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>Japan and Korea both have similar diets to America

I do not think this is true. I don't love the world in data guy, but according to his work, Americans consume way more calories than Japan/Korea [0]

[0]https://ourworldindata.org/food-supply

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This is in reference to the types of foods most commonly consumed by the average adult dailt in Japan and Korea. Dealing heavily in fried foods and high sodium content due to the regionality. It is similar to the Southern portion of the North American Diet the most but with less caloric content. Yet the same heart problems afflicting African Americans effect Koreans and Japanese the difference in survival rates is early detection and preventative measure. Which result in significantly higher life expectancies.

I am pretty sure obesity is a huge difference, unless you are including reducing it as a preventative measure. The diet may be the same but you are going to have way more heart problems at a BMI of 35 than 25. Anybody who has been to both Japan/SK and the South could tell you that there is a massive difference in BMI between the two areas.

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