Why Did People Start Drinking Cow’s Milk?
We rarely give a second thought to adding a splash of milk to our morning coffee or cereal, but for most of human history, drinking another species’ milk was unusual. Humans couldn’t easily digest animal milk, and species that could reliably supply it were undomesticated. So when — and why — did that change?
You Can’t Milk a Wild Cow
Researchers agree that pinpointing the exact time and place humans began drinking cow’s milk is difficult, but there are some clear milestones. Around 10,000 BCE, humans in the hilly landscapes around modern-day Turkey were evolving from a hunter-gatherer lifestyle to agricultural communities. Part of this transition was the domestication of animals, starting with sheep and goats, and later, around 8000 to 7500 BCE, cattle. Domestication made it easier to manage these animals for meat, hides, and eventually, milk.
Much of what we know about early dairying comes from residues in pottery. Lipid analysis has revealed animal milk fats embedded in shards from the Neolithic Period, roughly 7,000 to 9,000 years ago. Milk was also sometimes mixed with grains, suggesting it was at least incorporated into meals, if not consumed on its own. And as historian Deborah Valenze wrote in 2011’s Milk: A Local and Global History, it’s possible this residue could also have indicated a religious ritual or ceremony rather than consumption.
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The Proof Is in the Plaque
It was dental research, not pottery, that offered scientists the first direct proof that humans consumed cow’s milk. In 2019, researchers at England’s University of York analyzed hardened plaque from Neolithic humans in Britain and found evidence that they consumed milk from cows, sheep, and goats around 6,000 years ago. Other similar studies traced milk consumption through the Bronze Age around 3000 BCE.
Most Neolithic people were, however, lactose intolerant; drinking fresh milk could cause severe stomach issues and illness. So researchers believe the dairy traces may have been from cheese or yogurt, which contain less lactose than fresh milk. Young children naturally produce lactase (the enzyme that breaks down lactose) for several years after weaning from breast milk, so it’s also possible that fresh milk served as an important, calorie-dense food for early childhood survival in early farming communities.
Milk Became a Superpower — for Some
So, did adults also drink fresh cow’s milk? Based on human genetic patterns, researchers think it’s likely. Genetic mutations that allowed adults to digest lactose — called lactase persistence — began appearing around 8,000 years ago, likely because some populations were already drinking fresh milk. The mutations spread most rapidly in Northern Europe, where shorter growing seasons would have made milk a regular and reliable source of calories, protein, and hydration. Cows, in particular, produced higher yields than other domesticated animals, and in regions with cooler climates, milk could stay fresh and more suitable for drinking for longer than it did in warmer regions.
Drinking milk wasn’t just a dietary change — it was part of a much larger shift in human history. Studies show that populations with high milk consumption tended to be taller and heavier, and those who could digest lactose were more likely to survive famines or seasonal crop shortages, giving them an evolutionary edge. Still, the ability to comfortably drink fresh milk as an adult was the exception, not the rule, for thousands of years. In most early societies, milk was processed into cheese or yogurt more often than it was poured, and even today, lactose intolerance remains common in many parts of the world, showing that widespread milk drinking is a relatively recent — and uneven — chapter of human history.
