Lactose Intolerance and the Evolution of Human Digestion

[adelle0001]

very informative!

[mininjahwaiyah]

watching this for a science test on mutation :P

[matchbox555]

why do people get so sensitive when the topic of evolution is discussed ? what are they freaking out about ?

[creamyfilling102]

animals can drink milk. our cats drink it, and they're well into adulthood.

[SpeedyCheeze]

@creamyfilling102 actually most cats are lactose intolerant....

[creamyfilling102]

@SpeedyCheeze yeah i've heard that, but i don't know where ppl get it. all the farm cats we've had and they've all drank milk just fine.

[SpeedyCheeze]

@creamyfilling102 @creamyfilling102 Im sure some cats can, But I have had some that cant, as well as lots of other people. Also regarding farm cats, the more fat in the milk, the less lactose, if that means anything

[clockwise116]

I'm Mexican. So i have ethnic origins maybe not directly from europe but far back enough and i eat lots of starch products!

[ConditionLefty]

I can't believe someone so high ranking would miss the fact that raccoons, rats and skunks can drink milk in adulthood. They like us are considered omnivores.

[jijilamorosso]

This woman says A LOT of crap.

Her theory about the LCT gene being more present among those who come from ancient ethnic groups is Absurd.

She does not understand a thing about evolution.

COME ON PEOPLE. We do not come from chimps.

Stop trusting your school books, and make your logic work.

Lactose is a poison by the way. And even more dangerous when the milk comes from cows injected with a growth hormone.

Think people, think. Natural milk from the mother is necessary at birth but THAT IS IT.

[ninjatoothpaste]

@jijilamorosso We share a common ancestor with chimps, I can only assume that she was simply comparing us with our closest living primate relatives. Also it isn't enough to just say it's absurd, you have to say why it is and present your reasoning and any contrary evidence etc. Even a link to something you've read that convinced you of your opinion might be a good idea. Also, just about everything is a poison, it's dose dependent - take enough vitamin A and you'll die. Please expand on this!

[MrMZaccone]

@jijilamorosso Of course we don't come from chimps ... Who ever said we did? Do you have some evidence that what she's saying is absurd or are you just assuming that human diet and nutrition are as simple as you think they are? Fructose is toxic in pure form as well, does that mean we should stop eating fruit? Absurd? Try reading your own posts.

[UsernameError69]

what an idiot

[daveforfun22]

those of you in the room who are lactose intolerant aka genetically inferior =D

[nuFsIgnillorT]

@daveforfun22 xD I gotta get this out of my mind

[TVismyopiate]

Cannabis developed THC as a SUNBLOCK in order to protect its flowers from the harsh Himalayan sun. We dry those flowers, smoke or eat them, it just happens to get us high. The plant was then selectively cultivated and cherished, leading to it being the fittest plant to survive in that category, and winning the evolutionary race in that sense. What idiot would think they are above evolution (or God for that perspective) and want to criminalise possession of such a successful, well-evolved plant?

[molyvenson]

@TVismyopiate hahah a smart pot head. we need more of you lol.

[nuFsIgnillorT]

@TVismyopiate bullshit, you're already retarded from the smoking ahaha xD

[TVismyopiate]

@nuFsIgnillorT nope. Get off Youtube, put some effort in, google it, genius, then get back to me if your mind hasn't collapsed under the strain (no pun intended there, for those in the know).

[Horoe]

Will bodybuilders ever evovle synthetic testosterone gene? So they could be nautrally unnatural?

[mentalillnesstalking]

She just called me chimp-like! -scratches ass then sniffs fingers- What an outrage!!!

[TheRogueMonk]

does anyone know if adding sugar to milk will help digest better? even if you have weak lactose intollerance?

[squeezycheeseypeas]

@TheRogueMonk I think you can add the lactase enzyme rather than sugar

[SarahJ83]

@TheRogueMonk nope, it doesn't work, I've tried it.

[brainphreeze1906]

common

[platinum014]

@ManofManyPasswords about three IQ points

[Canihazcheezburgerz]

i cannot drink cow milk nor alcohole either my gene sucks

[nanatzu]

it's very common to feed cats with milk too, so you have another mamal who drink milk when grow up, are they tolerant?

