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Thread: Black and white

  1. #1 Black and white 
    Forum Sophomore Hymenophyllum's Avatar
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    Is it possible that black man suddenly become white? Which diseases are responsible for this?


    I can't speak english.
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  3. #2  
    has lost interest seagypsy's Avatar
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    Vitiligo

    While it doesn't cause the ethnicity to actually change it can make the skin color appear to be Caucasian as it did to Michael Jackson.

    Vitiligo - Wikipedia, the free encyclopedia

    White people can get it too but it isn't as noticeable on people who's skin is already light in complexion. My uncle who is white has it but you can only see the white patches if he spends time in the sun and gets a tan. The white patches burn but never turn to a tan.

    I also wouldn't call it sudden. It is more of a progressive thing. Starts with small patches and can spread over the entire body over time.


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    Forum Sophomore Hymenophyllum's Avatar
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    Thanks,
    i have one more question. Can it work the other way - white become black man?
    I can't speak english.
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    Brassica oleracea Strange's Avatar
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    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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    has lost interest seagypsy's Avatar
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    Quote Originally Posted by Hymenophyllum View Post
    Thanks,
    i have one more question. Can it work the other way - white become black man?
    I agree with strange. There is no disease that I know of that causes one to develop more or darker melanin in general all over their body. But a white person that tans easily can over tan. Making them look very very dark. But it would begin to fade as soon as they stop tanning enough to sustain the color. It also puts them at very high risk for skin cancer.



    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.
    Last edited by seagypsy; October 11th, 2013 at 02:59 PM.
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    has lost interest seagypsy's Avatar
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    now if you'd like to turn blue, you can either hold your breath for a really long time or do what this guy did.... rub colloidal silver all over yourself. but no doctor would recommend doing such a thing. They don't know if it is dangerous or not because there hasn't been enough testing to determine that.



    This guy recently died of a heart attack at the age of 62.
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    well whole white race... is a mutation according to science but how sudden is it??? I don't know
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    Forum Radioactive Isotope skeptic's Avatar
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    Not a mutation. Skin colour is determined by many genes, so that a single mutation has insignificant effect. However, in any population the wide range of skin colour genes is sufficient so that evolution increasing the frequency of some genes and reducing the frequency of others is enough to cause substantial change in skin colour.
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    Moderator Moderator Cogito Ergo Sum's Avatar
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    Quote Originally Posted by seagypsy View Post
    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.

    If you had not provided that information, I would have thought that she rubbed feces on her face.
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    Nature produces different skin colors when the sun spectrum is the same for all people. Is there a net benefit? Why can white people not turn black skin the same as black people develop white skin? If this phenomenon is caused by a gene disorder, why does it not happen in the reverse?
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    Forum Professor Daecon's Avatar
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    The development of lighter skin colours while in cooler (temperate I think is the word?) climates wasn't needed to be selected against by evolutionarty processes, so it was able to spread throughout the population. At least, that's what I think.
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    Skin color is a balance between vitamin D production, ultra violet levels, and solar skin damage. Evolution leads to the optimum balance of genes for lighter or darker skin. Vitamin D is manufactured in the human skin when ultra violet light strikes the skin. Too much ultra violet leads to sunburn and later skin cancer.

    For peoples living in latitudes where the sun is weak, and ultra violet levels are low, a dark skin would be counter-survival, since it would prevent enough vitamin D production. We see that today in African immigrants to countries like Scotland or Sweden, who have to take vitamin D supplements to stay healthy. So populations living in those places evolve fair skins.

