Scientists at the University of Chicago claim to have found genetic evidence to support the sodium-retention hypothesis, revealing that the frequency of one version of a gene that plays a crucial role in salt retention correlates with distance from the equator.
“The surprise was finding that as populations moved away from the tropics the original or normal version of the gene became less and less common and the 'broken' version more frequent, which suggests it is protective,” said study author Anna Di Rienzo, associate professor of human genetics at the University of Chicago.
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