White rice and D2 in Japan

http://m.ajcn.nutrition.org/content/92/6/1468.full.pdf

Is it another senseless observational study?
Look at the data
http://www.who.int/diabetes/country-profiles/en/#J

And by chance we have another observational study about rice and CRC which does not say the same numbers...
http://www.nature.com/bjc/journal/v110/n5/full/bjc2013799a.html
especially here:
http://www.nature.com/bjc/journal/v110/n5/fig_tab/bjc2013799t1.html#figure-title