>Average Japanese diets are much healthier than American diets; there is less of a car culture, public transport is common.
The same can be said about most western Europe countries, yet they still have obesity rates above 20% compared to 4% in Japan.
https://en.wikipedia.org/wiki/List_of_countries_by_obesity_r...
>But do go on about fat shaming being effective.
It looks like the most likely explanation here.