[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.montres.cz\/jak-se-u-lidi-objevila-svetla-pokozka\/#Article","mainEntityOfPage":"https:\/\/www.montres.cz\/jak-se-u-lidi-objevila-svetla-pokozka\/","headline":"Jak se u lid\u00ed objevila sv\u011btl\u00e1 poko\u017eka","name":"Jak se u lid\u00ed objevila sv\u011btl\u00e1 poko\u017eka","description":"Kol\u00e9bkou na\u0161eho druhu je Afrika, konkr\u00e9tn\u011b jej\u00ed savany. Nen\u00ed tedy divu, \u017ee prap\u016fvodn\u00ed barva k\u016f\u017ee \u010dlov\u011bka je \u010dern\u00e1. Dnes v\u0161ak m\u00e1me mnoho variant, p\u0159i\u010dem\u017e, alespo\u0148 mimo Afriku, p\u0159evl\u00e1d\u00e1 b\u00edl\u00e1. Je pak zaj\u00edmav\u00e9 se pod\u00edvat, pro\u010d se u n\u00e1s vlastn\u011b vyvinula. Koneckonc\u016f, p\u0159\u00edroda ned\u011bl\u00e1 nic n\u00e1hodou, a tento trend by se neroz\u0161\u00ed\u0159il, kdyby nep\u0159in\u00e1\u0161el n\u011bjakou evolu\u010dn\u00ed […]","datePublished":"2022-12-24","dateModified":"2023-11-25","author":{"@type":"Person","@id":"https:\/\/www.montres.cz\/author\/#Person","name":"","url":"https:\/\/www.montres.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/06473a178d94fb830b46e277369729e9534f2612e261ec2f1ee96b672ef473e2?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/06473a178d94fb830b46e277369729e9534f2612e261ec2f1ee96b672ef473e2?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"montres.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.montres.cz\/wp-content\/uploads\/art473942_4x3_20261002_044240_OcnxAP.jpg","url":"https:\/\/www.montres.cz\/wp-content\/uploads\/art473942_4x3_20261002_044240_OcnxAP.jpg","height":0,"width":0},"url":"https:\/\/www.montres.cz\/jak-se-u-lidi-objevila-svetla-pokozka\/","about":["V\u011bda"],"wordCount":461,"articleBody":"\tKol\u00e9bkou na\u0161eho druhu je Afrika, konkr\u00e9tn\u011b jej\u00ed savany. Nen\u00ed tedy divu, \u017ee prap\u016fvodn\u00ed barva k\u016f\u017ee \u010dlov\u011bka je \u010dern\u00e1. Dnes v\u0161ak m\u00e1me mnoho variant, p\u0159i\u010dem\u017e, alespo\u0148 mimo Afriku, p\u0159evl\u00e1d\u00e1 b\u00edl\u00e1. Je pak zaj\u00edmav\u00e9 se pod\u00edvat, pro\u010d se u n\u00e1s vlastn\u011b vyvinula. Koneckonc\u016f, p\u0159\u00edroda ned\u011bl\u00e1 nic n\u00e1hodou, a tento trend by se neroz\u0161\u00ed\u0159il, kdyby nep\u0159in\u00e1\u0161el n\u011bjakou evolu\u010dn\u00ed v\u00fdhodu. Ale jakou?\tPro odpov\u011b\u010f se mus\u00edme vr\u00e1tit do doby, kdy na\u0161i p\u0159edci poprv\u00e9 opustili \u010dern\u00fd kontinent. Najednou se ocitli v\u00a0chladn\u011bj\u0161\u00edm prost\u0159ed\u00ed, kde je slune\u010dn\u00ed svit m\u00e9n\u011b intenzivn\u00ed a v\u00a0zim\u011b je ho minimum. P\u0159itom pr\u00e1v\u011b Slunce je d\u016fle\u017eit\u00e9 pro synt\u00e9zu vitaminu D.