It's a debate that has rumbled on for a decade – and is at the very heart of our understanding of what makes us fat.On one side, a group of diet experts who argue that our ever-more sedentary lifestyles are to blame for our spiralling obesity rates.They say inactivity is so hugely damaging to health, leading to weight gain that increases the risk of everything from heart disease and to many cancers, it's on a par with tobacco. 'Sitting is the new smoking,' they claim.
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