    People living in places where ultra violet levels are high (tropics), will get enough UV to make their vitamin D, even if their skins are dark. The melanin in the dark skins, though, blocks most of the UV, and prevents sunburn and skin cancer. So tropical peoples tend to evolve darker skins.
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    Were black people and white people the same color at one time? Did evolution separate us in two color directions? Do black people and white people need the two types of vitamin D? Do we now have the same DNA?
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    Forum Professor Daecon's Avatar
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    People were originally dark-skinned because humanity evolved in the African region. Evolution hasn't really "seperated" us anymore than people with different hair or eye colours. We're all still people, just with different looks.
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    has lost interest seagypsy's Avatar
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    Quote Originally Posted by skeptic View Post
    Skin color is a balance between vitamin D production, ultra violet levels, and solar skin damage. Evolution leads to the optimum balance of genes for lighter or darker skin. Vitamin D is manufactured in the human skin when ultra violet light strikes the skin. Too much ultra violet leads to sunburn and later skin cancer.

    For peoples living in latitudes where the sun is weak, and ultra violet levels are low, a dark skin would be counter-survival, since it would prevent enough vitamin D production. We see that today in African immigrants to countries like Scotland or Sweden, who have to take vitamin D supplements to stay healthy. So populations living in those places evolve fair skins.

    People living in places where ultra violet levels are high (tropics), will get enough UV to make their vitamin D, even if their skins are dark. The melanin in the dark skins, though, blocks most of the UV, and prevents sunburn and skin cancer. So tropical peoples tend to evolve darker skins.
    Actually even fair skinned people in Sweden have to take Vitamin D supplements. I remember when I visited there a friend was telling me she had to take her daughter in for her D shots. And she explained to me that everyone there gets them during the winter months because they don't get enough D during that time. but not during the summer because the sun barely sets during the summer. That's why you hear about beautiful Swedish tans.
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  17. #16  
    Forum Radioactive Isotope skeptic's Avatar
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    Thanks for that, sea gypsy. I did not know that, and it is interesting.
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    come to think of it, I wonder if other animals besides humans also need vitamin d. Without it we become lethargic and our metabolism slows down. I wonder if vitamin D is part of what makes our biological clock work. Animals that go into winter sleep or hybernation may do so simply because they are short on vitamin D. Perhaps if Vitamin D licks (like salt licks) were put in the wilderness where bears that usually sleep during the winter live, they wouldn't go into hibernation. Of course then they'd be short on food and likely be coming into human territory getting themselves shot and killed. Maybe we should just let a sleeping bear sleep.
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    Quote Originally Posted by Daecon View Post
    People were originally dark-skinned because humanity evolved in the African region. Evolution hasn't really "seperated" us anymore than people with different hair or eye colours. We're all still people, just with different looks.
    Do white people and black people have different genes? It makes me wonder if there is a nenifit to either.
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  20. #19  
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    Quote Originally Posted by seagypsy View Post
    come to think of it, I wonder if other animals besides humans also need vitamin d. Without it we become lethargic and our metabolism slows down. I wonder if vitamin D is part of what makes our biological clock work. Animals that go into winter sleep or hybernation may do so simply because they are short on vitamin D. Perhaps if Vitamin D licks (like salt licks) were put in the wilderness where bears that usually sleep during the winter live, they wouldn't go into hibernation. Of course then they'd be short on food and likely be coming into human territory getting themselves shot and killed. Maybe we should just let a sleeping bear sleep.
    I had some bearded dragons once that required vitD supplements, or they would develop a neurological disorder.
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    Quote Originally Posted by Stargate View Post
    Quote Originally Posted by Daecon View Post
    People were originally dark-skinned because humanity evolved in the African region. Evolution hasn't really "seperated" us anymore than people with different hair or eye colours. We're all still people, just with different looks.
    Do white people and black people have different genes? It makes me wonder if there is a nenifit to either.
    Genes govern traits not an entire race. Race is a loose term usually referring to a perceived collection of traits associated with people from a particular region of the planet. But we are all the same species. So while fair skin is more common in Caucasian people than in Africans it does not mean that a person born with fare skin must be African or vice versa.

