advised not to munch on a muffin to cheer themselves up as they shudder.