[84] Before the modern mass migration, it has been argued that the majority of dark-pigmented people lived within 20° of the equator. Although these people are widely separated they share similar physical environments. We even have some body lotion companies saying ‘white is purity’ in their adverts. [103] Several genetic surveys of South Asian populations in different regions have found a weak negative correlation between social status and skin darkness, represented by the melanin index. Free radicals have been implicated as the cause of widespread damage to human cells. [35] The antimicrobial hypothesis also does not explain why some populations (like the Inuit or Tibetans) who live far from the tropics and are exposed to high UVR have darker skin pigmentation than their surrounding populations. [43] The damaging effect of UVR on DNA structure and the entailing elevated skin cancer risk is widely recognized. [101] Mohamoud (2006) likewise observed that their Somali samples were genetically more similar to Arab populations than to other African populations. there are more disadvantages to darker skin? Darkly-pigmented people tend to exhibit fewer signs of aging in their skin than the lightly-pigmented because their dark skin protects them from most photoaging. Keratocytes from dark skin cocultured with melanocytes give rise to a melanosome distribution pattern characteristic of dark skin. This accounts for the fact that dark-skinned people get visibly darker after one or two weeks of sun exposure, and then lose their colour after months when they stay out of the sun. These differences depend in part on general distance from the equator, illustrating the complex interactions of evolutionary forces which have contributed to the geographic distribution of skin color at any point of time. [3][22][23], Due to natural selection, people who lived in areas of intense sunlight developed dark skin colouration to protect against ultraviolet (UV) light, mainly to protect their body from folate depletion. Serum folate is broken down by UV radiation or alcohol consumption. There are certain ingredients in these products that worsen age spots or give a dark shade to your skin. I want that. 6. These qualities of dark skin enhance the barrier protection function of the skin. In fact, dark pigment in the skin reduces the skin's ability to synthesize vitamin D from sunlight by 95 percent. TwT, I agree with dark skin ! This resulted in the development of tanning industry in several countries. Melanin is derivative of the amino acid tyrosine. Folate is needed for normal sperm production in men. [24] The effect of sunlight on folic acid levels has been crucial in the development of dark skin. A study of caste populations in the Gangetic Plain found an association between the proportion of dark skin and ranking in the caste hierarchy. [3][25], The earliest primate ancestors of modern humans most likely had light skin, like our closest modern relative—the chimpanzee. Nina Jablonski, a professor of anthropology and expert on evolution of human skin coloration,[33] found several cases in which mothers' visits to tanning studios were connected to neural tube defects in early pregnancy. This helps the body to retain its folate reserves and protects against damage to DNA. [5][6][7][8], The evolution of dark skin is believed to have begun around 1.2 million years ago,[9] in light-skinned early hominid species after they moved from the equatorial rainforest to the sunny savannas. Over four years of use, she says her skin did lighten up a little, but wonders whether that was due to the cream or her taking more care when going out in t… The skin takes a very large amount of ultraviolet radiation. [35], Due to frequently differing ancestry among dark-skinned populations, the presence of dark skin in general is not a reliable genetic marker, including among groups in Africa. [3] For the same body region, light- and dark-skinned individuals have similar numbers of melanocytes (there is considerable variation between different body regions), but pigment-containing organelles, called melanosomes, are larger and more numerous in dark-skinned individuals. Melanin is produced in specialized cells called melanocytes, which are found at the lowest level of the epidermis. • Facial redness, broken capillaries and other flaws tend to show more on lighter skin. Again, exfoliation is the key here. [35] For humans with dark skin in climates of low UVR, it can take about two hours to produce the same amount of vitamin D as humans with light skin produce in 15 minutes. Blemishes are nothing but dark spots on skin it can be cured by eating more of vitamin food and if required one can apply cream recommended by a Doctor. [3][100][25], Earliest European colonial descriptions of North American populations include terms such as "brown", "tawny" or "olive", though some populations were also described as "light-skinned". Women need folate to maintain healthy eggs, for proper implantation of eggs, and for the normal development of placenta after fertilization. The preference or disfavour for darker skin has varied depending on geographical area and time. [61][62][63], Skin pigmentation is an evolutionary adaptation to various UVR levels around the world. This is problematic. [50][51] A four-fold difference in naturally-occurring dark skin gives seven- to eight-fold protection against DNA damage,[51] but even the darkest skin colour cannot protect