The Effect Of UV On Melanin | Colour the Spectrum Of Science | BBC Science
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- Some wavelengths of UV are essential to the human body, in order to promote the production of vitamin D in our skin. But with different levels of UV in different places how has the human skin colour adapted throughout generations and across the world?
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they didn't mention the most interesting fact. Completely different genes are responsible for light skin feature between whites and asians, they developed light skin independently from each other. which means that natural selection was brutal in prehistoric times.
What do you mean by "Asian"? If you are British I think you mean
subcontinental which is basically Indian. As a person of Chinese ie Asian descent to me Asians are what used to be referred to as Oriental. All of my Nepali friends call Indian looking people Subcontinental.
I'm just curious.
I work with many Asians from various countries eg China, Thailand, Vietnam, Laos etc and a lot of Subcontinental people too. Indians, Bangladeshis, Nepali, Sri Lankan, and Pakistanis. None of the second group call themselves Asian.
@@stephanieyee9784When I was at school we were told there were five continents: Africa, America, Australia, Asia, Europe. At that level, the Indian subcontinent is still part of Asia. I wouldn’t want to be described as French but I’m happy to be European.
@@janepage3608 what kinda assbackwards logic...
(@@stephanieyee9784
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I’ve found this to be something to be aware of as a darker pigmented person raised in a cold temperate climate, the risks of melanoma vs continuous vit D deficiency. One of my children who has my exact pigmentation is already being treated for extremely low vit D levels at 13.
I’m glad that knowledge about this is becoming more common, schools in my country are having more classes in an outdoor environment ect, to reduce the mass immune health risk we are heading into.
Free Vit D for people affected could be a policy that reduces future health complications, just as my country subsidises sun block to reduce melanoma risks.
Could live where your body is adapted for. ..
@@triumph.over.shipwreck As far as I know where I live is where my family has lived for over 7 generations. I don’t know where my colouring comes from 🤷♀. Only one of my 3 children has my colouring should I move them to where their body is not adapted for 😂
@@alyssaoconnor Of course not. The more children you have, the more handouts you can complain for. Don't part with that investment so readily.
@@SoniaH-m4g Why phrase a question as to where the bait would have me defend a position that I don't actually have?
Whether you stepped off a trash pile from the Caribbean and onto Floridian soil this morning or you can trace your ancestry back to the very cargo hull your relative was transported in, I care not. I welcome you to suckle at Uncle Sam's teet as much as YOU like, regardless of how he may feel about it.
Thanks for explaining my sharp contrast in changing melanin throughout the seasons. I tend to look Phillipino in the summer, and Korean in the winter.
Lol. Which one do you prefer and why?
You should see my skin. I have two colored arms. I come from Kashmir. In winter my skin brightens like I am a European and summer makes me dark. Even sunscreen does not help much, may be i am applying less. But astonishing fact is when I come to Dubai which is at lower hight as compared to Kashmir, my skin does not darken even in summer. I guess higher I go from sea level the UV index increases.
That’s interesting. Yes, more UV in the heights of Kashmir so you need more protection from it.
Certainly, if you're from the higher parts of Kashmir, like Leh or Zanskar, the sun is much stronger there than in the Middle East.
me too from kashmir (machil valley) and same happend with me, i worked in saudi arabia for 2 years and my skin becomes white meanwhile when i am in village in kashmir during summers it becomes brown, when i remove shirt my skin had white and brown difference and in winters my whole body skin becomes white and pink
@@pjacobsen1000 it is lie, leh and zanskar are cold but people become dark when visit there, saudi arabia is hot but people become white there
@@user-yh1qd7lj5f Yes, that's what I'm saying. You are misunderstanding my comment.
Another fascinating article from the BBC.
Thank you
(I've missed seeing the programme the clip was taken from - I will attempt to find it, as I'm sure it's worth watching)
I’m originally from west Africa and have very dark skin. Moved to the Northeastern part of the U.S. in childhood. When I first had my vit D levels checked in my 20s , it was 7, (normal should be 30-100). My doctor immediately put me on high dose cholecalciferol to take once weekly then it went up to 16.
according to the map there is more uv radiation in east African than in west africa ,
but people in west africa have darker skin tone than east african people , why is that ?
