The Effect Of UV On Melanin | Colour the Spectrum Of Science | BBC Science
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- Опубліковано 5 лип 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.
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.
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.
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)
How do animals get vitamin D if they are covered in fur?
UV light penetrates light layers, even skin
Always get an old school camera to record those UV beams, put em on a secure cloud storage 😂
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
BBC EARTH SCIENCE.❤.
Children of the Sun (Son).
no, standing too long in the sun
brilliant
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.
Not an accurate map
Explain why?
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
👏
It’s called carbonated melanin… From the cosmos
dumb afrocentrist
0:09 - 0:16
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.
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
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 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
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?
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
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.
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 the use of sun block is affecting this natural adaptations? You know, epigenetics. Cheers.
This is old news
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.
Is that really new for anybody?!
I am confused, that is absolut common knowledge for me an my hood.
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 😆
this is painful to watch lol.
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?
Lol why we don’t have more black people simce it’s getting hotter everywhere 🥵 🤣
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”
And all credit for racism goes to our favourite europian.😎
This is new? I mean... everyone already knew this, right?
Its because of the latest misinformation put out by the ant-sunscreen movement.
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
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
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.