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by Winne Andrews Winne Andrews Thu Feb 3, 9:29 pm ET
PARIS (AFP) A "tsunami of obesity" is unfurling across the world, resulting
in a near-doubling of the numbers of dangerously overweight adults since 1980,
doctors warned on Friday.
More than half a billion men and women -- nearly one in nine of all adults --
are clinically obese, according to research by a team from Imperial College
London, Harvard and the World Health Organisation (WHO).
In 2008, the latest year for which statistics were available, nearly one woman
in seven and one man in 10 were obese, it found.
Being too fat causes three million premature deaths each year from heart
disease, diabetes, cancers and other disorders, according to the WHO.
The researchers described the tableau as "a population emergency."
"(It) will cost tens of millions of preventable deaths unless rapid and
widespread actions are taken by governments and health-care systems worldwide,"
said the report, published by The Lancet.
The problem has been most prevalent in rich nations, rising most in the United
States, followed by New Zealand and Australia for women, and Britain and
Australia for men.
But many developing countries, especially in the Middle East and in rapidly
urbanising areas, are catching up.
"These results suggest that overweight affects one-in-three adults and obesity
affects one-in-nine adults -- a tsunami of obesity that will eventually affect
all regions of the world," Sonia Anand and Salim Yusuf of Canada's McMaster
University wrote in a commentary accompanying the study.
Global obesity rates more than doubled for men, from 4.8 percent of male adults
in 1980 to 9.8 percent in 2008. For women, the corresponding jump was from 7.9
to 13.8 percent.
The standard for assessing weight is the body-mass index (BMI), in which one's
weight in kilos is divided by the square of one's height in metres.
A BMI of 25 to 30 corresponds to being overweight, while above 30 is obese.
Pacific islanders weighed in with the highest BMI levels, between 34 and 35,
and notched up among the sharpest increases over the last three decades as
well.
In Europe, women in Russia and Moldova were at the upper end of the scale with
BMIs of 27.2 and 27.1, while the heftiest men on the continent resided in the
Czech Republic and Ireland.
At the other end of the spectrum, Swiss women were the most svelte, with their
French and Italian counterparts vying for second place.
Italy holds the distinction of being the only country in Europe where women's
average BMI declined, dropping from 25.2 to 24.8.
The study also reported changes in blood pressure and cholesterol levels across
nations.
Western European countries -- especially Iceland, Andorra and Germany -- have
among the highest cholesterol levels in the world, while African nations have
the lowest.
Systolic blood pressure -- the maximum pressure exerted by the heart -- is
highest in the Baltic, and in East and West Africa.
The same levels were common in wealthy nations a generation ago, but have
dropped dramatically since then, the study showed.
High-income countries have also seen a drop in cardiovascular diseases since
1980, despite high levels of obesity.
The United States in particular saw reductions in high blood pressure and
cholesterol levels as well as a slowdown in tobacco use, according to the
study.
This suggests that lifestyle choices -- including limiting consumption of
animal products and sodium, and increasing physical activity -- can play a key
role in slashing heart disease.
Although commonly considered a "Western" problem, obesity is also growing in
unexpected regions like the Middle East, where the average weight levels in
several populations fall just shy of the benchmark for obesity.