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When Did Ancient Humans First Start Drinking Milk? — Transcript

by Drenn · 2,737 words · 489 segments · language en · Watch on YouTube

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0:00Tomorrow morning, you might open the
0:01refrigerator, grab a carton of milk, and
0:04pour it over your cereal, or add a
0:07splash to your coffee. The entire thing
0:09takes 5 seconds, and you probably won't
0:12think about it at all. But, the strange
0:14part isn't that you drink milk, it's
0:16that your adult body may be able to
0:18digest it.
0:20For most of human history, producing
0:22large amounts of lactase throughout
0:24adulthood was not the normal human
0:26condition. In most mammals, including
0:28most humans historically, lactase
0:31production declines after weaning.
0:34That's not a defect, it's the ordinary
0:36shutdown at the end of infancy, repeated
0:39across most of the mammal world. Once
0:41you're no longer nursing, the enzyme
0:43that breaks down milk sugar quietly
0:45winds down, because there's no more milk
0:48expected to come. Humans didn't fully
0:50follow that pattern. At some point,
0:52people started drinking the milk of
0:54other animals, animals they hadn't
0:55nursed from, animals whose milk their
0:57adult bodies weren't necessarily built
0:59to handle easily. And for thousands of
1:02years afterward, biology hadn't caught
1:04up to what people were already doing.
1:06So, here's the real question. When did
1:08people first start drinking milk that
1:09wasn't meant for them? And what did that
1:12decision actually change about how they
1:14lived? To answer that, you have to start
1:16with the animals themselves. Across the
1:19Fertile Crescent, a broad arc of land
1:21running through parts of modern Turkey,
1:23the Levant, Iraq, Syria, and Iran,
1:26people began domesticating goats and
1:28sheep roughly 10 to 11,000 years ago.
1:31Cattle domestication followed within a
1:33broadly similar window. This wasn't one
1:36event in one place. It unfolded
1:38gradually across communities shifting
1:40from following wild herds to keeping and
1:43managing their own animals.
1:45Early herding communities used animals
1:47for meat and other resources.
1:50Dairying introduced a fundamentally
1:52different advantage. A living lactating
1:54animal could provide food repeatedly
1:57without being slaughtered.
1:59Killing an animal gives you one supply
2:01of food once.
2:03A living lactating animal gives you
2:05something that renews itself for as long
2:07as it's kept alive, fed, protected, and
2:11allowed to breed again. That's not a
2:13small difference. It changes what a herd
2:16actually represents to the people
2:17keeping it.
2:18A slaughtered animal is a single
2:20transaction. A milked one is closer to
2:22an ongoing relationship, one that has to
2:25be maintained rather than simply spent.
2:27Maintaining that relationship would have
2:29meant a very different set of daily
2:31demands than raising animals for meat
2:33alone.
2:34A female only produces milk after giving
2:36birth. So, herders would have needed to
2:38think carefully about breeding, about
2:40which females to keep for how long,
2:42about timing offspring so that milk was
2:44available across as much of the year as
2:46possible.
2:47Newborn calves, lambs, and kids still
2:50needed some of that milk themselves. So,
2:52any human use of it likely meant a kind
2:55of negotiation, taking a portion without
2:57taking so much that the young animal
2:58suffered.
3:00None of this required writing,
3:01mathematics, or formal record keeping.
3:04But, it did require the kind of close,
3:06sustained observation that only comes
3:08from living alongside the same animals
3:10for years, watching the same mothers
3:12give birth season after season,
3:14learning which ones produced more and
3:17for longer.
3:18This is also where the herd stops being
3:20a single resource and starts being
3:22infrastructure, something built and
3:24sustained over time rather than
3:25something simply harvested.
3:28Protecting animals from predators,
3:29moving them to find grazing, keeping
3:32them healthy through illness and hard
3:34seasons, all of it now had an additional
3:36purpose beyond eventually providing
3:37meat.
3:39The herd itself had become a kind of
3:40standing investment, and milk was the
3:42return on that investment, collected
3:44again and again rather than once. We
3:46cannot know who first tried drinking
3:48another animal's milk or what exactly
3:51they were thinking when they did.
3:53There's no name attached to this. No
3:55single documented person, no dramatic
3:57accident preserved in the record.
3:59What we can reasonably picture is
4:02something slower and less cinematic.
4:05People already living closely with their
4:07herds, watching young animals nurse,
4:09noticing how much milk a female produced
4:11and for how long.
