{"id":80655,"date":"2018-04-13T13:59:40","date_gmt":"2018-04-13T13:59:40","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/vitamina-b12-cobalamina\/"},"modified":"2018-04-13T13:59:40","modified_gmt":"2018-04-13T13:59:40","slug":"vitamina-b12-cobalamina","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/ro\/wiki\/vitamina-b12-cobalamina\/","title":{"rendered":"Vitamina B12 (cobalamina)"},"content":{"rendered":"

Ce este vitamina B12?<\/h2>\n

Vitamina B12 sau cobalamina este parte din vitaminele solubile \u00een ap\u0103. Acestea nu sunt depozitate \u00een corp \u0219i trebuie luate regulat din alimente sau suplimente. Vitamina B12 nu este sensibil\u0103 la c\u0103ldur\u0103.<\/p>\n

Care este rolul vitaminei B12?<\/h2>\n

Vitamina B12, sau cobalamina, este implicat\u0103 \u00een conversia aminoacizilor, \u0219i \u00een formarea acizilor nucleic pentru sinteza ARN \u0219i ADN \u0219i \u00een acizii gra\u0219i. Joac\u0103 un rol important \u00een formarea globulelor ro\u0219ii \u0219i \u00een formarea m\u0103duvei spin\u0103rii.<\/p>\n

Ce alimente sunt bogate \u00een vitamina B12?<\/h2>\n

Vitamina B12 se g\u0103se\u0219te \u00een multe alimente de origine animal\u0103, de obicei \u00een cantit\u0103\u021bi mici. \u00cen special, \u00een carne, pe\u0219te, ficat, lapte \u0219i ou\u0103.<\/p>\n

Care este cerin\u021ba zilnic\u0103 de vitamina B12?<\/h2>\n

Cerin\u021ba zilnic\u0103 de vitamina B12 corespunde cu aproximativ 2 – 2.4 mcg, cantitatea recomandat\u0103 \u00eentr-o diet\u0103 normal\u0103. Femeile care sunt \u00eens\u0103rcinate trebuie s\u0103 re\u021bin\u0103 de dou\u0103 ori mai mult pentru a oferi fetusului cantitatea necesar\u0103 prin rezervele materne.<\/p>\n

Deficien\u021ba de vitamina B12<\/h2>\n

Este dificil de verificat situa\u021bia care implic\u0103 lipsa de vitamina B12, totu\u0219i, \u00een unele cazuri, o boal\u0103 de acest tip apare la persoanele care urmeaz\u0103 o diet\u0103 strict vegetarian\u0103 sau c\u00e2nd mecanismul de absorb\u021bie al intestinelor nu func\u021bioneaz\u0103 corect.<\/p>\n

Efectele secundare ale deficien\u021bei de vitamina B12 includ tulbur\u0103rile sistemului nervos \u0219i o form\u0103 de anemie numit\u0103 pernicioas\u0103, care este derivat\u0103 din produc\u021bia gre\u0219it\u0103 de globule. Femeile \u00eens\u0103rcinate trebuie s\u0103 evite deficien\u021ba de vitamina B12 pentru a evita efectele periculoase asupra fetusului.<\/p>\n

Ingerarea excesiv\u0103 de vitamina B12<\/h2>\n

\u00cen mod normal, ingerarea excesiv\u0103 de vitamina B12 poate fi eliminat\u0103 prin urin\u0103. Rar, exist\u0103 situa\u021bii \u00een care supradoza de vitamina B12 poate duce la simptome de la tremur la umflare, nervozitate, reac\u021bii alergice \u0219i b\u0103t\u0103i rapide ale inimii. De\u0219i rar, excesul de vitamina B12 din s\u00e2nge poate cauza probleme de rinichi.<\/p>\n

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