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Science

Researchers Baffled as Warrior Skeletons Reveal Bronze Age Europeans Couldn't Drink Milk (sciencemag.org) 192

sciencehabit quotes Science magazine: About 3000 years ago, thousands of warriors fought on the banks of the Tollense river in northern Germany. They wielded weapons of wood, stone, and bronze to deadly effect: Over the past decade, archaeologists have unearthed the skeletal remains of hundreds of people buried in marshy soil. It's one of the largest prehistoric conflicts ever discovered. Now, genetic testing of the skeletons reveals the homelands of the warriors—and unearths a shocker about early European diets: These soldiers couldn't digest fresh milk...

The results leave scientists more puzzled than ever about exactly when and why Europeans began to drink milk. "Natural genetic drift can't explain it, and there's no evidence that it was population turnover either," says Christina Warinner, a geneticist at Harvard University and the Max Planck Institute for the Science of Human History who was not involved with the study. "It's almost embarrassing that this is the strongest example of selection we have and we can't really explain it."

Perhaps something about fresh milk helped people ward off disease in the increasingly crowded and pathogen-ridden European towns and villages of the Iron Age and Roman period, says the study's co-author. But he admits he's baffled too. "We have to find a reason why you need this drink."

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Researchers Baffled as Warrior Skeletons Reveal Bronze Age Europeans Couldn't Drink Milk

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  • Not a mystery (Score:5, Insightful)

    by locater16 ( 2326718 ) on Sunday September 06, 2020 @12:42AM (#60478126)
    Milk isn't some mysterious benefit. It's full of vitamins, protein, and calories. You get it for cheap if you've got herds of milk giving animals, especially cattle, anyway. You can store if longer as butter and even longer as cheese. Sheer profit for anyone facing starvation that doesn't have lactose intolerance.
    • Perhaps when the lactose-intolerant had to drink milk for some reason and started blowing up like carnival balloons they spent most of their time with diarrhea and just stayed home, thus providing an evolutionary benefit with protection from disease simply by isolation.
    • by raymorris ( 2726007 ) on Sunday September 06, 2020 @01:47AM (#60478200) Journal

      There benefit of being able to digest milk is clear.

      I think what they find surprising is that "Europeans" couldn't digest milk at this particular time, then 1000-2000 years later they could.

      The summary notes that all of the specimens have similar DNA, they seem to be from the same ethnic group. It is therefore possible that all of the ones they tested for this particular gene were the army of a particular group. Likely a group ruled not by a liberal democracy, but by a ruling family. It seems that the ruling family, whose genes were prevalent in society and in the soldiers, were often lactose intolerant. From that, the article assumes that "Europeans" were lactose intolerant.

      The United States is kinda a strange country, historically, in that it's not based around an ethnic group or a thousand years of shared history. France is 77% French people (ethnic French), Germany is over 80% people, Japan is 98% ethnic Japanese people.

      Even today, looking at the DNA of some Japanese people and generalizing to "Asians" would be highly incorrect. You can test Swedish people and say "Europeans", even after 5000 years of mixing since this battle. It's entirely possible that the DNA of this particular clan / tribe / group doesn't represent "Europeans".

      • France is 77% French people (ethnic French)

        That's a common misrepresentation of the statistics.

        A 88.4% chunk of the French population is counted as "natural born citizens", a 9.7% chunk is counted as "immigrants", 7.1% chunk is counted as "Foreign nationals", the remainder is counted as "French by acquisition". Split along the "ethnic group", that becomes (rounded) 85% "white of European origin", 10% "north African", 3.5% "African" and 1.5% "Asian".

        One big issue for ethnic statistics is that it is illegal to poll for for ethnic origin in France, as it is considered a protected class under the data protection law of 1978. One of the last officious ethnic group census (2004) placed the "ethnic French" group at 55% of the French population. That may even be a bit too high now as it was taken 16 years ago, but it's close enough to what I see around me.

