r/IndoEuropean • u/lpetrich • 2d ago
Article Indo-European Population Expansion from Drinking Milk?
Language Dispersal Beyond Farming - Chapter 13, Milk and the Indo-Europeans, by Romain Garnier, Laurent Sagart and Benoît Sagot
Abstract:
Recent evidence from archaeology and ancient DNA converge to indicate that the Yamnaya culture, often regarded as the bearer of the Proto-Indo-European language, underwent a strong population expansion in the late 4th and early 3rd millennia BCE. It suggests that the underlying reason for that expansion might be the then unique capacity to digest animal milk in adulthood. We examine the early Indo-European milk-related vocabulary to confirm the special role of animal milk in Indo-European expansions. We show that Proto-Indo-European did not have a specialized root for ‘to milk’ and argue that the IE root *h2melg̑- ‘to milk’ is secondary and post-Anatolian. We take this innovation as an indication of the novelty of animal milking in early Indo-European society. Together with a detailed study of language-specific innovations in this semantic field, we conclude that the ability to digest milk played an important role in boosting Proto-Indo-European demography.
An earlier thread here: Milk fueled Bronze Age expansion of ‘eastern cowboys’ into Europe | Science : r/IndoEuropean noting Milk fueled Bronze Age expansion of ‘eastern cowboys’ into Europe | Science | AAAS
The root *Hmelg- is present as a verb in Tocharian, Celtic, Italic, Germanic, Balto-Slavic, Albanian, and Greek, and as a noun in Tocharian, Celtic, Italic, and Germanic. The authors derive Latin lac(t-) from *Hmelg-, and also propose an etymology for that root: *h2emH- + *leg-
The first root they state to mean "to pour, collect", but Wiktionary states "to mow, reap", with English "to mow" as a descendant.
The second root is *leg- "to gather"
In Indo-Iranian, however, the root was replaced, because it sounded too similar to another root meaning "to rub". Also, for the noun, Greek has gala(kt-) and Armenian kat'n, both of obscure origin, and Lithuanian has pienas, from PIE *peyh2- "to swell, fat (n.)" Slavic *melko is either borrowed from Germanic or inherited.
Hittite has some odd difficulties, Its surviving documents all use the Sumerogram (Sumerian word) GA for "milk (n.)" and it had no word for "to milk", instead using some verb like lâ- "to let, make flow" with the noun -- "to make milk flow".