Around the turn of the century a large scale study was done to compare the number of cancer deaths between Okinawa, Japan and the U.S. The U.S. had 5.5 times more deaths due to cancer.
Another study showed that the number of deaths between second generation Japanese-Americans and the rest of Americans was basically the same. This proved that the difference in the number of deaths in the first study was not due to genetics. Japanese Americans, when they adopt the U.S. lifestyle, have the same disease rates as the overall U.S. population.
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