There is a very large range of skin tones in both East and West Africa, and Nilotes and Cushitic peoples generally speaking have very dark skin tones, while some of the lighter skinned populations of the region have some West Asian admixture dating to the last few thousand to few hundred years ago. Many modern West African populations are also a result of mixing between aboriginal forest dwellers and Sahelian and Saharan influxes from regions with higher UV radiation over the past few millennia.
Eastern African are mixed with Middle Eastern
UV peaks in South Sudan area and along the Nile if you observe the photos.
That's home to Nilotes, and we're the darkest there is😁
The other areas have dramatically lower UV and that's why you have Ethiopians and Nubians with Middle East admixture.
Then in places like central & Eastern Kenya ....and even WESTERN Kenya we have extremely fair skinned Bantus who came from Southern Africa just a few years hundred years ago! The light Bantu in Eastern Kenya live in a semi arid area.... showing how big the UV difference is even in a tiny country.
@@peter320vnnot all many Nilotes without any admixture live there and the super high uv is consistent with that.
Many light skinned people in EA came from Southern Africa...the rest live in Ethiopian Highlands with dramatically lower UV.
What do you mean by West African? I think Moroccan have similar skin tone with Egyptian
All hearts have the same color!
False, depending on how healthy you are, your heart colour might look different. Also water is wet!
Nope
And?
@oKOMAPo well done for outing yourself as that dunce who doesn't get it.
Yeh just the skin their talking about
How do animals get vitamin D if they are covered in fur?
UV light penetrates light layers, even skin
🙄
They get it through diet since they lack the ability to oroduce it via the skin. (Not all animals are the same of course)
Which animals?
Animals with fur? They don't use any clothes, remember😊
UV radiation can penetrate through hairs. It's an EM radiation.
BBC EARTH SCIENCE.❤.
That map missed the darker skin of real north Americans.
And indigenous people of Australia, too
no its accurate. they are a very very light brown. go to a reservation some time.
Red indians
@@531c Don't say Red indians
Native Americans indians are in India@@531c
I'm of north indian origins and light skinned but my hands are way more fairer than my face
I always thought it was because I wash them more frequently
north indians are not fair skin they are dark compared to middle east and white europeanas
Baisically, when humans migrated out of Africa, to the North, the region didn't had enough UV to keep a human healthy. So those with darker skin died while those with lighter skins survived. That's basic natural selection. And when those with lighter skin moved more north, UV exposure became more less and only those with more lighter skin survived. And when those with lighter skin tried to move back, they also died because of huge UV radiation and it was unlivable for them. That's how the different skin colours were created in Earth. People started to live everywhere only after people started to eat other sources of vitamin D rich food or supplements and sunscreens. Baisically, those with brown skin can live anywhere. 😅 Their skin gets darker in sun rich areas and lighter if there is no exposure to the sun.
Always get an old school camera to record those UV beams, put em on a secure cloud storage 😂
I am easter african(habesha to be specific)...my inner hand and face have noticable difference. During rainy seasons or when i relocate to areas with less sun exposure, i become lighter in summer i become more dark on my face, hands and legs
Children of the Sun (Son).
no, standing too long in the sun
We are the people of the Sun... Sun-Ra
@@abrahamjackson6019 based on your profile picture you appear to be son of west african people but you seem to be lighter skin than pure west africans so I think maybe you might have like 1/4 (25%) mix of European white ancestry. So you are a mix of Viking and Nigerian. Your name also seems to be of european christian origin, Not an egyptian
@@SpiritualSeeker-oq5pt Abraham is actually a biblical Islamic name in origins , also 0 Euro blood. There are many complexions on the continent of Africa It may be the Central African dna.I share with king Rameses and Tut, that gives me my lighter skin tone
@@abrahamjackson6019 🙄
very interesting explanation about tanning's role!!!
I'm Indian and even if I get in the sun for an hour, my skin gets extremely dark(not as dark as someone who's black but still) but otherwise it remains light brown. And that too only the areas exposed to the sun.
be careful if you stay in the sun for too long you will become like ravana dark complexion
@@SpiritualSeeker-oq5pt thank you for your concern
@@vjndr32 saar I am fair saar I apply cow mutra to stay fair saar I am same colour as pakistanis saar white saar hahaha
@@vjndr32 this is you: "saar I am light complexion saar I am like pakistanis saar white saar I will apply cow dung on face to become white again saar"
@@SpiritualSeeker-oq5ptAnd strong and beautiful
Imagine that mammals didn't have to experience nocturnal bottleneck. We would still have more pigments other than just melanin and the skin colour would have been more various like birds and reptiles.
