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By Matt McGrath Science reporter, BBC World Service
Researchers say that increasing levels of fatness around the world could have
the same impact on global resources as an extra billion people.
The team estimated the total weight of people on the planet and found that
North America had the highest average.
Although only 6% of the global population live there, it is responsible for
more than a third of the obesity.
The research is published in the journal BMC Public Health.
In their report, the researchers from the London School of Hygiene and Tropical
Medicine calculate the weight of the global population at 287 million tonnes.
They estimate that 15 million tonnes of this mass is due to people being
overweight, and 3.5 million tonnes due to obesity.
Using World Health Organization data from 2005, the scientists worked out that
the average global body weight was 62kg (137lb). But there were huge regional
differences. In North America, the average was 80.7kg (178lb), while in Asia it
was 57.7kg (127lb) .
Start Quote
One of the problems with definitions of obesity - it fosters a them and us
ideal - when actually we're all getting fatter
Prof Ian Roberts London School of Hygiene and Tropical Medicine
While Asia accounts for 61% of the global population, it only accounts for 13%
of the weight of the world due to obesity.
One of the authors of the paper, Prof Ian Roberts, explained the thinking
behind the calculation.
"When people think about environmental sustainability, they immediately focus
on population. Actually, when it comes down to it - it's not how many mouths
there are to feed, it's how much flesh there is on the planet."
Weight of the world
The researchers say that just focussing on obesity is divisive and unhelpful.
"One of the problems with definitions of obesity is that it fosters a 'them and
us' ideal. Actually, we're all getting fatter." Prof Roberts told BBC News.
The scientists also compiled tables of the heaviest and lightest countries
according to their estimates.
The US, with its well documented problems with weight, is top of the list. If
the rest of the world were to emulate the Americans, Prof Roberts says, it
would have dramatic implications for the planet.
Thin Asian lady Japanese people have a low average BMI but high standards of
living.
"If every country in the world had the same level of fatness that we see in the
USA, in weight terms that would be like an extra billion people of world
average body mass," he explained.
While countries like Eritrea, Vietnam and Ethiopia are at the other end of the
scale from the US, the researchers argue it is not sufficient to say that being
skinny is just a factor of poverty. The researchers point to a country like
Japan which, according to Professor Roberts, could be a model for others.
"The Japanese example is quite strong. Average BMI (Body Mass Index) in USA in
2005 was 28.7. In Japan, it was 22. You can be lean without being really poor,
and Japan seems to have pulled that off."
Car culture
But other countries in the top 10 most weighty are more of a surprise, and
include Kuwait, Croatia, Qatar and Egypt.
Prof Roberts says that the high number of Arab countries is due to the impact
of the automobile.
"One of the most important determinants of average body mass index is motor
vehicle gas consumption per capita. So, it is no surprise to see many of the
Arab countries in the list - people eat but they move very little because they
drive everywhere."
The research team hopes its work will prompt new thinking about how the world
weighs up issues of consumption, weight and population growth.
"We often point the finger at poor women in Africa having too many babies,"
says Prof Roberts. "But we've also got to think of this fatness thing; it's
part of the same issue of exceeding our planetary limits."