[gongoozler18]

@nanatzu What does it matter? YOU are the one giving them the milk. Cats don't get nutritious off cow milk. And there are breeds of cats that get sick drinking cow's milk.

[nanatzu]

@gongoozler18 yeah, true

[hlyleh]

@nanatzu I think a lot higher percentage of cats are lactose intolerant than the percent of humans that are. But a decent portion are very tolerant but not 100% tolerant. I wouldn't let any cat have too much milk unless it's lactose free.

[paulokas69]

I didn't study the subject too much, but I often see adult cats drinking cow milk.

In cat evolution there's no way of cats getting a sip of cow milk. Only when modern men domesticated both cow and cat that began to happen.

[MrDasmaster]

@paulokas69 it isnt good for them ask a vet !

[GnariusFestivus]

Yay! I learned something new today.

[TheRogueMonk]

how aboiut cats genius

[joe133322]

@TheRogueMonk Cats drink milk because humans feed it to them... If we didn't, they wouldn't drink it. You dont see adult cats sucking a females tit, like you dont see a human adult sucking a females tit (not for milk, anyways lol). Adulds drink it because it tastes good and its a sourse of nutrition, like cats, but we were never intended to drink it after being a baby (which is why some adult bodys can't handel it).

[TheRogueMonk]

@joe133322 how do you know? if we are drinking it today which we are hen who is to say we did not ?

do you think we do things out of pure uninspiration from nature? you think cows eat so much and give us milk was a human intervention alone?

i greatly doubt it

[joe133322]

@TheRogueMonk Part 1) Drinking cow milk can be traced back to 7,500 years ago in Central Europe and the Balkans. There is no evidence of humans doing it before then. "do you think we do things out of pure uninspiration from nature?"... not quite sure what you meant by "uninsperation," (not a word) can you clarify your argument. And, "you think cows eat so much and give us milk was a human intervention alone?" what? your sentence structure doesn't make sense.

[sheenami]

@joe133322 Wow, you don't know anything about cows, do you? When you're a dairy farmer, you need to impregnate a cow every so often so that that cow maintains the ability to produce milk. Generally, a calf is weaned at 3 months. If left, the cow would then stop producing milk until it is impregnated again (generally artificially on modern dairy farms). Cows produce as much as they do today due to selective breeding. Offspring of the most productive cows are allowed to live and breed.

[joe133322]

@TheRogueMonk Part 2)  Cows don't produce milk for humans! They "eat so much" to live, and produce milk for their young. Cow (and other animals) milk was never intended for human consumption, but we do because it's a source of nutrition! Your view of cows purposely producing milk for humans is not scientific, and makes no sense in terms of evolution through natural selection. Your views are that of a creationist. Please be more clear on your argument.

[TheRogueMonk]

@joe133322 LOL completely without reason... lol say what you want man. I AM drinking milk and loving it.. and i thaNK GOD.

[joe133322]

@TheRogueMonk I'm completely without reason? I can say what I want, and so can you. I just want to hear your argument in comprehendible English. And there is no room for God in a scientific "debate". My views are backed up with science and common sense. What are your views backed up with? Faith?

[TheRogueMonk]

@joe133322 if your in someones house it is very much to do with them the house lord got things in his house for a reason not to waste our time.

I am not continuing this conversation on basis of irrationality ..

it is if i would say humans should not eat apples cause cows do not eat apples or grains

[joe133322]

@TheRogueMonk I'm not being irrational, and you don't need to respond. But do you honestly believe apple trees produce apples for humans to eat? I can't waste my time with you because, oh, wait, apparently it's all a part of Gods plan. Why is the sky blue? God. What cured my aunts cancer? It wasn't radiation and chemo, or the doctors, it was god. Science had NOTHING to do with it!... I don't fill in the blanks with God.

P.S. Cows do eat apples and grains

[TheRogueMonk]

@joe133322 yeah and we feed them and they feed us.

i did not say science is ot apart of it.. god loves sciece that is why he made it possible .

you have to quick taking things apart so much.. think complete 

[HybridD91]

@TheRogueMonk Really, God loves science? Ecclesiastes 3:11 seems to disagree but interpret what you want, after all, 30,000+ Christian demoninations did it.

