Black Americans suffer from high blood pressure twice as high as white Americans. This is also true when comparing Westernized African blacks with African whites. Researchers hypothesize that Westernized blacks suffer from high blood pressure due to two mutual interacted reasons, one is the high salt content of western food; the other is the adaptation mechanism of black genetic genes to the environment.
The statement 'The blood pressure of the descendants of contemporary westernized African black Gambians is usually not high, because Gambians have not been short of salt in history' best supports the researcher's hypothesis.