Rather bizarre study here http://www.bbc.co.uk/news/health-18462985 measuring average weight of nations (doesn't seem to take height into account) and concluding that overweight accounts for the equivalent of 1 billion extra people on the planet. But there is a very interesting point near the end.
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."
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