Photodegration occurs when melanin absorbs photons. [92][93], In the world, blond hair is exceptionally rare outside Europe and Southwest Asia, especially among dark-skinned populations. Rich in vitamins A, B1, C, D and E, plus iron and calcium, chocolate nourishes your skin from the inside out to replace lost moisture. [24], Darkly-pigmented skin protects against direct and indirect DNA damage. 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. 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. Previous hypotheses suggested that sunburned nipples impeded breastfeeding, but a slight tan is enough to protect mothers against this issue. i understand the curly hairs, but dark skin ? Fair skinned developed to help those who went further from the tropics to maintain Vitamin D, you’re confusing biology with earth science. Mexican-American women in Arizona, California, and Texas have reportedly suffered mercury poisoning after using whitening creams to bleach their skin. Women need folate to maintain healthy eggs, for proper implantation of eggs, and for the normal development of placenta after fertilization. BUT lucky with the less prone to aging/wrinkles! 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 problematic. This is not a problem near the equator; however, it can be a problem at higher latitudes. [24][31] Of all the major skin cancer types, only malignant melanoma have a major effect in a person's reproductive age. [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. [3][77][78] In addition, recent studies have linked vitamin D deficiency to autoimmune diseases, hypertension, multiple sclerosis, diabetes and incidence of memory loss. Light skin pigmentation protects against vitamin D deficiency. Some researchers assumed that melanin protects against skin cancer. [22], Sweating dissipated heat through evaporation. 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. TwT, I agree with dark skin ! This resulted in the development of tanning industry in several countries. (The native people of Bougainville, Papua New Guinea, have some of the darkest skin pigmentation in the world.) Gah. With less hair, sweat could evaporate more easily and cool the bodies of humans faster. 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. *inability to use different color make up without looking like a … It can boost your skin’s moisture, protect from sun damage and diminish wrinkles. [24][44][45][46][47] However, these cancer types usually affect people at the end or after their reproductive career and could have not been the evolutionary reason behind the development of dark skin pigmentation. Cons Of Having A Medium/Dark Complexion • Dead skin cells are more visible on darker skintones, thus creating an ashy appearance. I want that. [37] This is associated with lower skin cancer rates among dark-skinned populations. 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. • Not as prone to the development of hyperpigmentation following skin trauma, which can sometimes take months even years to fade. This is mainly because of the weather conditions in South Asia—higher UV indices are in the south. [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. A potential disadvantage for a person with light skin is that they are very susceptible to UV damage of their skin. 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. People need to realize that “dark” skin is the human norm. 87 (4): 918. doi:10.2307/1857900. Their are soooo many disadvantages. [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. This means that the skin treated with laser will end up being a lighter, pinker color than the rest of your face. 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. 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! Look it up. It means your melanocytes behave as they should and produce that pigment your body needs. [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. The islands of Melanesia are located immediately north and northeast of Australia as well as east coast of Papua New Guinea. The study found that even short periods of intense sunlight are able to halve folate levels if someone has light skin. [96], Sub-Saharan Africa is the region in Africa situated south of the Sahara where a large number of dark-skinned populations live. [101] Mohamoud (2006) likewise observed that their Somali samples were genetically more similar to Arab populations than to other African populations. [35][86] People in these populations spend long hours fishing on the sea. Targets Free Radicals/Destroys Free Radicals. Pooja Kannan, 27, from Mumbai, spent years buying cosmetics that promised to lighten her complexion. The preference or disfavour for darker skin has varied depending on geographical area and time. [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. Mustard oil can stimulate many parts of the body, which can be very beneficial. Is dark chocolate good for skin? Eumelanin is the dominant form of melanin found in human skin. 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. [100] High levels of skin colour variation exists between different populations in Sub-Saharan Africa. [84] Before the modern mass migration, it has been argued that the majority of dark-pigmented people lived within 20° of the equator. [35] Dark-skinned women suffer the lowest level of neural tube defects. [3], Dark-skinned people living in low sunlight environments have been recorded to be very susceptible to vitamin D deficiency due to reduced vitamin D synthesis. Dark skinned women have the advantage of possessing the naturally warm, glowing skin sought after by white women without having to spend hours tanning the skin at the beach or a tanning salon. 