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All Rights Reserved. Bcl2 and Bcl-w[30] were the first two discovered, then in 2016, the IRF4 (interferon regulatory factor 4) gene was announced after a study of 6,000 people living in five Latin American countries. It changes more slowly under dry oxidizing conditions (such as in burials in sand or in ice) than under wet reducing conditions (such as burials in wood or plaster coffins).[45]. The condition is reversible with proper nutrition. Permanently white hair starting in childhood can be genetically inherited, but unlike albinism, there are no negative medical implications. The most predominant hair color is black. Hair contains a mixture of black-brown-yellow eumelanin and red pheomelanin. [7] In addition, other genetic and environmental factors can affect hair color in humans; for instance, mutations in the melanocortin 1 receptor (MC1R) gene can lead to red or auburn hair,[5] and exposure to ultraviolet radiation can damage hair and alter its pigmentation. Studies in 2012 showed that naturally blond hair of Melanesians is caused by a recessive mutation in tyrosinase-related protein 1 (TYRP1). The Telegraph reports that hair starts graying later than previously thought, and increases progressively with age. [35], The hair color of buried bodies can change. More pheomelanin creates a more golden or strawberry blond color, and more eumelanin creates an ash or sandy blond color. [46] Hair can only be lightened using chemical lighteners, such as bleach. Black Hair. [19][20], Graying is a gradual process; according to a study by L'Oreal, overall, of those between 45 and 65 years old, 74% had some gray hair, covering an average of 27% of their head, and approximately 1 in 10 people had no gray hairs even after the age of 60. Please help us improve. 2. The stem cells at the base of hair follicles produce melanocytes, the cells that produce and store pigment in hair and skin. These however, are just stereotypes and shouldn’t be taken seriously as hair color does not necessarily effect someone’s personality. The hair is often white or pale blond. [29] Thus, a single hair cannot be white on the root side, and colored on the terminal side. In some cases, gray hair may be caused by thyroid deficiencies, Waardenburg syndrome or a vitamin B12 deficiency. Much remains to be learned about the physiology of human graying. Brunettes are. In addition to age, some medical conditions also turn hair color to grey or white. Semi-permanent hair color cannot lighten hair. Vitamins and minerals that are known to slow down the graying process are vitamin B-12, C, D, H (Biotin), and the mineral iron. Since vitiligo can cause eyelashes to turn white, the same process is believed to be involved in hair on the head (and elsewhere) due to aging. The most common hair color in the world is black and its found in wide array of background and ethnicities. Gray hair color typically occurs naturally as people age (see aging or achromotrichia below). Permanent hair color means that the hair's structure has been chemically altered until it is eventually cut away. Sometimes people are born with gray hair because they inherit the trait. Brown hair is the second most common human hair color, after black. Hair color can be changed by a chemical process. Semi-permanent color washes out over a period of time—typically four to six weeks, so root regrowth is less noticeable. blond hair is most commonly found in Northern and Western Europeans and their descendants but can be found spread around most of Europe. ], The anti-cancer drug imatinib has recently been shown to reverse the graying process. Jan 06 06, 7:37 PM Black hair is also common in Eastern Europe, Southern Europe, and Latin America. In general, men gray more than women; 78 percent among men and 71 percent among women have gray hair. © 2006-2020 LoveToKnow, Corp., except where otherwise noted. However, nearly 50 percent of women in 2017 said they preferred to stick with their natural hair color due to health concerns arising from the chemicals used in dyes. Considered on a global scale: Evolution is one of the main reasons for the difference in hair color seen around the world.

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