Tooth plaque shows drinking milk goes back 3,000 years in Mongolia
Milk proteins preserved in tartar show that ancient Mongolians drank cow, yak and sheep milk
WASHINGTON — Ancient people living in what’s now Mongolia drank milk from cows, yaks and sheep — even though, as adults, they couldn’t digest lactose. That finding comes from the humblest of sources: ancient dental plaque.
Modern Mongolians are big on dairy, milking seven different animal species, including cows, yaks and camels. But how far into the past that dairying tradition extends is difficult to glean from the usual archaeological evidence: Nomadic lifestyles mean no kitchen trash heaps preserving ancient pots with lingering traces of milk fats. So molecular anthropologist Christina Warinner and her colleagues turned to the skeletons found in 22 burial mounds belonging to the Deer Stone culture, a people who lived in Mongolia’s eastern steppes around about 1300 B.C.
Ancient Mongolians’ DNA also revealed that they weren’t able to digest lactose as adults. Instead, the Deer Stone people, like modern Mongolians, may have relied on bacteria within the gut, known as the gut microbiome, to break down the lactose, Warinner said.
Warinner’s team had first detected milk proteins in the tooth tartar of European Bronze Age skeletons dating back to 3000 B.C. (SN: 10/14/17; p. 18). The hardened plaque preserves tiny evidence of all sorts of events in a person’s lifetime, from drinking milk to inhaling pollen to working in a dusty artistic working environment (SN: 2/2/19, p. 14).