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As a counterpoint, Japanese people generally eat almost the inverse of the keto diet (high-carb, low-fat[1]) and have the longest life expectancy on the planet.

It's just not as simple as "this diet" vs. "that diet".

[1] https://www.huffingtonpost.com/entry/japan-healthiest-people... [2] https://en.wikipedia.org/wiki/List_of_countries_by_life_expe...

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One interesting thing to note is that much of this comes from Okinawans in particular, and there's a possible link to a purple sweet potato they consume a lot of (or at least used to). You can get them at most asian grocery stores and they're quite tasty (but not especially keto friendly).

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