    10 Black Celebs Who Successfully Pass For White - Atlanta Black Star
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    Would you say skin color is unimportant? if our genes and organs are the same, why do we have different colors, is there a benift?
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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by Stargate View Post
    Would you say skin color is unimportant? if our genes and organs are the same, why do we have different colors, is there a benift?
    Everyone has (slightly) different genes. That is why we all have different hair, eye, skin colour, height, noses, etc. Often the variation within a given population is greater than the average difference between that population and another.

    Light skin probably evolved because as people moved further north and needed more sun to synthesize vitamin D. (Although, I vaguely remember reading that it isn't quite as simple as that...) There may also be disadvantages to having so much melanin in the skin, which is offset in the south by the protection from UV it provides.

    All of which makes light skin "important" in more northern latitudes and dark skin more "important" further south. (Depending what you mean by "important".)

    I assume blue eyes and light hair evolved purely as a side effect of that: less coloration all round.
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    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by seagypsy View Post
    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.

    If you had not provided that information, I would have thought that she rubbed feces on her face.
    Has amazingly few wrinkles for that much sun exposure.
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  25. #24  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by babe View Post
    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by seagypsy View Post
    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.

    If you had not provided that information, I would have thought that she rubbed feces on her face.
    Has amazingly few wrinkles for that much sun exposure.
    That'll be the feces.
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  26. #25  
    Theatre Whore babe's Avatar
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by babe View Post
    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by seagypsy View Post
    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.

    If you had not provided that information, I would have thought that she rubbed feces on her face.
    Has amazingly few wrinkles for that much sun exposure.
    That'll be the feces.
    Damn you!!

    I spit my water out all over the desk again!!!! *glare*.......would you please give me an IOTA of warning before you display your wit? *laughing*
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  27. #26  
    has lost interest seagypsy's Avatar
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    Quote Originally Posted by babe View Post
    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by seagypsy View Post
    This is an example of a Caucasian woman that tans excessively. The first pic is obviously less tanned than the second.

    If you had not provided that information, I would have thought that she rubbed feces on her face.
    Has amazingly few wrinkles for that much sun exposure.
    Well considering she has a 6 year old daughter, she is likely to not be older than 40 and she looks like she is about 55-60, I wouldn't say she is holding up well at all, her skin looks like leather. Not very youthful at all.

    Ok I looked her up. apparently she is 44 years old.

    http://dailycaller.com/2013/07/08/ca...-this-weekend/
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    Do you know of, or have you ever heard of a white man turning black from a disease as we have heard the other way round. If you have, is there a name for it. I have read and heard that our genes are all mixed up, a little in all humanity, this puzzles me a bit.
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  29. #28  
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    Quote Originally Posted by Stargate View Post
    Do you know of, or have you ever heard of a white man turning black from a disease as we have heard the other way round. If you have, is there a name for it.
    See post #4:
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    Thank you for the link it was quite interesting. I have tried to find some info on the skin itself turning black on white men, but it seems such a disease only show up on specific organs. I would like to know if the reason for dark skin is mainly based on the consumption or the radiation of vitamin D. If a black person was to only feed on vitamin D from the plant world, would the dark pigment be maintained the same way as with vitamin D from the sun.
    I am wondering if vitamin D is the only answer to the coloration of the skin.
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  31. #30  
    Brassica oleracea Strange's Avatar
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    No. It has nothing to do with vitamin D intake. It is genetic.
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  32. #31  
    Forum Radioactive Isotope skeptic's Avatar
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    Vitamin D is found in a few foods, such as milk and eggs, but those sources are quite inadequate to meet our needs. Ultra violet light on the skin produces heaps.
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    Are you saying we need both? I was thinking white people would not need the vitamin D from the sun and black people would need only sunlight.
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    has lost interest seagypsy's Avatar
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    Everyone needs vitamin d or you will develop Rickets
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  35. #34  
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    To Stargate

    Our primary source of vitamin D is sunlight. If you get sufficient, then no other source is required. However, as sea gypsy pointed out, it appears there are places where, in winter, there is simply not enough sunlight. When that happens, an alternate source of vitamin D is required.
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