        • by AmiMoJo ( 196126 )

          What actually is "ethnic French"? Say your great grandparents were German and your family moved to France, as has not been uncommon for thousands of years on a continent with land borders and regularly shifting political boundaries. Are you "ethnic French" or Germanic or something else?

          • > Say your great grandparents were German and your family moved to France... Are you "ethnic French" or Germanic or something else?

            That's German DNA, not French. Although France was actually a bad example. For the purposes of those numbers, it means at least one of your parents is French, recursively. I should have said Portugal, Norway, or Spain.

            The US is called the melting pot because other countries generally aren't as much; Greek people look different from Irish people and have distinctly different

      • by WierdUncle ( 6807634 ) on Sunday September 06, 2020 @06:22AM (#60478526)

        It should be pointed out that the ability to digest milk as an adult is a freak adaptation. I am not sure that most non-domesticated mammals can digest milk as adults. For example, I have read that putting out a saucer of milk to feed hedgehogs does not do them any good. It just gives them the shits. But household cats are OK drinking milk.

        There is a theory that some domesticated animals are infantilised by deliberate selection by humans. With many breeds of dog, the snout is shorter than it is in wolves, and they have floppy ears, like puppies. The interesting point is that humans have done the same thing to themselves. A community of domesticated humans is called a civilisation.

        Lactose tolerance must be a fairly recent genetic adaptation, because the benefit of it depends on the domestication of milk-producing animals such as cows and goats. So it is maybe only a few thousand years old. There would certainly be human populations without this adaptation, if their living did not depend on domesticated livestock.

        • Re: (Score:3, Informative)

          by Anonymous Coward

          But household cats are OK drinking milk.

          No.
          It's not toxic to them but many cats are lactose intolerant and it can give them a stomach upset.

        • by ceoyoyo ( 59147 )

          It's not a "freak" adaptation. It's an adaptation.

          Humans are a species that domesticates other species. The ability to use the nutrient syrup those species produce is a survival advantage. It's probably particularly advantageous in climates where you can't grow food all year round and may not have access to the sea; places like northern and inland Europe, and central Asia.

      • by ceoyoyo ( 59147 )

        Or that it mostly does but some little group somewhere could digest milk and proceeded to wipe these guys out.

    • Sheer profit for anyone facing starvation that doesn't have lactose intolerance.

      Its not just lactose that you can be intolerant to. You can be intolerant to some of the proteins, although this is more common in children.

    • Re:Not a mystery (Score:5, Informative)

      by Darinbob ( 1142669 ) on Sunday September 06, 2020 @02:00AM (#60478214)

      That's not what the story is about. We know the benefits of milk. We also know that Europeans drink milk and can digest it easily, whereas in other parts of the world milk drinking is rare and lactose intolerance is very common. The mystery here is that this discovery shows that the gene selection for milk drinking in adult europeans happened a lot more recently than it was assumed, and why it happened.

    • AS we are the only mammals to continue drinking milk after being weened, its not surprising we are not really suited to drinking milk in adulthood. i know that drinking a glass of milk as adult really makes my stomach feel uncomfortable and cheese gives me a blocked nose (still each cheese though).
      • Re:Not a mystery (Score:5, Interesting)

        by Luckyo ( 1726890 ) on Sunday September 06, 2020 @03:09AM (#60478306)

        Weaning is probably the key point here. European humans likely never were weaned, and as a result, never lost their ability to digest lactose. You can maintain production of relevant enzymes in many animals by simply keeping giving them milk throughout their lives. It's how many cats do become lactose intolerant if you stop giving them milk after they are weaned from cat milk that comes from the mother, but there are a lot of cats who aren't in today's world. Because they get things like cow's milk, cream and so on. Essentially losing ability to digest lactose is an resource conservation process of digestive tract as a consequence of lack of need for the extra enzymes. If you keep drinking milk, you have a good chance of digestive tract never dropping its ability to produce relevant enzymes, because the need is constant.

        And this trend of keeping getting milk would be a natural consequence of the specific kind of domesticated cattle that became prevalent in Europe once certain level of tribal warfare pacification, agricultural progress and cultural advancement was achieved in society.

