Here is a chart from Wikimedia, showing the incidence of obesity by country in OECD countries in the period 1996-2003: https://en.wikipedia.org/wiki/Epidemiolo

Here is a chart from Wikimedia, showing the incidence of obesity by country in OECD countries in the period 1996-2003: https://en.wikipedia.org/wiki/Epidemiology_of_obesity#/media/File:Obesity_country_comparison_-_path.svg https://en.wikipedia.org/wiki/Epidemiology_of_obesity#/media... Rates vary from 3.2% (Japan) to 30.6%. The median value is somewhere around 13%. Clearly there is more at work than evolutionary biology/psychology.