[TheRogueMonk]

@HybridD91 why do you think for a second that religions or religion represent gods opinion..

besides tell me what ecclesiastes pharagraph and i will prob decode it for you.

science is nothing more then the advanced stage of whatever people used to do before.. saying science is a different path is just ignorant.. science is the complete range of intelligent experience of human kind.. how can this be against gods will .. dont be stupid

[TheRogueMonk]

@HybridD91 Ecclesiastes 3:11 (New International Version)

11 He has made everything beautiful in its time. He has also set eternity in the human heart; yet[a] no one can fathom what God has done from beginning to end.

lol tha tparagraph infact enhances my argument... not defeat it.. how is this against science.. THIS IS for science .. the etenity in their hearts..to eternally seek knowledge and to seek god .. to finfact science is the art of knowing what god has created beginning to end.

[TheRogueMonk]

@TheRogueMonk you should start using your own brain then what what the little man with the chair says to you..

your brani has great power of understanding.. its SCIENTIFIC

[ojideagu]

@joe133322 Many animals have symbiotic relationships. Aphids produce sweet sap, which Ants love

to eat. Ants protect and farm Aphids so they can get that Sap. Aphids didn't evolve sap for Ants, it's a waste product. It just happened that it fits perfectly for both.

Humans drinking cows milk and developing the ability to digest it is another Symbiotic relationship

which happens all over nature and is 100% natural and part of evolution.

Just as Ants evolved the ability to drink Aphid Sap.

[ojideagu]

Parasites are another good example. They evolve to live off another animal which was never part of their DNA. Parasites are the most numerous and successful animals on earth. Yet none of

them were originally INTENDED to live off another animal. They evolved it.

Animals like humans, adapt to things that were previously not intended. Drinking milk

was one of those evolutionary leaps which greatly benefited man and IS now 100% natural.

[ojideagu]

@joe133322 The fact many humans can digest milk means those humans ARE intended now to drink it.

It gives them a huge evolutionary advantage. An extra source of food, which could be the difference between life and death. Farming was what took humans forward.

[johnclockwork]

im no chimp, i get diahrrea, gassy and bloated when i drink milk...

[befranklintoo]

So many many claims using education"just to make a sale

on the market,same old game.

[DeletedDelusion]

Awesome stuff.

Thank you FORA.

[ProNorden]

I considered becoming lactose intolerant, but came to believe it's more important to be intolerant of other things.

[notToast]

lol

[ixipower2527]

it isnt something u choose... its something ur body cant digest because of a certain bacteria.... u dont Just consider becomeing lactose intolerant

[WhyNotTruth]

Is that dreadlocks or just messy hair?

[notToast]

lol

[bkelsey4]

Both of my sons who are halfChinese are lactose intolerant but love ice cream and can eat a little with no problem.We had to buy them soy formula which costs twice as much when they were babies.

I've read that those of Northern European descent are 90-95% lactose tolerant,whereas Asians are 90-95% lactose intolerant.Go figure.

[siradam575]

if you notice the asian diet doesn't have cheese or very much bovine dairy. w. europeans, on the other hand, have a tonne of cheese in their diet and historically have for centuries....

[Ducky1987]

Mutation is a means of evolution.

[TheRogueMonk]

@Ducky1987LOL WAHT ABOUT CATS.. cats drink milk.

[TVismyopiate]

@Ducky1987 mutation is a by-product of radiation from the stars, one could argue, meaning the resulting evolution is part of the glue that binds us to the universe as a living organism...

[yoshi3329]

I heard about this, Most Black American (descendants of West Africans) can't break down milk. This explains a lot.

[burntonion05]

So this would lead me to believe that redneck repub types would be lactose intolerant since many of them are primative in their ways of thinking.

[cat22203]

and behavior unfortunatly because it impacts animals, nature and humans around them

[MoltenPlastic]

Cats can drink milk as adults, however?

Anyone think this has anything to do with an ancient co-existence with human herders?

[JasonMelancon]

The question is, can they digest lactose? And the answer is, not if they are weaned.

[JasonMelancon]

I liked the full version of her speech. She says things about so-called "junk DNA" that resonated with me. I've always thought it was terribly arrogant to be calling sequences "junk" just because we didn't know what they did.

