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Researchers predict that if all people had the same average body mass index as Americans, the total human biomass would increase by 58 million tonnes.
Figures show that while the average global weight per person is 62kg in 2005, Britons weighed 75kg. In the US, the average adult weighed 81kg.
Across Europe, the average weight was 70.8kg compared to just 57.7kg in Asia.
More than half of people living in Europe are overweight (55.6%) compared to only 24.2% of Asian people. Almost three-quarters of people living in north America were overweight.
Scientists from the London School of Hygiene and Tropical Medicine say that tackling population weight is crucial for food security and ecological sustainability, otherwise it will have the same impact as adding an extra billion people to the planet.
- The world's adult population weighs 287 million tonnes
- 15 million of which is due to being overweight
- 3.5 million is due to obesity
Data: BMC Public Health