It is known that dark-skinned people who have moved to climates of limited sunlight can develop vitamin D-related conditions such as rickets, and different forms of cancer. Fact #5: When you have dark skin, you need to approach laser hair removal with caution . [24][31] Of all the major skin cancer types, only malignant melanoma have a major effect in a person's reproductive age. Pros Of Having A Medium/Dark Complexion Low folate levels are correlated with neural tube defects, such as anencephaly and spina bifida. I just made myself sad. Mexican-American women in Arizona, California, and Texas have reportedly suffered mercury poisoning after using whitening creams to bleach their skin. The skin takes a very large amount of ultraviolet radiation. Light skin is most commonly found amongst the native populations of Europe and Northeast Asia as measured through skin reflectance. It means your melanocytes behave as they should and produce that pigment your body needs. [52][53] Melanosomes are not in aggregated state in darkly pigmented skin compared to lightly pigmented skin. Slaughter-Acey also checked to see how prenatal care use possibly varied across African American women with light brown, medium brown, or dark brown skin complexions. Is dark chocolate good for skin? [100] High levels of skin colour variation exists between different populations in Sub-Saharan Africa. [24] The effect of sunlight on folic acid levels has been crucial in the development of dark skin. [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. [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. [58] Variations in the SLC24A5 gene account for 20–25% of the variation between dark- and light-skinned populations of Africa,[59] and appear to have arisen as recently as within the last 10,000 years. [61][62][63], Skin pigmentation is an evolutionary adaptation to various UVR levels around the world. 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. Dark-skinned people having a high body-mass index and not taking vitamin D supplements were associated with vitamin D deficiency. [22][27] They not only had to cope with more intense sunlight but had to develop a better cooling system. Although these people are widely separated they share similar physical environments. [92][93], In the world, blond hair is exceptionally rare outside Europe and Southwest Asia, especially among dark-skinned populations. The American Historical Review. [19], There is a correlation between the geographic distribution of UV radiation (UVR) and the distribution of skin pigmentation around the world. Their less pigmented skin let in more rays. Vitamin D deficiency is most common in regions with low sunlight, especially in the winter. • People with darker skin have larger fat cushions underneath the skin, making them less prone to wrinkles and aging. [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. Vaughan, Alden T. (1 October 1982). Lighter-skinned people can get enough vitamin D after 10 to 15 minutes of sun exposure a few times a week, but people with dark complexions may need five to 10 times more sun exposure to synthesize that same amount of vitamin D [source: Zelman ]. [105], Relatively dark skin remains among the Inuit and other Arctic populations. [84] Before the modern mass migration, it has been argued that the majority of dark-pigmented people lived within 20° of the equator. "From White Man to Redskin: Changing Anglo-American Perceptions of the American Indian". [22][24] Evolution has restricted humans with darker skin in tropical latitudes, especially in non-forested regions, where ultraviolet radiation from the sun is usually the most intense. [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. Outside the tropics UVR has to penetrate through a thicker layer of atmosphere, which results in most of the intermediate wavelength UVB reflected or destroyed en route; because of this there is less potential for vitamin D biosynthesis in regions far from the equator. [107], Native South Americans and Mesoamericans are also typically considered dark-skinned, ranking similarly to African and Oceanian populations in regards to Ala111 presence. [66][67] Vitamin D plays an important role in regulating the human immune system and chronic deficiencies in vitamin D can make humans susceptible to specific types of cancers and many kinds of infectious diseases. Like many dark-skinned women of color, I have sadly grown accustomed to phrases like "you're pretty for a dark-skinned girl," rap lyrics exalting "red bones," and an overall society that privileges light-skinned African Americans -- from the media and corporate offices to … A larger percentage of dark-skinned people are found in the Southern Hemisphere because latitudinal land mass distribution is disproportionate. (2001) found that most of their Ethiopian samples showed closer genetic affinities with lighter-skinned Armenians than with dark-skinned Bantu populations. 