{"id":82589,"date":"2019-01-25T10:12:46","date_gmt":"2019-01-25T10:12:46","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/witamina-a\/"},"modified":"2019-01-25T10:12:46","modified_gmt":"2019-01-25T10:12:46","slug":"witamina-a","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/pl\/wiki\/witamina-a\/","title":{"rendered":"Witamina A"},"content":{"rendered":"<h2 id=\"czym-jest-witamina-a\">Czym jest witamina A?<\/h2>\n<p>Witamina A, czyli retinol, jest cz\u0119\u015bci\u0105 rozpuszczalnych w t\u0142uszczach zwi\u0105zk\u00f3w, kt\u00f3re znajduj\u0105 si\u0119 w w\u0105trobie i w razie potrzeby s\u0105 uwalniane w ma\u0142ych dawkach. Dlatego te\u017c nie jest konieczne regularne ich przyjmowanie, na przyk\u0142ad poprzez spo\u017cywanie \u017cywno\u015bci.<\/p>\n<p>Istnieje co najmniej 1500 r\u00f3\u017cnych rodzaj\u00f3w witaminy A, takich jak retinoidy, znane jako retinol, retinal, kwas retinowy i zwi\u0105zki pokrewne.<\/p>\n<h2 id=\"jaka-jest-rola-witaminy-a\">Jaka jest rola witaminy A?<\/h2>\n<p>Witamina A lub retinol maj\u0105 podstawowe znaczenie, ze wzgl\u0119du na ich prekursory, karotenoidy. Karotenoidy s\u0105 cz\u0119\u015bci\u0105 rodopsyny, substancji siatk\u00f3wki, kt\u00f3ra chroni oczy przed wra\u017cliwo\u015bci\u0105 na \u015bwiat\u0142o.<\/p>\n<p>Witamina A wp\u0142ywa r\u00f3wnie\u017c na si\u0142\u0119 i rozw\u00f3j ko\u015bci (wzrost z\u0119b\u00f3w) i wyr\u00f3\u017cnia si\u0119 zdolno\u015bci\u0105 do zapewniania odporno\u015bci immunologicznej w ciele. Niedawne odkrycia naukowe wykaza\u0142y, \u017ce witamina A ma tak\u017ce zdolno\u015bci antynowotworowe.<\/p>\n<h2 id=\"jakie-pokarmy-sa-bogate-w-witamine-a\">Jakie pokarmy s\u0105 bogate w witamin\u0119 A?<\/h2>\n<p>Witamina A, czy te\u017c retinol, wyst\u0119puje g\u0142\u00f3wnie w \u017cywno\u015bci pochodzenia zwierz\u0119cego, takiej jak w\u0105tr\u00f3bka, produkty mleczne (mleko, mas\u0142o i ser) oraz jaja.<\/p>\n<p>Wyst\u0119puje r\u00f3wnie\u017c w owocach i warzywach, takich jak morele, marchew, arbuz, jagody i pomidory (w produktach o czerwonym, \u017c\u00f3\u0142tym oraz pomara\u0144czowym kolorze).<\/p>\n<p>Witamina A jest wra\u017cliwa na ciep\u0142o, a jej w\u0142a\u015bciwo\u015bci mog\u0105 zosta\u0107 utracone podczas gotowania, dlatego te\u017c produkty w ni\u0105 bogate powinny by\u0107 spo\u017cywane na surowo lub po kr\u00f3tkim czasie gotowania.<\/p>\n<h2 id=\"jakie-jest-dzienne-zapotrzebowanie-na-witamine-a\">Jakie jest dzienne zapotrzebowanie na witamin\u0119 A?<\/h2>\n<p>Dzienne zapotrzebowanie na witamin\u0119 A (lub retinol) wynosi oko\u0142o 0.6-0.7 mg (u kobiet w czasie laktacji mo\u017ce wzrosn\u0105\u0107 do 0.95 mg).<\/p>\n<h2 id=\"niedobor-witaminy-a\">Niedob\u00f3r witaminy A<\/h2>\n<p>Niedob\u00f3r witaminy A, czy te\u017c retinolu, mo\u017ce powodowa\u0107 zaburzenia widzenia, a z czasem mo\u017ce prowadzi\u0107 do \u015blepoty.<\/p>\n<p>Na og\u00f3\u0142 niedob\u00f3r witaminy A w organizmie mo\u017ce powodowa\u0107 spowolnienie wzrostu i rozwoju fizycznego. Mo\u017ce r\u00f3wnie\u017c by\u0107 przyczyn\u0105 podatno\u015bci na infekcje. U kobiet w ci\u0105\u017cy mo\u017ce natomiast prowadzi\u0107 do wad rozwojowych p\u0142odu.<\/p>\n<h2 id=\"nadmierne-spozycie-witaminy-a\">Nadmierne spo\u017cycie witaminy A<\/h2>\n<p>Wysoki poziom witaminy A mo\u017ce by\u0107 gromadzony w w\u0105trobie i powodowa\u0107 problemy z hiperwitaminoz\u0105, co mo\u017ce prowadzi\u0107 do uszkodzenia w\u0105troby i \u015bledziony.<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","Example":[],"class_list":["post-82589","enciclopedia","type-enciclopedia","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Witamina A - Humanitas.net<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Witamina A - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"Czym jest witamina A? Witamina A, czyli retinol, jest cz\u0119\u015bci\u0105 rozpuszczalnych w t\u0142uszczach zwi\u0105zk\u00f3w, kt\u00f3re znajduj\u0105 si\u0119 w w\u0105trobie i w razie potrzeby s\u0105 uwalniane w ma\u0142ych dawkach. Dlatego te\u017c nie jest konieczne regularne ich przyjmowanie, na przyk\u0142ad poprzez spo\u017cywanie \u017cywno\u015bci. 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