4:13Perhaps someone tried collecting a
4:14little of it.
4:16Perhaps that happened independently
4:18many times in many households long
4:20before anyone thought to keep containers
4:22specifically for it.
4:24One possibility is that milk use began
4:27almost as an extension of everyday
4:28animal care, not as a separate invention
4:30at all. The archaeological evidence
4:32cannot show us the exact moment this
4:34happened, and it would be a mistake to
4:36invent one. What the evidence can show
4:38us is that once dairying does become
4:40archaeologically visible, it's already
4:42happening in more than one place, among
4:45more than one animal.
4:47By approximately 6,600 to 6,400 BCE,
4:52communities across Anatolia, Upper
4:54Mesopotamia, and the Iranian Zagros were
4:57exploiting and processing milk from
4:59cattle, sheep, and goats.
5:02These are among the earliest secure
5:04direct traces currently known, not proof
5:06of a single point of origin.
5:09No one settlement, no one vessel, no one
5:12population gets to claim the title of
5:14first.
5:15Researchers describe Anatolia and the
5:17Zagros as independent but approximately
5:20synchronous trajectories of early dairy
5:22exploitation, arrived at separately in
5:25different landscapes with different
5:27animals.
5:28In Anatolia, cattle appear to have been
5:30central to the practice. In the Zagros,
5:33sheep and goats seem to have carried
5:35more of that role. That difference
5:37matters. It suggests dairying wasn't a
5:39single technique invented once and
5:41carried outward, but something closer to
5:43a shared pressure meeting different
5:45animals in different terrain in
5:46different places, and arriving at
5:48broadly the same solution. That gap
5:51between the first domestication of these
5:52animals and the first secure evidence of
5:55dairying spans roughly 2,000 years.
5:58That doesn't mean people waited 2,000
6:01years to think of it.
6:02Earlier dairying may simply have left
6:04less behind to find, particularly before
6:07pottery became common enough to trap and
6:10preserve the fats inside it.
6:12A community without pottery could still
6:14have been milking animals. They would
6:16just have had a few ways of leaving
6:17anything a modern chemist could detect
6:19thousands of years later.
6:22Once dairying was underway, it
6:23reorganized daily life around the herd
6:26in ways that killing an animal for meat
6:28never had.
6:29Keeping the animals alive meant
6:31protecting them from predators and
6:32disease,
6:33managing which females were bred and
6:35when,
6:36and timing collection around lactation
6:38itself.
6:40Someone had to gather the milk, hold it
6:42in some kind of container,
6:44and figure out what to do with it before
6:45it spoiled. Because unlike grain, fresh
6:49milk doesn't wait.
6:50We don't know the exact rhythms
6:52different communities settled into,
6:54and it would be wrong to claim a fixed
6:55schedule or a single method every
6:57household followed. But the underlying
6:59shift is clear enough. A herd could now
7:02be a continuing food source, not only a
7:04stockpile of future meat. That
7:07perishability created an obvious
7:09problem. Fresh milk spoils quickly
7:11without refrigeration, and on top of
7:13that, most adults at the time likely
7:15still lost much of their ability to
7:17break down the sugar in it after
7:18childhood. Put those two problems
7:20together, and dairying only makes sense
7:23as a long-term practice if people found
7:24ways around them. Part of the answer may
7:27have been simple tolerance. Reduced
7:29lactase production doesn't mean every
7:31person becomes ill from any contact with
7:34milk. Some adults could likely manage a
7:36modest amount without much trouble. But
7:38another part of the answer there almost
7:40certainly processing. Turning milk into
7:42cheese separates out most of the liquid
7:44whey and lactose dissolves mainly into
7:47that whey rather than staying in the
7:49solid curd. So, a block of cheese can
7:51end up carrying only a fraction of the
7:53sugar in the milk it came from.
7:55Fermenting milk works differently but
7:57toward a similar result since the
7:58microorganisms doing the fermenting feed
8:01on the lactose itself as part of their
8:03own process.
8:04Processing milk into cheese and
8:06fermented products would have reduced
8:07its lactose content this way. Whether or
8:10not early communities understood the
8:11biological reason behind why it helped,
8:14it also would have made part of the
8:15supply last longer and travel further,
8:18turning a fast-spoiling liquid into
8:19something that could be stored or
8:21carried, useful for households facing
8:23lean seasons or needing food that could
8:26survive a journey.
8:28Evidence interpreted as 6th millennium
8:30BCE cheese-making in parts of Europe
8:32shows some communities were already
8:34transforming milk this way.