        • This is an interesting theory, but it would NOT show up in the genes of long dead people.
          • by Luckyo ( 1726890 )

            That's because neither genes nor "genetic relevance of long dead people" are of high relevance to the question being posed. There are two fairly common misunderstandings in the whole "genetics in people long since dead in relation to us" that are false:

            Fist one is that genes are the sole variable in lactose intolerance. They are not. Cessation of production of relevant enzymes occurs both as a function of genetics and termination of enzyme generation due to lack of relevant environmental input. Remind yours

        • It doesnt work, like that. Weaning in animals occurs when drinking their mothers milk gives them stomach ache/bloating/diarrhoea so they stop. No reason humans should have been any different.

          • by Luckyo ( 1726890 )

            You confuse cause and effect. Lactose intolerance in animals develops as a response to reduction of milk input. It's why many cats and dogs who are kept on milk based diet never stop producing relevant enzyme.

            This is not to say that it won't occur on its own with time. In many animals, it does. But expression of generation of relevant enzymes is regulated at least in part by input of lactose into digestive tract.

            Your misconception is fairly common though, and is one of the reasons why people give cats milk,

          • Re: (Score:3, Interesting)

            Weaning in animals occurs when drinking their mothers milk gives them stomach ache/bloating/diarrhoea so they stop.

            Nope. Parents wean the child.
            The child will gladly keep on drinking in perpetuity.
            Luckyo is in fact correct that lactose intolerance has 2 facets: genetic, and intestinal resource optimization.
            All mammals are born lactose tolerant. Those without genes that cause lactase production to never stop will stop producing lactase once they cease drinking milk. Those with genes that cause lactase production to never stop will continue to produce lactase, even if they stop drinking milk.

            • So if someone stops eating starch for a few weeks amylase production stops and doesnt restart? Ditto protein and pepsin production? Didnt think so. Sounds like BS to me.

              • That's the dumbest fucking argument I've ever seen.

                First off, pepsin and amylase are proteins. All enzymes are. Your body wouldn't be able to construct them otherwise, so the statement "Ditto protein and pepsin production?" already outs you as having no idea what you're talking about. But let's not let that stop us from exploring your brilliant hypothesis.

                "So if someone steps on a cow, it dies? Ditto an elephant and a giraffe? Didn't think so. Sounds like BS to me."
                Yet if I step on a mouse, it's dead a
        • Long ago, I read some evolutionary biology stuff about a phenomenon called "neotony". This is where adult animals continue to show childish traits and behaviours. In humans, one example is the continued capacity for play. In most mammals, childhood play is perhaps a kind of training for adult life, and may establish social bonds. But after that there is no need for it. In humans, there are many playful activities in adult life. I suppose my posting here is a form of play, because I am certainly not going to

      • by GeLeTo ( 527660 )
        Actually most europeans have evolved genes that let them digest milk in adulthood. This happened very quickly a few thousand years ago, so there must be a big evolutionary advantage to drinking milk. So "not really suited to drinking milk in adulthood" is incorrect, mother nature has taken care of me being able to drink a few glasses of milk and feel great.
        • Actually most europeans have evolved genes that let them digest milk in adulthood.

          Just barely. 60.1% of non-Finnish Europeans have an MCM6 variant that doesn't ever deactivate LCT (57% for the Fins)
          The other 30% or so Europeans that have no trouble with milk simply have environmental lactose tolerance- they never ceased drinking milk in their life (Americans are the same way)

          so there must be a big evolutionary advantage to drinking milk.

          No, evolution doesn't work that way.

          • by GeLeTo ( 527660 )

            No, evolution doesn't work that way.

            So getting from almost nobody being able to drink milk to most of the population (yes, 60% means most) being able to drink it, in the span of a few thousand years somehow has nothing to do with evolution and drinking milk being evolutionary advantageous?

