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Also a tremendous amount of walking. Japanese urban planning is much more pedestrian friendly than say, almost anywhere in the US.

US has a problem with activity. No sidewalks, go everywhere by car except in a few big cities.

Europe has that, too but we're not that skinny.

But Western European diet "americanized" itself a lot recently. For example in France, some of the staple meals are burgers, tacos[0] and kebab.