It is a stark reality that Brits are amongst the fattest in Western Europe, with around two in three adults overweight or obese and the NHS spending billions of pounds a year on obesity related ill-health. But could a glimmer of hope be on the horizon? A 'game-changing' new weight-loss drug is set to be made available on the NHS later this year after participants on a global trial lost almost two and a half stone on average. But are we pinning too much hope on one medical solution? Deborah Cohen explores the new tools in Britain's battle with obesity.