This is why I am so white in the winter but black in the summer
We all have the same origin and we spread across the globe. Based on UV, food and environment, we changed to who we are today. BBC Science, correct me if I am wrong.
Not an accurate map
Explain why?
If Trust me bro was a person.
Interesting! are these changes notable in like african american who have been in america for hundred of years compared to africans or like white americans compared to europeans or maybe white australians?
The difference would be on their exposure to the sun. Whute Australians are still genetically european as African Americans are still Africans. Unless they are mixed with other ethnicities, where they would share traits
How does this affect the more modern humans that wear clothing which I'm guessing was never the intent? Does it have any impact at all or is this something that would take many generations before we start seeing the effects?
Well, I for one have been dignosed with a vitamin D deficiency. This is largely because, as I have incredibly pale skin and live in a relatively hot climate, I avoid the sun as much as possible, but if I was walking around naked, yeah, that would probably be a different story. Thing is, though, thanks to modern medicine I was just able to take some vitamin D tablets, so the deficiency had no impact on my chances of reproducing, which is what's required for evolutionary change to happen. In many, many ways humans have sidestepped evolutionary pressures through our technology.
When did science become about making up unmeasurable narratives about long ago times? There is nothing scientific about that. Thats what happens when you take a limited tool and say that tool is the only epistemic method. You end up contradicting yourself and ignoring that fact.
What about the khoisan people, light skin color in the middle of the desert?
It’s called carbonated melanin… From the cosmos
dumb afrocentrist
Skin color has absolutely nothing to do with where u live but everything to do with your genetics, DNA .
Those changes happen after living in a different UV zone for thousands of years. Eg:- Andamanese and indigenous australians are related to east asians. Yet they look completely different
@@user-hr5gq9hq6gyes, closely related but after the ancestor of east asian split from the common ancestor of andamanese, papuans, and native australians, they develop lighter skin and according to the human migration map, light skin in east asian evolved in central China.
Where is your research?
Your genetics respond to your environment too bro, that's called epigenetics.
Skin complexion was under very serious selection pressures which was environmentally determined.
In india there are people who are whiter than snow
What kind of incomplete study is this
brilliant
The map is inaccurate
I’m glad researchers are still pursuing topics on race. This seems like such an obvious subject and I wonder how many people have been scared of researching it for fear of offending someone. It’s crazy to see how humans evolved. I was watching the 100m men’s final today in the Olympics and there was one very obvious first impression. No White/Asian guys.
Why would a research into Melanin offend anyone? Your 100m comment, is that a problem? The Olympics are a true meritocracy. No one to cheat for you or to put others down because they're not white in order to prop up inferiority. If you're not good you don't get in. Perhaps White/Asian guys should work harder.
We should all be Black. Forgot about the Natives in the North, Asia including Russia & America have darker skin. I think this explanation might need updating.
I wish there was more research into African fair skin....I think it's really interesting that many with really fair skin sometimes have wavy instead of coily hair. It's obvious many of them have ancestors who migrated recently so I wonder if they'll adapt woth getting more melanin or simply stop being light
@@hifiphono887 she said African not confused people who fell from the sky. KhoiSan are not "mixed". However they do have kinky hair so that assessment was incorrect.
How do I increase my melanin?
pay reparations.
Go out in the sun
@@kreativeforce532 😅 what about the melanin people who didn't pay the due reparations in first place ?
@kreativeforce532 😄✊🏾💖
Be of African descent. Or at least South Asian.
0:09 - 0:16
I love how they emphasize on the fact that our ancestors had more exposure to sun meaning they were darker, skinned, ding, ding ding we reside from Dark skinned people. And white people came many generations after.
Blame yakub.
Yea but this whole idea isn’t true. Also you should find that degrading because that goes along with the idea that we were once animals. So you are saying darker people are closer to our animal relatives. I don’t believe in evolution but that is the idea you are praising. The scientific worldviews on humans and race are the origin of “racism”
How is melanin connected to fast twitch muscle fiber?
It's not related
those who have more melanin have more fast twitch muscle fiber.
