Any individual’s death is caused by a number of interrelated factors - for example, death by stroke could be caused by high blood pressure, smoking and being overweight.
But using statistics, scientists are able to tease out one factor from the other to give estimates of how many people die from one particular cause.
Using this method, they believe being obese has risen from the 10th most important risk factor for death in 1990, to the sixth. More than three million now die from having a ‘high body mass index’ , an 82 per cent increase.
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