against all damage to DNA. A larger percentage of dark-skinned people are found in the Southern Hemisphere because latitudinal land mass distribution is disproportionate. [24], Although darkly-pigmented skin absorbs about 30 to 40% more sunlight than lightly-pigmented skin, dark skin does not increase the body's internal heat intake in conditions of intense solar radiation. • Lighter skin has a thinner fat layer which can cause a more gaunt appearance with aging. These are just some of the pros and cons listed in the book. [87], The Aborigines of Australia, as with all humans, are descendants of African migrants, and their ancestors may have been among the first major groups to leave Africa around 50,000 years ago. Light skin girls 5dollars. According to Nina Jablonski, darkly-pigmented modern populations in South India and Sri Lanka are an example of this, having re-darkened after their ancestors migrated down from areas much farther north. Light skin is most commonly found amongst the native populations of Europe and Northeast Asia as measured through skin reflectance. Pros Of Having A Medium/Dark Complexion Best to use fresh lemon juice. [3][16], Dark-skinned people who live in high latitudes with mild sunlight are at an increased risk—especially in the winter—of vitamin D deficiency. *like stated before, difficulty finding foundation. BUT lucky with the less prone to aging/wrinkles! Genetic evidence also supports this notion, demonstrating that around 1.2 million years ago there was a strong evolutionary pressure which acted on the development of dark skin pigmentation in early members of the genus Homo. Not only skin issues, the application of bleaching products could impair skin’s ability to heal from an injury, lesion or rash. (2001) found that most of their Ethiopian samples showed closer genetic affinities with lighter-skinned Armenians than with dark-skinned Bantu populations. And of course a dramatic decrease in risk for skin cancer. Due to the heavily melanised melanosomes in darkly-pigmented skin, it can absorb more energy from UVR and thus offers better protection against sunburns and by absorption and dispersion UV rays. Eumelanin protects tissues and DNA from the radiation damage of UV light. The skin colour variations are normally distributed from light to dark, as it is usual for polygenic traits. In an article written for The Sun and Your Skin … May cause cancer. [1][2][3] People with very dark skin are often referred to as "black people",[4] although this usage can be ambiguous in some countries where it is also used to specifically refer to different ethnic groups or populations. [24] The present distribution of skin colour variation does not completely reflect the correlation of intense UVR and dark skin pigmentation due to mass migration and movement of peoples across continents in the recent past. [106] Most North American indigenous populations rank similar to African and Oceanian populations in regards to the presence of the allele Ala111. [3], Dark skin offers great protection against UVR because of its eumelanin content, the UVR-absorbing capabilities of large melanosomes, and because eumelanin can be mobilized faster and brought to the surface of the skin from the depths of the epidermis. There are no data or studies that support that sunburn can cause damage so serious it can affect reproductive success. [24] Despite this, medium-wave ultraviolet radiation (UVB) damages the immune system even in darker skinned individuals due to its effect on Langerhans cells. Folate also plays an important role in the development of many neurotransmitters, e.g. This is why African Americans tend to have a higher bone density compared to other groups of people. [49] Melanin is produced inside small membrane-bound packages called melanosomes. It was harder to get food in the hot savannas and as mammalian brains are prone to overheating—5 or 6 °C rise in temperature can lead to heatstroke—so there was a need for the development of better heat regulation. If you are starting to experience age spots, or have dark areas on the skin, a mixture of the oil applied frequently is very effective for skin lightening. Having more melanin in your skin means that you have a little more protection from the sun, and you may be less prone to premature signs of aging. Natural stimulant. A combination of protein-heavy diets and summer snow reflection have been speculated as favouring the retention of pigmented skin. This disease in the past was commonly found among dark-skinned Americans of the southern part of the United States who migrated north into low sunlight environments. [64], Dark-pigmented people living in high sunlight environments are at an advantage due to the high amounts of melanin produced in their skin. Folate breaks down in high intensity UVR. serotonin which regulates appetite, sleep, and mood. Regardless of skin colour, humans have excellent capabilities to dissipate heat through sweating. Lemon juice is one of the most popular home remedies for skin care. [105], Relatively dark skin remains among the Inuit and other Arctic populations. Many genes work together in complex, additive, and non-additive combinations to determine the skin colour of an individual. but when you say “Exfoliate your skin regularly!”, one time a week is it enough ? Cook-Bolden believes that contrary to its bad rep, laser hair removal is actually one of the safest options as long as you approach your laser