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. [22][28][29], Hairless skin, however, is particularly vulnerable to be damaged by ultraviolet light and this proved to be a problem for humans living in areas of intense UV radiation, and the evolutionary result was the development of dark-coloured skin as a protection. TwT, I agree with dark skin ! Yesterday, I asked you ladies to share your take on having a light versus dark complexion. ISSN 0002-8762. Type dark skin or light skin into Twitter and you will seecolourismin action. • The denser population of melanocytes in darker skin tend to produce a more uneven discoloration with sun exposure. I know a girl; HBCU alum, short, cute, light-skinned, nice ass, huge tits and … [37] This is associated with lower skin cancer rates among dark-skinned populations. , I agree with the list for pale skin. • Facial redness, broken capillaries and other flaws tend to show more on lighter skin. Previous research by Elias and colleagues found that the pH of skin in darkly pigmented individuals is substantially lower than that of their fair-skinned counterparts—the surface of … • Not as prone to the development of hyperpigmentation following skin trauma, which can sometimes take months even years to fade. Regardless of skin tone, dermatologists recommend … The skin colour variations are normally distributed from light to dark, as it is usual for polygenic traits. As a younger person with dark skin, I’m still waiting to see those pros! 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. The circulatory, digestive and excretory systems all react when the oil is used. It is usually done using commercial skin brightening creams although it can also be achieved through various medical processes like chemical peeling or using homemade products such as lemon. This is not a problem near the equator; however, it can be a problem at higher latitudes. Many genes work together in complex, additive, and non-additive combinations to determine the skin colour of an individual. [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. This does not take into account the effects of epistasis, which would probably increase the number of related genes. serotonin which regulates appetite, sleep, and mood. 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. [26] About 7 million years ago human and chimpanzee lineages diverged, and between 4.5 and 2 million years ago early humans moved out of rainforests to the savannas of East Africa. This hypothesis is not consistent with the evidence that most of the hominid evolution took place in savanna environments and not in tropical rainforests. [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. These are just some of the pros and cons listed in the book. Read on to see the summary from “Write Your Skin A Prescription For Change by Katie Rodan and Kathy Fields”. [34][35] Populations with light skin pigmentation evolved in climates of little sunlight. Water reflects, depending on colour, about 10 to 30% of UVR that falls on it. With less hair, sweat could evaporate more easily and cool the bodies of humans faster. [22][30][31][32], A 1978 study examined the effect of sunlight on folate—a vitamin B complex—levels. Other times, though, discolorations can be a cause for concern and may indicate more serious trouble on the horizon. [35][86] People in these populations spend long hours fishing on the sea. 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. [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. [94][95], The indigenous Papuan people of New Guinea have dark skin pigmentation and have inhabited the island for at least 40,000 years. Keratocytes from dark skin cocultured with melanocytes give rise to a melanosome distribution pattern characteristic of dark skin. [75][76] Low vitamin D levels have also been linked to impaired immune system and brain functions. [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. (The native people of Bougainville, Papua New Guinea, have some of the darkest skin pigmentation in the world.) Vitamin D is needed to maintain healthy bones and to absorb calcium. • Dead skin cells are more visible on darker skintones, thus creating an ashy appearance. 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. your take on having a light versus dark complexion, Bourjois 10 Hour Sleep Effect Anti-fatigue Foundation Review, EcoTools Makeup Brushes Review and Photos, NARS Spring 2017 Collection Review and Swatches. Folate is used in the formation of myelin, the sheath that covers nerve cells and makes it possible to send electrical signals quickly. This is mainly because of the weather conditions in South Asia—higher UV indices are in the south. Impaired healing. [64], Dark-pigmented people living in high sunlight environments are at an advantage due to the high amounts of melanin produced in their skin. [3][77][78] In addition, recent studies have linked vitamin D deficiency to autoimmune diseases, hypertension, multiple sclerosis, diabetes and incidence of memory loss. This was in part due to the reduced pressure from UVR skin damage, but also because black skin became a disadvantage, possibly because [pale skin is better at generating vitamin D] … Recent research suggest that the photoprotective effect of dark skin is increased by the fact that melanin can capture free radicals, such as hydrogen peroxide, which are created by the interaction of UVR and layers of the skin. Cons Of Having A Light Complexion [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. 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. [56][57], Skin colour seems to vary mostly due to variations in a number of genes of large effect as well as several other genes of small effect (TYR, TYRP1, OCA2, SLC45A2, SLC24A5, MC1R, KITLG and SLC24A4). [107] High ultraviolet radiation levels occur throughout the Andes region of Peru, Bolivia, Chile, and Argentina. it is true that redness easily shows on pale skin. Premature Aging. Flaws like redness & scars show up really obvious. Exfoliate regularly! These humans could search for food and hunt for longer periods before being forced back to the shades. 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