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Light skin is a naturally occurring human skin color , which has little eumelanin pigmentation and which has been adapted to environments of low UV radiation. As populations migrated away from the tropics between , and 65, years ago into areas of low UV radiation,  they developed light skin pigmentation as an evolutionary selection acting against vitamin D depletion. Humans with light skin pigmentation have skin with low amounts of eumelanin , and possess fewer melanosomes than humans with dark skin pigmentation.
Light skin provides better absorption qualities of ultraviolet radiation. This helps the body to synthesize higher amounts of vitamin D for bodily processes such as calcium development. As consequence of folate depletion, they are at a higher risk of DNA damage , birth defects , and numerous types of cancers , especially skin cancer. The distribution of indigenous light-skinned populations is highly correlated with the low ultraviolet radiation levels of the regions inhabited by them.
Historically, light-skinned indigenous populations almost exclusively lived far from the equator, in high latitude areas with low sunlight intensity; for example, in Northwestern Europe. Due to mass migration and increased mobility of people between geographical regions in recent centuries, light-skinned populations today are found all over the world. An abundance of clinical and epidemiological evidence supports that light skin pigmentation developed due to the importance of maintaining vitamin D3 production in the skin.
This accounts for the development of dark skin pigmentation of people living near the equator but does not account for the increasingly lighter-skinned people living outside the tropics. In the s, biochemist W. The overwhelming positive effect of UV radiation in land-living vertebrates is the ability to synthesize vitamin D3 from it. A certain amount of vitamin D which penetrates the skin helps the body to absorb more calcium which is essential for building and maintaining bones, especially for developing embryos.
Vitamin D production depends on exposure to sunlight. Humans living at latitudes far from the equator developed light skin in order to help absorb more vitamin D.
People with light type II skin can produce previtamin D3 in their skin at rates 5—10 times faster than dark-skinned type V people. In , anthropologist Nina Jablonski and her husband George Chaplin collected spectrometer data to measure UV radiation levels around the world, and compared it to published information on the skin colour of indigenous populations of more 50 countries. Jablonski went on to prove that people living above the latitudes of 50 degrees have the highest chance of developing vitamin D deficiency.
Genetic studies suggest that light-skinned humans have been selected for multiple times. Some populations who had diets rich in vitamin D were less affected by the evolutionary selection for light skin. Vitamin D3 is available in low quantities in fish and liver.
Some Arctic populations, such as the Inuit , could retain some of their skin pigmentation in areas of low UV radiation. In the spring they receive high levels of UV radiation as reflection from the snow, and their relatively darker skin protects them from the sunlight. There were two other main hypotheses that have been put forward to explain the development of light skin pigmentation: The resistance to cold injury hypothesis claimed that dark skin was selected against in cold climates far from the equator and in higher altitudes as dark skin was more affected by frostbite.
The supposition that dark skin evolved in the absence of selective pressure was put forward by the probable mutation effect hypothesis. The subsequent spread of light skin was thought to be caused by assortive mating  and sexual selection contributed to an even lighter pigmentation in females. Increasingly lighter skinned populations are distributed across areas with incrementally lower levels of UV radiation. Melanin is a derivative of the amino acid tyrosine.
Eumelanin is the dominant form of melanin found in human skin. Melanin is produced in specialized cells called melanocytes , which are found in the lowest level of the epidermis. Humans with naturally occurring light skin have varied amounts of smaller and scarcely distributed eumelanin and its lighter-coloured relative, pheomelanin.
For the same body region, individuals, independently of skin colour, have the same amount of melanocytes however variation between different body parts is substantial , but organelles which contain pigments, called melanosomes, are smaller and less numerous in light-skinned humans.
For people with very light skin, the skin gets most of its colour from the bluish-white connective tissue in the dermis and from the haemoglobin associated blood cells circulating in the capillaries of the dermis. The colour associated with the circulating haemoglobin become more obvious, especially in the face, when arterioles dilate and become tumefied with blood as a result of prolonged physical exercise or stimulation of the sympathetic nervous system usually embarrassment or anger.
