Countries with low obesity levels show the same trend [1]; just look at e.g. Denmark (18.2%) [2].
[1] https://www.ncbi.nlm.nih.gov/pubmed/10655308 [2] (PDF) http://www.euro.who.int/__data/assets/pdf_file/0006/243294/D...
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The thing to look at wouldn't be the country's current obesity level, but its trend there too.
This suggests an environmental factor or a different dietary one.
Probably not BPA or such, there would be more of a difference between western countries. Plus Asia would show it too. (Heck, they make and use a lot of these plastics.) Not atmospheric pollution either apparently (see French result).
Electromagnetic wave pollution perhaps?
>Probably not BPA or such, there would be more of a difference between western countries.
Why do you say that? Most western countries use plastic and receipts (thermal paper), which are the main sources.
And BPA isn't the only xenoestrogen. PCBs, dioxins, and many agricultural biocides are too.
https://en.wikipedia.org/wiki/Xenoestrogen#Common_environmen...
http://www.sciencedirect.com/topics/neuroscience/xenoestroge...