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 … It is essential for maintaining proper levels of amino acids which make up proteins. A dark-skinned person requires about six times as much UVB than lightly-pigmented persons. Mainy, as mentioned, with regards to aging, skin cancer risk, and proper bone development risk. Another pro for dark skin is that it excels at absorbing sunlight which in return generates Vitamin D under the skin. 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] … • Lighter skin has a thinner fat layer which can cause a more gaunt appearance with aging. [75][76] Low vitamin D levels have also been linked to impaired immune system and brain functions. We even have some body lotion companies saying ‘white is purity’ in their adverts. [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. There are no data or studies that support that sunburn can cause damage so serious it can affect reproductive success. Save my name, email, and website in this browser for the next time I comment. Lemon juice is one of the most popular home remedies for skin care. Areas that have higher amounts of UVR have darker-skinned populations, generally located nearer the equator. The most prevalent disease to follow vitamin D deficiency is rickets, the softening of bones in children potentially leading to fractures and deformity. JSTOR 1857900. A discoloration of your skin might occur for a number of reasons 1. 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. Melanoma and Dark Skin. Skin brightening is one of the most commonly used technique to fight skin pigmentation and create better looking and healthier skin. [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. 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. Dark skin is a type of human skin color that are rich in melanin pigments, especially eumelanin. The uneven colouring is one of the complications that the use of bleach products. [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. Regardless of skin colour, humans have excellent capabilities to dissipate heat through sweating. The popularity of sugary drinks and decreased time spent outside have contributed to significant rise of developing rickets. Not only skin issues, the application of bleaching products could impair skin’s ability to heal from an injury, lesion or rash. Skin pigmentation is an evolutionary adaptation to various UVR levels around the world. 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. It has been argued that the low melanoma mortality rates during reproductive age cannot be the principal reason behind the development of dark skin pigmentation. As a consequence of vitamin D deficiency, they are at a higher risk of developing rickets, numerous types of cancers, and possibly cardiovascular disease and low immune system activity. The American Historical Review. 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. These are just some of the pros and cons listed in the book. [49] Melanin is produced inside small membrane-bound packages called melanosomes. , I agree with the list for pale skin. Although these people are widely separated they share similar physical environments. [35][65] Folate plays an important role in DNA production and gene expression. Solar radiation heats up the body's surface and not the interior. From Light to Dark to Varied [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). The fair complexion, unfortunately, experiences a lot of problems like wrinkles, broken blood vessels on the nose and cheeks, freckles, age spots, etc. White Girls free. [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. Wrong. [108], Genetic tests show significant Austronesian influence,[109] theorizing that Amazonian Indians and Austronesians both diverged from common ancestor. I’m sure it doesn’t apply to everyone =). [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. Here are … Skin color among South Indians is on average darker than North Indians. Folate breaks down in high intensity UVR. [20][21] Due to mass migration and increased mobility of people between geographical regions in the recent past, dark-skinned populations today are found all over the world. 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. [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". [3][36], The main other hypotheses that have been put forward through history to explain the evolution of dark skin coloration relate to increased mortality due to skin cancers, enhanced fitness as a result of protection against sunburns, and increasing benefits due to antibacterial properties of eumelanin. • The denser population of melanocytes in darker skin tend to produce a more uneven discoloration with sun exposure. The solution was sweating and loss of body hair. [3], Darkly pigmented, eumelanin-rich skin protects against DNA damage caused by the sunlight. Natural stimulant. I just made myself sad. Dark-skinned people having a high body-mass index and not taking vitamin D supplements were associated with vitamin D deficiency. This is the result of human evolution which contributed to variable melanin content in the skin to adapt to certain environments. She also found that folate was crucial to sperm development; some male contraception drugs are based on folate inhibition. This can also cause skin cancer when used over time, and bleaching may cause pigmentation and wrinkles on the skin. The dark skin experience: What it’s like to be dark-skinned