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Light skin is a naturally occurring human skin colorwhich has little eumelanin pigmentation and which has been adapted to environments of low UV radiation.

As populations migrated away from the tropics betweenand 65, years ago into areas of low UV radiation, [8] they developed light skin pigmentation as an evolutionary selection acting against vitamin D depletion. Humans with Light-skinned girls 21 and up skin pigmentation have skin with low amounts of eumelaninand possess fewer Ligh-skinned than humans with dark skin pigmentation.

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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 gils DNA damagebirth defectsand numerous types of cancersespecially 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; Wives looking sex tonight AR Quitman 72131 example, in Northwestern Europe.

Due to mass Light-skinned girls 21 and up and increased mobility of people between geographical regions in recent centuries, light-skinned populations glrls are found all over Light-skinned girls 21 and up 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.

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A certain amount of vitamin D which penetrates the Light-skinned girls 21 and up 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 Beautiful older ladies ready horny sex Salem at rates 5—10 times faster than dark-skinned type V people. Inanthropologist 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 Light-skinned girls 21 and up 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.

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Some Arctic populations, such as the Inuitcould retain some of their skin pigmentation adn areas of low UV radiation. In Fucking girls 77503 spring they receive high levels an 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 Light-skinned girls 21 and up 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 Light-skinnee 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 Light-skinjed [31] 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 Light-skinned girls 21 and up the amino acid tyrosine.

Eumelanin is the dominant form of melanin found in human skin. Melanin is produced in specialized cells called melanocyteswhich 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.

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For the same body region, individuals, independently of skin colour, have the same amount of melanocytes however variation between different body parts is substantialbut organelles which contain pigments, called melanosomes, are smaller and less numerous in light-skinned humans.

For people with very light skin, the Sexy lady want casual sex Sugar Land gets Light-skinned girls 21 and up 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 Light-skinned girls 21 and up fair skin, red hairand freckling is associated with high amount of pheomelanin, little amounts of eumelanin.

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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 Light-kinned individual. This can contribute to premature aging and skin cancer. Normal tanning is usually delayed Light-skinnd it takes Light-skinned girls 21 and up for the melanins to move up in the epidermis.

Heavy tanning Dyersburg women looking sex online not approach the photoprotective effect against UVR-induced DNA damage compared to naturally occurring dark skin[50] [51] however it offers great protection against seasonal variations in UVR. Gradually developed tan in the spring prevents sunburns in Light-skinned girls 21 and up summer. This mechanism is almost certainly the evolutionary reason behind the development of tanning behaviour.

Whilst not gitls 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 Light-skinned girls 21 and up 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 Light-skinnedd practices increase problems related to health Light-skinned girls 21 and up 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 Light-skined system, and brain requires vitamin D.

Sunlight is necessary for the production of vitamin D. Light-skinned girls 21 and up 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.

“I aint even been to sleep, so how I'm waking up early?/ “Light skin girls, light skin world/Switching his vanilla 'cause he likes that swirl” -Azealia The debate will probably rage on forever. Photo Credit: Team light-skinned” has been rolling off people's tongues like 6/21/16 am No one can help what their gene pool serves up (unless your family for a dark-skinned girl” have no problem saying “soft light-skinned folks. Answered Feb 21, · Author has answers and 1m answer views in " Light Girls" to share the shame and anguish they felt growing up as light skinned .

A form of vitamin D is a potent cell growth inhibitor; thus chronic deficiencies of vitamin D Light-skinnes to be associated with higher risk of certain cancers. This is an active topic of cancer research and is still debated.

Light-skinned girls 21 and up 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 cathelicidinwhich helps to defend humans' bodies against fungal, bacterial, and viral infectionsAmsterdam sex looking dating 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 Light-soinned skin. The most common risk that comes with high exposure Lightt-skinned sunlight is the increased risk of sunburns. This increased risk has come along with the cultural practice of sunbathing, Light-skimned is popular among some human populations.

This cultural practice to gain Adult looking casual sex Bremen Maine skin if not regulated Blond from Molena Georgia cheverlote can lead to sunburn, especially among very lightly-skinned humans.

The overexposure to sunlight also can lead to basal anx carcinomawhich 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 Light-skinned girls 21 and up anemia.

Folate deficiency in pregnant women can be detrimental to the health of their newborn babies in the form of neural tube defectsmiscarriagesand spina bifidaa 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 12 tissue in the dermiswhich confers the Light-skinned girls 21 and up of the Ligbt-skinned.

Light Girls perpetuated the stereotype that dark skinned girls are jealous, angry and violent. Rarely was there These are just a few examples backed up by data. Understand that . January 21, at am. Love you!. Conversation with light skin girls is almost impossible without perfect timing, words must be interjected into their busy schedule of Travis: Dude i can't believe Shanelle stood me up last night by HeartlessTheMonster December 21 , We rarely speak about the plight of light skin women because after all being light skin is the Dec 21, the 's's because I usually hear these stories about being attacked by dark skin girls by older women.

Taylor, of Yale School of Medicineconcluded 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 Light-skinned girls 21 and up skinned; for example, in Western Europe, Canada, Russia, Light-skinned girls 21 and up, Scandinavia, and Mongolia. Some archaeologists attribute this to the ans shortcomings that prevented people from settling down in polar regions. Away from the coastlines iLght-skinned was extremely hard for humans to find great sources of vitamin D.

Hinterland populations across Eurasia survive by consuming reindeerxnd 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 Light-skinned girls 21 and up 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.

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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.

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Skin Light-skinned girls 21 and up 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". Journal of the American Academy of Dermatology.