Early humans, like chimpanzees now, had few sweat glands, and most of them were located in the palms of the hand and the soles of the feet. • Lighter skin has a thinner fat layer which can cause a more gaunt appearance with aging. The study found that even short periods of intense sunlight are able to halve folate levels if someone has light skin. [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. 87 (4): 918. doi:10.2307/1857900. [3][20], As humans dispersed from equatorial Africa to low UVR areas and higher altitudes sometime between 120,000 and 65,000 years ago, dark skin posed a disadvantage. Vitamin D deficiency is most common in regions with low sunlight, especially in the winter. Some researchers assumed that melanin protects against skin cancer. • The denser population of melanocytes in darker skin tend to produce a more uneven discoloration with sun exposure. In India, popular skin-bleaching lines target both women and men with dark skin. [35], More recent research has found that human populations over the past 50,000 years have changed from dark-skinned to light-skinned and vice versa. Another possible problem might be discoloration, especially if you have dark skin. Targets Free Radicals/Destroys Free Radicals. 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. [91] The western end of Melanesia from New Guinea through the Solomon Islands were first colonized by humans about 40,000 to 29,000 years ago. Today, darker skin is viewed as fashionable and as a sign of well-being in some societies. Melanin is derivative of the amino acid tyrosine. Mustard oil can stimulate many parts of the body, which can be very beneficial. 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. From the above list, yes it does seem that way but guess what, darker skin has a HUGE advantage over paler skin too – it ages better! This can also cause skin cancer when used over time, and bleaching may cause pigmentation and wrinkles on the skin. BUT lucky with the less prone to aging/wrinkles! [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. Save my name, email, and website in this browser for the next time I comment. As a consequence there are many health implications that are the product of population movements of humans of certain skin pigmentation to new environments with different levels of UVR. Mexican-American women in Arizona, California, and Texas have reportedly suffered mercury poisoning after using whitening creams to bleach their skin. The preference or disfavour for darker skin has varied depending on geographical area and time. [22][30][31][32], A 1978 study examined the effect of sunlight on folate—a vitamin B complex—levels. Though moderate tea consumption is a very healthy choice for most people, exceeding 3–4 cups (710–950 ml) per day could have some negative side effects. 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. It can boost your skin’s moisture, protect from sun damage and diminish wrinkles. [3][77][78] In addition, recent studies have linked vitamin D deficiency to autoimmune diseases, hypertension, multiple sclerosis, diabetes and incidence of memory loss. Eumelanin protects tissues and DNA from the radiation damage of UV light. Read on to see the summary from “Write Your Skin A Prescription For Change by Katie Rodan and Kathy Fields”. In an article written for The Sun and Your Skin … This is why African Americans tend to have a higher bone density compared to other groups of people. A great way to prevent and get rid of ingrowns is the homemade TendSkin receipe that I swear by! The loss of body hair led to the development of dark skin pigmentation, which acted as a mechanism of natural selection against folate depletion, and to a lesser extent, DNA damage. 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. From Light to Dark to Varied [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. i understand the curly hairs, but dark skin ? 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. 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. [35], Skin colour is a polygenic trait, which means that several different genes are involved in determining a specific phenotype. Because of this people with fair skin absorb more of the benefits from UV light. I also have uneven skin tone. [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. Pooja Kannan, 27, from Mumbai, spent years buying cosmetics that promised to lighten her complexion. Light skin girls 5dollars. As natural selection favours individuals with traits of reproductive success, skin cancer had little effect on the evolution of dark skin. Areas that are further away from the equator and generally closer to the poles have a lower concentration of UVR and contain lighter-skinned populations. [104] A pan-India study of Telugu and North Indian castes found a similar correlation between skin color and caste association, linked to the absence of the rs1426654-A variant of the SLC245-A gene, but are also linked to mutations overriding these variants. there are more disadvantages to darker skin? It has been found that folate may have been the driving force behind the evolution of dark skin. [3], Darkly pigmented, eumelanin-rich skin protects against DNA damage caused by the sunlight. [3][10][11][12][13][14][15], Humans with dark skin pigmentation have skin naturally rich in melanin (especially eumelanin), and have more melanosomes which provide superior protection against the deleterious effects of ultraviolet radiation. Premature Aging. Despite early migrations, genetic evidence has pointed out that the indigenous peoples of Australia are genetically very dissimilar to the dark-skinned populations of Africa and that they are more closely related to Eurasian populations. [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. [38][39][40][41][42] The presence of pheomelanin in light skin increases the oxidative stress in melanocytes, and this combined with the limited ability of pheomelanin to absorb UVR contributes to higher skin cancer rates among light-skinned individuals. 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. For example, Wilson et al. Using lemon juice is also inexpensive. [24] Despite this, medium-wave ultraviolet radiation (UVB) damages the immune system even in darker skinned individuals due to its effect on Langerhans cells. • Facial redness, broken capillaries and other flaws tend to show more on lighter skin. 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 ]. I am afraid of exfoliating more often for fear of aggravating my skin…, My skin is very pale and Iam currently expiriencing pimples.gosh I hate how they look(pink of course) and they always leave marks but people say they dont realy ruin my skin rather they look very good on my skin.so proud to be light.and the attention i get from everyone around me is unbelievable. [37] This is associated with lower skin cancer rates among dark-skinned populations. Eumelanin is the dominant form of melanin found in human skin. [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 is the result of human evolution which contributed to variable melanin content in the skin to adapt to certain environments. [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. I am definitely experiencing the cons, though. [100] High levels of skin colour variation exists between different populations in Sub-Saharan Africa. With less hair, sweat could evaporate more easily and cool the bodies of humans faster. Scientists have long assumed that humans evolved melanin in order to absorb or scatter harmful sun radiation. Fact #5: When you have dark skin, you need to approach laser hair removal with caution . Indigenous Mother and daughter from the Urus islands, Peru. [108], Genetic tests show significant Austronesian influence,[109] theorizing that Amazonian Indians and Austronesians both diverged from common ancestor. A few million years of evolution later, early humans had sparse body hair and more than 2 million sweat glands in their body. but when you say “Exfoliate your skin regularly!”, one time a week is it enough ? [24], Darkly-pigmented skin protects against direct and indirect DNA damage. [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. However, a 1999 study failed to find clear indications of a single shared genetic origin between the two populations, suggesting multiple waves of migration into Sahul with distinct ancestries. Skin pigmentation is an evolutionary adaptation to various UVR levels around the world. The skin takes a very large amount of ultraviolet radiation. The skin colour variations are normally distributed from light to dark, as it is usual for polygenic traits. 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 … I’m sure it doesn’t apply to everyone =). [97][98] Dark-skinned groups on the continent have the same receptor protein as Homo ergaster and Homo erectus had. My tip to correct this problem? Melanin is the natural substance that gives color or pigment to the skin, hair and iris of the eye. But the darker your skin, the harder it is to maintain adequate vitamin D. In studies comparing dark and light-skinned residents of northern cities, paler people had higher vitamin D levels throughout the year. People need to realize that “dark” skin is the human norm. Vitamin D is needed to maintain healthy bones and to absorb calcium. Because it is impractical to wear extensive clothing in a watery environment, culture and technology does little to buffer UVR exposure. [35][65] Folate plays an important role in DNA production and gene expression. Serum folate is broken down by UV radiation or alcohol consumption. 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. And thermoregulation agree with the evidence that most of you have dark skin with home remedies and medical.... 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