8:36Though it isn't proof that every
8:37dairying community did the same thing or
8:40that fermentation was deliberately
8:41invented to solve a digestive problem
8:44rather than discovered as a useful side
8:45effect of simply trying to preserve
8:47food.
8:48Some fresh milk may also have been
8:50consumed but the evidence generally
8:52cannot distinguish fresh milk from
8:54processed dairy.
8:56Piece by piece, this turned dairying
8:59into something closer to a small
9:00ecosystem of its own tasks,
9:03breeding decisions made months in
9:05advance,
9:06daily attention to which animals were
9:08lactating,
9:09containers built or chosen specifically
9:12to hold a liquid that didn't keep, and
9:14some portion of each day's yield
9:15transformed into something more durable.
9:18None of this shows up as a single
9:20dramatic invention in the archaeological
9:22record. It shows up as a pattern spread
9:24across sites and centuries of people
9:26quietly building an entire practice
9:28around an animal that used to matter
9:29mainly for its meat. We can trace some
9:31of this directly to individual people,
9:34not just the pots. Researchers
9:36identified dairy fats in ancient pottery
9:38by comparing carbon isotope signatures
9:40preserved in the fat molecules against
9:42known reference ranges, which helps
9:44distinguish milk fat from meat fat.
9:47Pinning down whether that milk came
9:48specifically from cattle, sheep, or
9:51goats usually takes additional protein
9:53or archaeological evidence on top of
9:55that.
9:56Milk proteins preserved in human dental
9:58calculus, the hardened plaque on ancient
10:01teeth, go a step further, showing that a
10:04specific person consumed an
10:06animal-derived dairy product.
10:08In Britain, researchers examined dental
10:10calculus from Neolithic individuals
10:13dating to roughly 3,800
10:16to 3,090 BCE.
10:19At one site, Banbury Lane, milk protein
10:23was detected in one person's dental
10:24calculus.
10:26Separately, none of the three people
10:27genetically analyzed from that same site
10:29carried the derived lactase persistence
10:32allele. Together, these findings offer
10:35site-level evidence of dairy consumption
10:37in a population where the derived
10:39lactase persistence allele was not
10:41detected in the small genetic sample.
10:43Though the protein and genetic results
10:45can't be assigned to the same
10:47individual, and three people are far too
10:50small a sample to prove the allele was
10:52absent across the whole community.
10:54Still, it's a striking snapshot. People
10:57consuming dairy in a place where the
10:59biological tool for easy adult digestion
11:02may have been rare or missing among at
11:05least some of them. That's the real
11:07historical surprise sitting at the
11:08center of this story. Ancient
11:10communities were herding, milking, and
11:13processing dairy for thousands of years
11:15before lactase persistence became common
11:17in some later dairying populations.
11:20Culture moved first. Biology, in the
11:23places where it moved at all, followed
11:24much, much later. Ancient DNA shows just
11:28how long the delay really was.
11:30At Tollense, a Bronze Age battlefield
11:33site in Germany dating to roughly 3,200
11:36years ago, researchers analyzed 14
11:39individuals.
11:40Among them, one carried the principal
11:43European lactase persistence allele,
11:45giving an estimated frequency of
11:47approximately 7.1% in that sampled
11:50population. Not a claim about every
11:52person at Tollense or across Bronze Age
11:55Europe generally.
11:57By the time of that battle, dairying had
11:59existed in Europe for more than 4,000
12:01years. Measured from the earliest secure
12:03Southwest Asian evidence, the gap
12:06exceeded five millennia.
12:08Whatever advantage the allele eventually
12:10offered, it clearly hadn't reshaped the
12:12population carrying it yet.
12:15During the following three millennia,
12:17lactase persistence rose sharply across
12:19parts of Central and Northern Europe,
12:21traceable through later ancient DNA
12:23samples, though it never became
12:25universal across the continent, let
12:27alone across humanity.
12:29And this didn't happen only once.
12:32Lactase persistence evolved
12:34independently multiple times.
12:36Researchers have identified several
12:37African variants that differ from the
12:39principal European one and from each
12:41other, arising separately in different
12:43populations across Africa and the Middle
12:46East.
12:47Different groups herding different
12:48animals in different environments
12:50arrived at a similar biological outcome
12:52through entirely separate genetic paths.
12:55Why the advantage was strong enough to
12:56spread at all remains genuinely debated.