\tBylo zde tedy pot\u0159eba naj\u00edt novou rovnov\u00e1hu mezi ochranou p\u0159ed \u0161kodliv\u00fdm z\u00e1\u0159en\u00edm a z\u00e1rove\u0148 umo\u017enit, aby byl tento vitamin syntetizov\u00e1n. A zat\u00edmco v\u00a0Africe bylo nutn\u00e9 d\u00e1t v\u011bt\u0161\u00ed d\u016fraz pr\u00e1v\u011b na ochranu, v\u00a0severn\u011bj\u0161\u00edch poloh\u00e1ch byly d\u016fle\u017eit\u011bj\u0161\u00ed vitaminy.\tV\u00a0d\u016fsledku toho za\u010dali l\u00e9pe prosperovat d\u011bti, kter\u00e9 m\u011bly pon\u011bkud sv\u011btlej\u0161\u00ed ple\u0165. Ty se tak\u00e9 nej\u010dast\u011bji do\u017e\u00edvaly dosp\u011blosti, a sv\u00e9 geny pak p\u0159edaly dal\u0161\u00edm generac\u00edm. Z\u00a0nich pak op\u011bt p\u0159e\u017eili nejl\u00e9pe ti, kte\u0159\u00ed m\u011bli nejsv\u011btlej\u0161\u00ed ple\u0165. B\u011bhem mnoha generac\u00ed jsme se tak dostali a\u017e k\u00a0barv\u011b, kterou m\u00e1me dnes.\tSamoz\u0159ejm\u011b v\u00a0dne\u0161n\u00ed dob\u011b, kdy m\u00e1me jednak vitaminov\u00e9 dopl\u0148ky a tak\u00e9 r\u016fzn\u00e9 prost\u0159edky na ochranu k\u016f\u017ee, je jej\u00ed barva irelevantn\u00ed. Je v\u0161ak o genetick\u00fd znak tak hluboko zak\u00f3dovan\u00fd, \u017ee p\u016fsob\u00ed i dnes, v\u010detn\u011b jedn\u00e9 z\u00a0jeho adaptac\u00ed, kdy se p\u0159i siln\u011bj\u0161\u00edm sv\u011btle vytv\u00e1\u0159\u00ed v\u00edce melaninu, zat\u00edmco p\u0159i m\u00e9n\u011b intenzivn\u00edm jej m\u00e1me m\u00e9n\u011b. Tento proces zn\u00e1me jako opalov\u00e1n\u00ed, av\u0161ak ve skute\u010dnosti se n\u00e1s na\u0161e t\u011blo sna\u017e\u00ed (zdaleka ne v\u017edy \u00fasp\u011b\u0161n\u011b) ochr\u00e1nit p\u0159ed radioaktivn\u00edm z\u00e1\u0159en\u00edm, kter\u00e9 by n\u00e1m mohlo zp\u016fsobit rakovinu k\u016f\u017ee.\t\tJist\u011b, nebyl by to probl\u00e9m, kdybychom z\u016fst\u00e1vali v\u00a0klimatick\u00fdch podm\u00ednk\u00e1ch, pro kter\u00e9 je na\u0161e poko\u017eka vhodn\u00e1. Mnoho z\u00a0n\u00e1s v\u0161ak \u010dasto cestuje, zvl\u00e1\u0161t\u011b do ji\u017en\u011bj\u0161\u00edch krajin, kde je Slunce mnohem intenzivn\u011bj\u0161\u00ed, a t\u011blo jej nest\u00edh\u00e1 kompenzovat. Proto bychom m\u011bli v\u017edy myslet na svou ochranu. Rakovina k\u016f\u017ee toti\u017e nen\u00ed nic p\u0159\u00edjemn\u00e9ho.                                                                                                                                                                                                                                                                                                                                                                                        5\/5 - (1 vote)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Jak se u lid\u00ed objevila sv\u011btl\u00e1 poko\u017eka","item":"https:\/\/www.montres.cz\/jak-se-u-lidi-objevila-svetla-pokozka\/#breadcrumbitem"}]}]