The characteristic of fair skin, red hair , and freckling is associated with high amount of pheomelanin, little amounts of eumelanin. This phenotype is caused by a loss-of-function mutation in the melanocortin 1 receptor MC1R gene.
Freckles usually only occur in people with very lightly pigmented skin. They vary from very dark to brown in colour and develop a random pattern on the skin of the individual. This can contribute to premature aging and skin cancer. Normal tanning is usually delayed as it takes time for the melanins to move up in the epidermis.
Heavy tanning does not approach the photoprotective effect against UVR-induced DNA damage compared to naturally occurring dark skin ,   however it offers great protection against seasonal variations in UVR. Gradually developed tan in the spring prevents sunburns in the summer. This mechanism is almost certainly the evolutionary reason behind the development of tanning behaviour.
Whilst not all of these genes directly affect melanin production, most of them code for proteins that may play a significant role in melanogenesis and control melanin concentration. Some of these genes are found to be more prevalent in certain population than others. Skin pigmentation is an evolutionary adaptation to the various UV radiation levels around the world.
There are health implications of light-skinned people living in environments of high UV radiation. Various cultural practices increase problems related to health conditions of light skin, for example sunbathing among the light-skinned.
Humans with light skin pigmentation living in low sunlight environments experience increased vitamin D synthesis compared to humans with dark skin pigmentation due to the ability to absorb more sunlight. Almost every part of the human body, including the skeleton, the immune system, and brain requires vitamin D.
Sunlight is necessary for the production of vitamin D. Vitamin D production in the skin begins when UV radiation penetrates the skin and interacts with a cholesterol-like molecule produce pre-vitamin D3. The farther a place is from the equator, the less UVB is received, and the potential to produce of vitamin D is diminished. Some regions far from the equator do not receive UVB radiation at all between autumn and spring. A form of vitamin D is a potent cell growth inhibitor; thus chronic deficiencies of vitamin D seem to be associated with higher risk of certain cancers.
This is an active topic of cancer research and is still debated. With the increase of vitamin D synthesis, there is a decreased incidence of conditions that are related to common vitamin D deficiency conditions of people with dark skin pigmentation living in environments of low UV radiation: Vitamin D promotes the production of cathelicidin , which helps to defend humans' bodies against fungal, bacterial, and viral infections , including flu.
Light-skinned people living in high sunlight environments are more susceptible to the harmful UV rays of sunlight because of the lack of melanin produced in the skin.
The most common risk that comes with high exposure to sunlight is the increased risk of sunburns. This increased risk has come along with the cultural practice of sunbathing, which is popular among some human populations.
This cultural practice to gain tanned skin if not regulated properly can lead to sunburn, especially among very lightly-skinned humans.
The overexposure to sunlight also can lead to basal cell carcinoma , which is a common form of skin cancer. Another health implication is the depletion of folate within the body, where the overexposure to UV light can lead to megaloblastic anemia. Folate deficiency in pregnant women can be detrimental to the health of their newborn babies in the form of neural tube defects , miscarriages , and spina bifida , a birth defect in which the backbone and spinal canal do not close before birth.
Individuals with lightly pigmented skin who are repeatedly exposed to strong UV radiation, experience faster aging of the skin, which shows in increased wrinkling and anomalies of pigmentation. Oxidative damage causes the degradation of protective tissue in the dermis , which confers the strength of the skin. Taylor, of Yale School of Medicine , concluded that the study could not prove the findings but they suspect the underlying cause.
Light-coloured skin has been suspected to be one of the contributing factors that promote wrinkling. There is a correlation between the geographic distribution of UV radiation and the distribution of skin pigmentation around the world. Areas that are further away from the equator and are generally closer to the poles have lower concentration of UV radiation. As a general rule, populations that evolved north or south of 46 degrees latitude therefore tend to be lighter skinned; for example, in Western Europe, Canada, Russia, Japan, Scandinavia, and Mongolia.