@@kreativeforce532
Obvious myth in general
Darker melanated people have genes with uncoupled haplotypes which makes them more efficient at using the sun for energy. Your mitochondria receives electrons and protons from the sun and from food except the sun photons don't require metabolic processing like digestion. Our bodies are full of visual and NON visual photo receptors. Each color of the sun spectrum has a purpose, even those invisible Invisible to us. Your skin is the solar panel and your mitochondria are the battery
@@kreativeforce532 that is just correlation but you did not prove that melanin causes fast twich
BBC nasa lost all movie tapes recorded on the moon. All documentation. We’d love to have a special about greatest achievement of mankind lol 😆
How the use of sun block is affecting this natural adaptations? You know, epigenetics. Cheers.
medium skin mogs
Cringe
This is old news
This is nonsense skin color has to do with UV but with varying degrees of Albionism.
What has changed was not only the skin color, was it? Just look at their different faces
Well this video is about melanin. You want them to list all the things that make humans unique?
👏
Skin color has to do with genetics,as you see south America doesn't have people with very dark skin color abd Australia does.Australia is quite south , skin color come from people whos ancestors moved to certain areas
Native South Americans and native Australians have dark skin because so much generations adapting there.
@@bitchcraftwitch351actually native american are not that dark compared to native australian and papuan
y trade skin carcinoma for vitamin D when we can eat vitamin D?
bceause in ancient times vitamin D food was not guaranteed and the main source of vitamin D is fish. So if you are dark and wanted to live far away from rivers or oceans then it would not be possible because there would be no source of vitamin D
@@SpiritualSeeker-oq5ptit was the invention of agriculture that was responsible for fair skin
@@Peter_Sokunbi nonsense, fair skin was common in europe before agriculture.
@@Peter_Sokunbi I am medium skin tone Southern Italian and I am very attracted to fair skin women
Is that really new for anybody?!
I am confused, that is absolut common knowledge for me an my hood.
this is painful to watch lol.
Why?
This is new? I mean... everyone already knew this, right?
Its because of the latest misinformation put out by the ant-sunscreen movement.
Lol why we don’t have more black people simce it’s getting hotter everywhere 🥵 🤣
And all credit for racism goes to our favourite europian.😎
God is magical
There's no credible evidence to show or support a God in existence anywhere in reality.
@@fresh-eggslife
@@thetatso9462 Nope you are wrong. Again -->> There's no credible evidence to show or support a God in existence anywhere in reality.
@@thetatso9462 Life tells us nothing of whether a God exists or not. All life tells us is that life exists.
@@fresh-eggs so you must have figured it all out.
Getting that row of people without anyone saying racist is quite a feat
I am sure the context is the solution :)
What could they say when their degeneracy is being tested by this context
Not really, just focus on the skin darkness level and there's no problem. Don't say anything negative or positive and there's no problem
Out of all the people you could've picked, you ended up finding the Clearasil Kid. Somebody buy him some soap!
Exactly what I was thinking! I thought they only had Clearsil in the UK lol! Brought back secondary school memories 😂👍
This happens alot to Blk models, actors or random people interviewed by journalists. They choose the least attractive and least articulate person to represent Blk people.
Ouch. This video raises many misinformation points and scientific red flags in my book. The BBC disapoints me greatly here.
Like what?
But Greenlanders and Inuit are dark skinned. How come?
Easy answer. Those areas aren't exactly known for their forests, so not a lot of shade to go around. Large tundras of ice means a lot reflected UV rays. (It's why skiers and snowboarders where sunblock-.it's way easier to cook yourself out in the snow than you might think).
Plus we're talking about ancestors of darker haired, darker skinned people from east Asia that crossed the Bering Straight ice bridge. When they did that, the blonde hair, blue eyes mutation in the Nordic countries probably hadn't even taken off yet, and by the time it did, the ice bridge was gone, cementing certain features into the first natives of those lands.
@@The_Hagseed
@lycaonpictus4433
Said:
"If you get enough vitamin D from food there's no significant pressure for getting lighter skin tone.If you get enough vitamin D from food there's no significant pressure for getting lighter skin tone."
Glare from the ice. You can easily get sunburned there.
Doesn't snow reflect UV a lot?
And native Greenlanders look pretty fair skinned unless I've only seen a few
Is that a thing? Wow.