[MoltenPlastic]

Are you suggesting that the DNA is offended by the nomenclature?

[JasonMelancon]

Did you watch the full speech? I'm not suggesting anything different from what the researchers concluded.

[vicket76]

what if the mutations are deliberate? maybe through vaccinations? who would benefit financially from mutating our genes so that our bodies would more easily process animals and the products made from them?

I've always wondered about chicken pox. maybe we're not supposed to eat chickens or be near them. but maybe through vaccinations or something, our genes are mutated to accept chicken in our diet. there seem to be many different explanations of where the term "chicken pox" originates..

[Slug99]

Please, do some research before you post comments like these. Chickenpox is not caused by chickens.

[vicket76]

i did some research and it's basically unknown where the name came from - it's based on how the disease looks. It looks like a chicken comb, it looks like you've been pecked by a chicken, etc. And I have yet to find anything saying exactly where varicella originates.

[PaulCynic]

She's concluding something without proof. An alternative hypothesis is that ancestral populations didn't adapt specifically to these "new" foods, but that a mutation in the gene made these foods efficient energy sources (more so than for those without it) and so mutation preceded preference. The way she states it, if a population eats enough asphalt, their biology will start to digest it.

She's not wrong to point at the correlation, but she's definitely wrong to assume the causation.

[caltrop69]

PaulCynic:

Yeah...I caught that, too...But, I just assume that those familiar with how evolution works just "talk" that way.

At the end, it sounded like she was implying that we "came" from chimps, as well, rather than a common ancestor.

I'm fairly certain you were down-voted because you used the word "correlation."

Psst..."correlation" is too big a word to use on Youtube. People down-vote you when you use words they don't understand.

[alwiser]

I think she was implying that we "are" a type of chimps.

[hasatum]

I think that's expecting a bit too much from just a talk. In a formal paper you could hold her to a higher standard. Your example about asphalt is interesting though. I strongly suspect that if a population did eat enough asphalt and there were any calories to be had, humans would eventually evolve to metabolize it. Bacteria certainly metabolizes virtually anything with caloric value up to and including uranium. We should all be careful about our assumptions.

[PaulCynic]

:P You're arguing my point.

[hasatum]

I don't think so. You suggested that mutation preceded preference. I then used your example to argue that if humans ate a lot of asphalt (preference) they would eventually be able to digest it (mutation). That is, preference might indeed precede mutation. The way she described events is perfectly sensible, though as you pointed out, not necessarily the only possible explanation. Perhaps this is what you meant by me arguing your point?

[PaulCynic]

I'd push my argument farther but I don't have proof. What I do know is that even though behavior is an agent of natural selection, changing behavior does not cause a specific, functional mutation.

I couldnt flap my arms for the rest of my life and expect my children to grow feathers. A functional mutation should exist before it can then be selected into the population via a shift in behavior.

My point being that natural selection after mutation accounts for European tolerance, not vice verse.

[hasatum]

No one is arguing that behavior causes evolution. If a particular behavior is stable across generations, however, it does enable evolution. If you taught your children to flap their arms their entire lives and they taught theirs, only strong-armed people people would stand a chance of passing on the behavior. These people would benefit more from spontaneously mutated feathers than another population with much weaker arms. Evolution doesn't work the way it should; it works every way possible.

[PaulCynic]

Dude, you're still arguing my point; so I don't know what to say exactly, except "I agree."

"These people would benefit more from spontaneously mutated feathers than another population with much weaker arms." -- You

"My point being that natural selection after mutation accounts for European tolerance, not vice verse." -- Me

[hasatum]

Really? The speaker implied that preference for starchy food came before the ability to better digest it. In your original post, you claimed that she had no proof and that the opposite was true, that people developed the ability to better digest carbohydrates which only later led them to eat more starchy foods. I argued that the speaker's explanation was at least as credible as your own. How is that not disagreeing?

[ncfwhitetigress]

But the changes only began 10,000 years ago and there hasn't been enough time for evolution to make milk and grains ideal food sources for humans to digest yet. We'll still be healthier if we stick to the ancestral diet of veggies, fruits, lean meats, etc even if we do carry the mutated genes.