Black Americans are twice as likely to suffer from high blood pressure as white Americans  The same is true of the comparison between westernized black Africans and African whites
The blood pressure of Senegalese and Gambian descendants is usually not high and there has been no shortage of salt in the history of Senegal and Gambia.
 The researchers hypothesized that the reason why westernized blacks suffer from high blood pressure is the interaction of two reasons: one is the high salt content of western food, and the other is the genetic adaptation mechanism of blacks to salt-deficient environment