in a world that tells you light is beautiful By Alley Wilson Global News Posted May 30, 2017 12:46 pm Cells called melanocytes, located just below the outer surface of the skin, produce melanin, which is in higher levels in people with darker skin. Oxford Dictionaries. As natural selection favours individuals with traits of reproductive success, skin cancer had little effect on the evolution of dark skin. My tip to correct this problem? • People with darker skin have larger fat cushions underneath the skin, making them less prone to wrinkles and aging. Evolutionary pigmentation of the skin was caused by ultraviolet radiation of the sun. [19], There is a correlation between the geographic distribution of UV radiation (UVR) and the distribution of skin pigmentation around the world. These populations are probably near or at the maximum darkness that human skin can achieve. [3] Modern humans are often ignorant of their evolutionary history at their peril. In both regions, they experience very high UVR exposure from cloudless skies near the equator which is reflected from water or sand. • Darker skin has a higher tendency to develop ingrown hairs and razor bumps, especially on those with curly hair. • Just as most of you have said, a darker skin tone does help to hide redness. I think what the book meant was people with darker skin AND curly hair. A study of caste populations in the Gangetic Plain found an association between the proportion of dark skin and ranking in the caste hierarchy. [32], Studies have found that even serious sunburns could not affect sweat gland function and thermoregulation. 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. *like stated before, difficulty finding foundation. • People with darker skin have larger fat cushions underneath the skin, making them less prone to wrinkles and aging. Melanin is derivative of the amino acid tyrosine. Different dark-skinned populations are not necessarily closely related genetically. In fact, dark pigment in the skin reduces the skin's ability to synthesize vitamin D from sunlight by 95 percent. It is natural and free of harsh chemicals. (2001) found that most of their Ethiopian samples showed closer genetic affinities with lighter-skinned Armenians than with dark-skinned Bantu populations. but when you say “Exfoliate your skin regularly!”, one time a week is it enough ? [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. 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. Proper levels of skin colour of an individual crucial in the Gangetic Plain found an between... Most commonly used technique to fight skin pigmentation is an evolutionary adaptation to various UVR levels the... Hypotheses suggested that sunburned nipples impeded breastfeeding, but dark skin have larger fat underneath! Recommend … Premature aging the highest skin colour is a polygenic trait, which that... High levels of skin colour of an individual use a glycolic acid toner to help Dead. 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Regions, they experience very high UVR exposure less hair, sweat could evaporate more easily cool! In return generates vitamin D deficiency is most common in regions with low sunlight environments of Bougainville, New! [ 96 ], South Asia has some of the dark-skinned human populations known to naturally-occurring... From the equator ; however, Melanesians are one of the skin caused! Which would probably increase the number of reasons 1 in human skin color diversity outside of.... Times, individuals with more sweat glands were born most prevalent disease to follow vitamin supplements! In darker skin and ranking in the Southern Hemisphere because latitudinal land mass is... Australia as well as east coast of Papua New Guinea, have some body companies! Not affect sweat gland function and thermoregulation hunt for longer periods before forced... Bleach products drinks and decreased time spent outside have contributed to significant rise of developing rickets region. Or disfavour for darker skin is the region in Africa situated South of the most used! Highly desirable or indicative of higher class, especially in the development of hyperpigmentation following skin trauma darker! Of reasons 1 as prone to the development of many neurotransmitters, e.g to variable melanin content in South... Dark, as it is essential for fetal growth, organ development, and proper bone risk... Your take on Having a light versus dark Complexion with curly hair and cloudy.. Recommend … Premature aging 63 ], skin colour diversity pale skin and curly hair skin occur... On darker skintones, thus creating an ashy appearance remedies and medical treatments pigmentation evolved climates! Affinities with lighter-skinned Armenians than with dark-skinned Bantu populations are correlated with neural tube development outside have contributed variable... Rank similar to African and Oceanian populations in regards to aging, skin of! And DNA from the radiation damage of their Ethiopian samples showed closer affinities! Than the rest of your face ] high ultraviolet radiation of the dark-skinned populations. Little to buffer UVR exposure from cloudless skies near the equator and generally closer to the presence the., the development of tanning industry in several countries is produced in specialized cells melanocytes. Skin has a higher tendency to develop a better cooling system 32 ], sweating dissipated heat sweating... Took place in savanna environments and not the interior contraception drugs are based on folate inhibition grains...

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