            • So getting from almost nobody being able to drink milk to most of the population (yes, 60% means most) being able to drink it, in the span of a few thousand years somehow has nothing to do with evolution and drinking milk being evolutionary advantageous?

              Who knows.

              so there must be a big evolutionary advantage to drinking milk.

              But that's still false.
              There *could* be, for sure. There could just as easily *not* be.
              I'll present the most obvious scenario:

              All human populations that drink a lot of milk have higher rates of lactose tolerant MCM6 modifications.
              Genes often lose function if they're no longer needed, and it can happen quite quickly.
              MCM6 has evolved to stop production of lactase via LCT gene once it's no longer needed. To keep producing it in a non-milk drinking society would be a literal waste of body resour

    • You missed the point of the article. They mystery is how come Lactase Persistence in Germany went from 0 to over 80% in 3000 years without it being a new population. Its not natural selection as there wasn't a crisis that caused non-milk drinkers to be less fertile.

      • Its not natural selection as there wasn't a crisis that caused non-milk drinkers to be less fertile.

        How sure are you about that?

        Widespread starvation in the winter months was likely quite common in Northern Europe. Cows would be kept alive to calve in the spring time, so milk would have been available. Apart from fish (not often found inland when there is ice on the top of the rivers/lakes) what other sources of protein were there?

        • Most starvation was in the late Spring/early Summer just before you could harvest wheat for bread. Remember, potatoes didn't come until the 1500s.

          Cows that are calving in the spring stop giving milk in the Autumn.

          So there are 2 factual problems with your theory.

      • Re: Not a mystery (Score:2, Interesting)

        by Wycliffe ( 116160 )

        Milk has some major advantages. Besides being calorie dense, itâ(TM)s a good source of vitamin D especially in the winter. Combine that with the fact that potatoes and grains are low in vitamin D as well, itâ(TM)s likely that as humans transitioned to agriculture that preventing rickets was a major natural selection in favor of milk drinkers. Humans likely didnâ(TM)t even know that switching to grains was killing them and drinking milk was saving them but along with food scarcity, this cou

    • It is solely about dairy products, since even lactose intolerant people can drink fresh milk due to it still containing necessary enzymes.
    • The Phantom drank milk, and he was stronger than 10 tigers...

    • Ideal in northern climates, where the growing season is limited and game is sparse.

      The ability to store something like cheese over winter would have given people an enormous advantage. Butter and, I think cheese, making equipment has been found in Scotland from the Bronze Age. Could be wrong on cheese.

      An alternative is fermented milk. Milk wine. I know of no evidence in Europe, but very little would have been preserved. Unlike stone items in a house, you're looking at wineskins attached to a horse.

      (Must Far

    • This event was before overpopulation became a serious problem in Northern Europe.

      Overpopulation lead to widespread malnutrition

      Malnourished babies of malnourished mothers would have benefited significantly from cows' milk. Possibly to the extent of whether families had several children living to breed, rather than none at all. The UK has been overpopulated since at least the 1700's, and also produces little or no food for about 1/2 the year. (Hence the need for imports we won't get after Brexit, and, tra

      • by Teun ( 17872 )
        Be careful to project the British (English) diet of your youth with diets in others parts of Europe.
        In the 1950's yogurt and other milk products were staple food here in The Netherlands.
        Yet cereal was to me unknown until around 1970, we had oats :)
    • And ghee lasts longer than either butter or cheese - decades if sealed in a jar.

  • I wouldn't rule out a mutation in one of the highly prolific men of the ancient world, a Ghenghis Khan type. If you get a few hundred women pregnant over the course of your life, and a even couple of your sons follow in your footsteps, the mutation could spread rather rapidly.

    • by DogDude ( 805747 )
      If there was no inherent additional reproductive fitness from being able to drink milk, though, those offspring wouldn't have any sort of advantage over their lactose-intolerant counterparts, so I don't think that would go anywhere, population-wise.
      • by kiviQr ( 3443687 )
        ...unless milk provided some immunity to a disease that wiped ones that did not drink it.
        • by vivian ( 156520 )

          My money is on cow pox.
          Probably saved a few milk drinkers from smallpox.

