Thank goodness for all those countries that are neither the US nor puely non-capitalist (not that the US is an example of a pure capitalist society).
Just how blinkered is American Exceptionalism anyway? Surely you're knowingly playing up the false { US | not-US } dichotomy.
eg: "American junk food" as seen in the US is largely regulated away in Australia, food labelling is better, overall health and life expectancy is better, etc.
I don't know enough about other countries to comment on them in detail.
I do know that food multinationals are very active in almost all countries, and that obesity rates have skyrocketed in almost all countries, except for Japan, S Korea, and poor countries where people literally don't have enough to eat.
In Australia the obesity rate is >32%. That must be junk-food companies at work - I'm not aware of any other explanation.