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Except that an American health expert says it's all a pack of lies, actually there's no epidemic and we can all relax and give up the frantic dieting.
Professor Patrick Basham of Johns Hopkins University in Baltimore says there's no evidence that overweight and obesity are significantly increasing. He says that in 1997 the definition of overweight was changed and millions more people were suddenly classed as overweight - although their weight hadn't altered.
In fact the average adult weighs only a pound or two more than a generation ago, and some surveys suggest child obesity is actually declining.
Nor is it true, he says, that being overweight or modestly obese leads to premature death. The increased risk is tiny, as is the number of early deaths.
He claims statistics have been distorted and misread to imply that body-weight has become a widespread problem.
In particular, there's a false assumption that overweight children become overweight adults and overweight adults become obese. But this is not necessarily so.
Furthermore, he says the new obsession with dieting and weight monitoring to control this so-called problem itself leads to serious health risks, eating disorders and body-image hang-ups.
Instead of a campaign against obesity, what we really need is a campaign against thinness and pointless dieting.
His opinions are an astonishing contradiction of the conventional wisdom that assails us from all sides. Can he be right? I hope so. Then we can all calm down and leave our bodies alone.
Size two-zero, anyone?
PS (November 8): Medical researchers in the USA have concluded that a bit of fat actually does you good. Slight overweight in fact makes you 40% less likely then normal weight people to die of a whole range of diseases and risks including cancer, heart disease, emphysema, pneumonia and Alzheimers. In 2004 in the USA there were 100,000 fewer deaths among the overweight than if they had been of normal weight. The researchers were from the Centres for Disease Control and Prevention in Atlanta, Georgia.