with caution. Skin tone is associated with a form of discrimination called colorism, which is the practice of assigning cultural privilege and disadvantage based on the color of one’s skin. Solar radiation heats up the body's surface and not the interior. This is remarkable given that the number of polymorphisms for almost all genes in the human gene pool is greater in African samples than in any other geographic region. In both regions, they experience very high UVR exposure from cloudless skies near the equator which is reflected from water or sand. For example, Wilson et al. Reference SNP(refSNP) Cluster Report: rs1426654 **clinically associated** Archived 5 December 2017 at the Wayback Machine.. Ncbi.nlm.nih.gov (30 December 2008). Cons Of Having A Light Complexion An advantage of having darker skin, is that dark skin people have melanin which is a permanent sunscreen, this can reduce the risk of getting skin cancer, a disadvantage of having dark skin is that it increases susceptibility of osteoporosis. Mainy, as mentioned, with regards to aging, skin cancer risk, and proper bone development risk. Don’t believe me? My tip to correct this problem? She also found that folate was crucial to sperm development; some male contraception drugs are based on folate inhibition. Fact #5: When you have dark skin, you need to approach laser hair removal with caution . [3][17] However, some recent studies have questioned if the thresholds indicating vitamin D deficiency in light-skinned individuals are relevant for dark-skinned individuals, as they found that, on average, dark-skinned individuals have higher bone density and lower risk of fractures than lighter-skinned individuals with the same levels of vitamin D. This is possibly attributed to lower presence of vitamin D binding agents (and thus its higher bioavailability) in dark-skinned individuals. Yesterday, I asked you ladies to share your take on having a light versus dark complexion. [100] High levels of skin colour variation exists between different populations in Sub-Saharan Africa. [60] The Ala111Thr or rs1426654 polymorphism in the coding region of the SLC24A5 gene reaches fixation in Europe, and is also common among populations in North Africa, the Horn of Africa, West Asia, Central Asia and South Asia. No wonder, I came across an advert in which a Chinese lady put a dark man into a washing machine and the end result was a white man whom she adored. Type dark skin or light skin into Twitter and you will seecolourismin action. [99] According to scientific studies, populations in Africa also have the highest skin colour diversity. In these abnormalities children are born with an incomplete brain or spinal cord. Rickets is caused by reduced vitamin D synthesis that causes an absence of vitamin D, which then causes the dietary calcium to not be properly absorbed. Gah. It has been found that folate may have been the driving force behind the evolution of dark skin. Only 100–200 generations ago, the ancestors of most people living today likely also resided in a different place and had a different skin color. I just made myself sad. Due to their similar phenotype and the location of New Guinea being in the migration route taken by Indigenous Australians, it was generally believed that Papuans and Aboriginal Australians shared a common origin. Flaws like redness & scars show up really obvious. This is the result of human evolution which contributed to variable melanin content in the skin to adapt to certain environments. [24] The stratum corneum of people with dark or heavily tanned skin is more condensed and contains more cornified cell layers than in lightly-pigmented humans. However, researchers have since observed that changes in skin coloration can happen in as little as 100 generations (~2,500 years), with no intermarriage required. Skin color among South Indians is on average darker than North Indians. Higher amount of vitamin D intake for dark-skinned people living in regions with low levels of sunlight are advised by doctors to follow a vitamin D-rich diet or take vitamin D supplements,[22][79][80][81][82][83] although there is recent evidence that dark-skinned individuals are able to process vitamin D more efficiently than lighter-skinned individuals so may have a lower threshold of sufficiency. • Following trauma, darker skin is more prone to keloid-type scars and post-infammatory hyperpigmentation. [34][35] Populations with light skin pigmentation evolved in climates of little sunlight. [24] Dark-skinned populations inhabiting Africa, Australia, Melanesia, Papua New Guinea and South Asia all live in some of the areas with the highest UV radiation in the world, and have evolved very dark skin pigmentations as protection from the sun's harmful rays. Water reflects, depending on colour, about 10 to 30% of UVR that falls on it. [18][19], The global distribution of generally dark-skinned populations is strongly correlated with the high ultraviolet radiation levels of the regions inhabited by them. Generally, we’ve been made to believe that a light skin person is more acceptable in the society. • People with darker skin have larger fat cushions underneath the skin, making them less prone to wrinkles and aging. [35] Dark-skinned women suffer the lowest level of neural tube defects. Here are … [75][76] Low vitamin D levels have also been linked to impaired immune system and brain functions. 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