The 'civilised' world is getter fatter. is this because we have instant access to cheap, calorie-laden food or are some individuals genetically programmed to need to eat more?
Timothy Frayling, Professor of Human Genetics at the University of Exeter thinks that genetic factors are the main driver for obesity in today's environment.
But John Wilding, Professor of Medicine at the University of Liverpool believes that changes in our environment are responsible for increasing obesity.
Could they both be correct?
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