13:00Milk's caloric density is one obvious
13:02candidate, but a major study examining
13:04dairying, disease, and lactase
13:06persistence across Europe found that how
13:08much milk a population historically used
13:11didn't predict the strength of genetic
13:12selection as well as expected, and
13:14pointed instead toward famine and
13:16infectious disease.
13:18In hard times, people who drank milk
13:20despite lacking the allele may have
13:22suffered worse illness and higher
13:24mortality than those who could tolerate
13:26it easily, which if correct means the
13:29allele spread not because milk made
13:31healthy people healthier, but because it
13:33spared some people from a worse outcome
13:35during the worst moments.
13:37This remains one possibility among
13:38others, not a settled conclusion, and it
13:41would be a mistake to compress the story
13:43down to
13:44people drank milk, so the allele spread.
13:48Evolution eventually met some
13:49populations there,
13:51but not humanity as a whole.
13:54For many adults, lactase production
13:56still declines after childhood,
13:58preserving the older human pattern.
14:01So, tomorrow morning, when you open the
14:03refrigerator and pour milk over your
14:05cereal,
14:06remember,
14:08the strange part is not that some adults
14:10struggle to digest it. The strange part
14:12is that any adult can keep digesting its
14:14lactose with ease at all.
14:16>> A bowl of milk sits untouched on a
14:18wooden table 9,000 years ago. The person
14:22who drinks it will likely regret it.
14:23Cramping, bloating, discomfort that
14:26lasts for hours. And yet, generation
14:29after generation, people kept drinking
14:32it anyway. That single, stubborn
14:35decision would go on to rewrite human
14:37DNA.
14:39Most people assume drinking milk is
14:41natural for humans, something we've
14:43always done without complication. That's
14:45wrong. For nearly all of human history,
14:47adults couldn't digest it at all. Every
14:50human infant produces an enzyme called
14:52lactase, which breaks down lactose, the
14:55sugar in milk. But in most mammals,
14:57humans included for most of our
14:59evolutionary past, that enzyme switches
15:02off after weaning. The body simply stops
15:05expecting milk to arrive, which means
15:07for most of the time humans have
15:09existed, drinking milk as an adult meant
15:11discomfort, not nourishment. So, why
15:14does nearly a third of the world's adult
15:16population digest milk easily today?
15:19Around 10,000 years ago in scattered
15:22pockets of Europe and Africa, something
15:24changed. Communities that had
15:26domesticated cattle, sheep, and goats
15:29faced a strange dilemma, an abundant
15:32calorie-rich liquid sitting right in
15:35front of them that their own bodies were
15:36actively rejecting.
15:38Most people who drank it suffered, but a
15:41small number, due to a rare genetic
15:42mutation, did not. Their bodies simply
15:46kept producing lactase into adulthood.
15:48In ordinary circumstances, that mutation
15:50would mean little. But in a famine, a
15:53hard winter, a failed harvest, a person
15:56who could drink milk without becoming
15:57ill had access to food others didn't.
16:01Researchers studying ancient DNA have
16:03found that this mutation spread with
16:05unusual speed, faster than nearly any
16:08other trait ever tracked in the human
16:10genome.
16:11Not because it was dramatic, because it
16:13was the difference between eating and
16:15starving. This is one of the clearest
16:17examples scientists have of culture
16:19reshaping biology in real time. Humans
16:23didn't evolve to drink milk and then
16:24start farming animals.
16:27They started farming animals and their
16:28bodies caught up afterward, one
16:30mutation, one surviving generation at a
16:33time. Even today, the genetic split
16:35tells the story. Populations with long
16:38histories of dairy farming, parts of
16:40northern Europe, certain pastoralist
16:42groups in Africa, show high rates of
16:44lactase persistence. Populations without
16:47that history, across much of Asia and
16:49the Americas, largely don't. Your
16:52ability to drink a glass of milk without
16:53discomfort, in other words, is not
16:55universal human biology. It's a fossil,
16:59a genetic scar left behind by a specific
17:02ancestor in a specific place who chose
17:05to keep drinking something their body
17:06was telling them to refuse,
17:08and survived long enough to pass that
17:10decision down. We tend to think of
17:12evolution as something that happens to
17:15us slowly, invisibly, over eras too vast
17:19to notice.
17:20Milk suggests something stranger, that
17:22sometimes evolution is simply the record
17:25of a choice
17:26repeated by enough desperate stubborn
17:28people for long enough that the body
17:30itself eventually gave in.

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