broader genetic diversity = broader immune system profiles
loads of studies on attraction and mixed race profiles but too racially reductive and again misses the obvious points above, not that Reunion Islanders aren’t stunning or owt
more fully realised picture is human dna seeking breeding matches with genetically diverse populations, unless it’s Gloucester - every population group outside of Africa lessens in genetic/immune system diversity as every population group is a migratory subset of African descent
you’d think Britain as an island would be genetically diverse but our inheritance is essentially comprised of maybe 6-8 migration patterns at scale and nearly all are migratory subsets - western hunter-gatherers, Anatolian farmers, Black-Sea steppe-herders, Spanish-Gaulish-Germanic “celts” (define celts = exactly), Roman Empire’s emigres, Anglo-Saxons, Norse, Norman, Huguenots, New World/slave trade