        • If you are lactose tolerant and live in a society of lactose intolerant people, how will you use your genetic advantage? In such a society there will be no dairy products. You would have to accidentally drink milk even though you were told that this will make you sick, and find that it doesn't. Or come across some foreigner from a society of lactose tolerant people that tells you about the advantages of milk. Both will be very unlikely to happen.

          • We know the spread of lactose tolerance in Europe. Started in southwest central Eastern Europe, then spread West into Europe, then north.

            So the initiating event is complicated to explain, but after that the information is easy enough to obtain.

            The initial event causes two problems
            First, as noted, there's nobody to say.

            Secondly, it's far enough south that there should have been less pressure on food in winter. Having greater access to food shouldn't have offered much of a benefit.

      • Huh?
        He literally said: "I wouldn't rule out a mutation in one of the highly prolific men of the ancient world, a Ghenghis Khan type."
        Let's say your genetic fitness factor is .5.
        The Great Khan? Like 20.
        Being The Great Khan means your genes have an advantage simply by volume.
        Evolution doesn't favor quality. It favors quantity. Sometimes, those follow.
  • by DogDude ( 805747 ) on Sunday September 06, 2020 @01:04AM (#60478144)
    Maybe at some point in history, farting was considered attractive, so people who drank more milk, and farted more, were more likely to find a mate and reproduce?
  • As mutant powers go, being able to drink milk isn't all that impressive but I'll take it.

  • by DudeBlokeLadFellow ( 6206386 ) on Sunday September 06, 2020 @02:25AM (#60478246)

    It's been known for a long time that lactose tolerance first appeared in a group called the Funnel-Beaker Culture in Northern Europe about 4000 years ago, and spread rapidly throughout Europe from there.

    I guess these fellows didn't get the mutation.

    • by Zumbs ( 1241138 )
      And here I was about to blame the Celts!
    • A quick check on the Funnel-Beaker culture shows that it is older than 4000 years old: 4300 to 2800 BCE, so that means some 6000 years old. This is still fairly young, in terms of human history and evolution.

      There are peoples such as native Australians that can trace their history back tens of thousands of years. I would be interested to know the prevalence of lactose intolerance among those people. Maybe it has been bred out now.

      What about India? This has to be one of the main milk-using cultures in the wo

  • TFA: That means that within about 100 generations, the mutation had penetrated populations across Europe. "That's the strongest selection found in the human genome," ... "We have to find a reason why you need this drink."

    Calcium helps you grow bigger quicker via bone growth. Goat milk similarly helped Africans grow larger. I don't know if size offered a physical advantage or merely a social advantage, because larger people need more calories.

  • by DrMrLordX ( 559371 ) on Sunday September 06, 2020 @04:22AM (#60478388)

    You are all cows. Cows say moo. MOOOOOOOOO! MOOOOOOOOO! Mooooo cows MOOOOOOO! Mooo say the cows. You milk-drinking cows!

  • Maybe the Romans had their equivalent of Starbucks, and they served milk based drinks. Fads can change population diets in less than a generation.

  • Become a mammal.

  • ...that's the reason they are dead.

    • ...that's the reason they are dead.

      No, they would still be dead - irregardless of their lactose tolerance (or lack thereof).

  • They saw all those "Got Milk" ads that said milk staches are cool...
  • Is this entire premise based on a composition fallacy or is the actual paper not so stupid (as usual)?

  • Benefit of drinking milk is very obvious. You can extract 10 times the carlories from the milk a cow yields in its lifetime compared to killing it for meat. So it is basically click bait to say "scientists are surprised/cofused/baffled." They know and publish the benefits of milk over beef for a long time. First I read about it is in the 1993 book by Jared Diamond The Third Chimpanzee.

    Once lactose tolerant gene mutation happens in a population, those who can digest milk in adulthood will quickly prosper

All life evolves by the differential survival of replicating entities. -- Dawkins

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