Some archaeologists attribute this to the cultural shortcomings that prevented people from settling down in polar regions. Away from the coastlines it was extremely hard for humans to find great sources of vitamin D. Hinterland populations across Eurasia survive by consuming reindeer , which they follow and herd. Reindeer meat, organs, and fat contain large amounts of vitamin D which the reindeer gets from eating substantial amounts of lichen.
Although the present distribution of human skin colours does not reflect this correlation due to the mass migration and movement of peoples across continents in the past, there are still indigenous peoples living in ancestral environment. These regions were uninhabited by humans until about 12 years ago.
Areas like Scandinavia and Siberia have very low concentrations of ultraviolet radiation, and indigenous populations are all light-skinned. From Wikipedia, the free encyclopedia. Redirected from Light skinned people. Retrieved January 24, Fundamentals of Biological Anthropology. Retrieved 10 December Human biology; an international record of research. Retrieved 22 September Light-skinned people have recessive genes for skin color. Skin Color as an Adaptation. Archived from the original on 18 December Archived from the original on 5 November Annual Review of Anthropology.
Effects of vitamin D on bone and natural selection of skin color: American Journal of Clinical Nutrition. Critical Reviews in Clinical Laboratory Sciences. Journal of Human Evolution. Progress in Biophysics and Molecular Biology. The effect of UVB dose and skin color".
It upset her that people were using these products with the belief that having lighter skin means receiving better treatment by society. This is the reason that we have problems within our country. She is one of your own [yet] she is treated differently. And just like that, Rogers created her own company — she has over 26, followers on Instagram — where, as CEO, she is spreading a positive message about love and confidence. Please read our Commenting Policy first.
May 30, 1: May 30, 5: Flexin' In My Complexion. We had gotten close, well, as close as two year-olds could be. She came to camp one day and told me that her father said we couldn't be friends anymore. He said you're the sneakiest kind of nigger because you never know what side you're on.
I let her walk away and I never spoke about it again. According to him I was the worst kind of nigger because I couldn't pick a side. I never told my mom or anybody because I felt like I couldn't. I never wanted to complain to the women in my family because I thought my struggles would never equate to theirs.
When I was in high school, I had never stared at my mother with as much admiration as I did when I started to hate my skin. Her melanin glowed to me and at a time when some girls my age wanted a boyfriend or bigger breasts, I wanted dark skin like my mother's. I would often look at her and wonder how someone could call her skin ugly or unappealing when I looked at it and saw pure gold. I grew up repulsed by the way my skin left visible acne scars all over my face and the way hair showed so easily on my body.
My skin had became a sheet of just utter hate on my body that I wanted to tear off. I couldn't tell anybody because it was unheard of, you know? You never hear about a little light skinned girl wanting to be dark skinned. It's always the other way around. It's always the little dark girl picking the light skinned baby doll and believing that it is the most complete and fascinating thing in the world. The girls I went to school with growing up didn't like me. I never blamed them though. It wasn't their fault rather what they were taught, maybe by their parents and then from their grandparents and then their grandparent's parents.
They were programmed to believe that my black was beautiful and their's wasn't. It's crazy how they hated me due to my skin tone and due to preconceived notions about me 'thinking I was all that' when I would have traded skin tones with them in a heart beat. Full Cast and Crew. Channsin Berry , Bill Duke. Share this Rating Title: Dark Girls 7. Use the HTML below. You must be a registered user to use the IMDb rating plugin. Learn more More Like This. Chris Rock explores the wonders of African-American hairstyles.
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Emmanuel says this even occurs in school textbooks, where a picture of a fair- skinned girl might be labelled “beautiful” and a darker one “ugly”. But how much of their success is down to the shade of their skin? It's been suggested by some that black women with lighter skin find it easier to. It's a privilege that people with lighter skin tones experience “Even if he's blacker than the skin I'm in, to be with a black girl is this sin.”.