{"id":16405,"date":"2020-05-26T00:00:00","date_gmt":"2020-05-25T22:00:00","guid":{"rendered":"https:\/\/www.ecoceutics.com\/vitamina-b1-la-tiamina\/"},"modified":"2023-07-27T09:34:01","modified_gmt":"2023-07-27T07:34:01","slug":"vitamina-b1-la-tiamina","status":"publish","type":"post","link":"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/","title":{"rendered":"Vitamina B1: la tiamina"},"content":{"rendered":"<p>La <strong>tiamina<\/strong>, antigament denominada <strong>vitamina\u00a0B1<\/strong>, \u00e9s una vitamina soluble en aigua que es va a\u00efllar i es va descriure en les d\u00e8cades de 1920-1930. La seva manca, denominada beri-beri, \u00e9s una malaltia que ja estava descrita en manuals de medicina xinesa redactats l\u2019any 2600 aC.<\/p>\n<p>En la segona meitat del segle XIX els primers experiments amb la dieta dels mariners van permetre identificar que el beri-beri estava lligat a una dieta limitada, i el treball amb dietes animals va permetre confirmar la import\u00e0ncia de la dieta en el beri-beri. Avui coneixem molt millor els aliments en els quals podem trobar la tiamina i el seu rol en la salut i en la malaltia, encara queda recerca per davant per a con\u00e8ixer-la completament.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contenido de la p\u00e1gina<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #333333;color:#333333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #333333;color:#333333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/#quina-es-la-funcio-de-la-vitamina-b1-en-el-nostre-organisme\" >Quina \u00e9s la funci\u00f3 de la vitamina\u00a0B1\u00a0en el nostre organisme?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/#en-quins-aliments-trobem-la-vitamina-b1\" >En quins aliments trobem la vitamina\u00a0B1?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/#per-que-puc-tenir-deficit-de-vitamina-b1\" >Per qu\u00e8 puc tenir d\u00e8ficit de vitamina\u00a0B1?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/#quins-efectes-te-el-deficit-de-vitamina-b1-en-el-cos\" >Quins efectes t\u00e9 el d\u00e8ficit de vitamina\u00a0B1\u00a0en el cos?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamina-b1-la-tiamina\/#suplementacio-amb-vitamina-b1\" >Suplementaci\u00f3 amb vitamina\u00a0B1<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quina-es-la-funcio-de-la-vitamina-b1-en-el-nostre-organisme\"><\/span>Quina \u00e9s la funci\u00f3 de la vitamina\u00a0B1\u00a0en el nostre organisme?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La <strong>vitamina\u00a0B1<\/strong> \u00e9s un cofactor essencial per a diversos enzims que participen en les reaccions metab\u00f2liques que permeten a les c\u00e8l\u00b7lules obtenir energia a partir de la glucosa. Si hi ha glucosa i hi ha enzims, per\u00f2 no hi ha tiamina no \u00e9s possible portar endavant les reaccions qu\u00edmiques correctament, d\u2019aqu\u00ed el nom de cofactor.<\/p>\n<p>Tamb\u00e9 t\u00e9 una funci\u00f3 important en el <strong>sistema nervi\u00f3s central<\/strong>, participant en la propagaci\u00f3 de l\u2019impuls nervi\u00f3s. El mecanisme exacte encara ha de ser dilucidat, per\u00f2 tres malalties neurol\u00f2giques que estan relacionades amb la manca de tiamina confirmen la seva relaci\u00f3 amb el sistema nervi\u00f3s central: la s\u00edndrome de\u00a0Wernicke-Korsakoff, la malaltia de Parkinson i la <a href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/alzheimer\/\"><strong>malaltia d\u2019Alzheimer<\/strong><\/a>. Encara que nom\u00e9s alguns casos de la primera s\u00edndrome es curen amb tiamina, alguns estudis en animals i en humans indiquen que tenir nivells adequats de vitamina\u00a0B1\u00a0en el sistema nervi\u00f3s resulta en una certa protecci\u00f3 contra el desenvolupament de les altres dues.<\/p>\n<p>La tiamina tamb\u00e9 compleix un rol en la <strong>salut vascular dels diab\u00e8tics<\/strong>. Els suplements amb tiamina han demostrat ser efectius en la prevenci\u00f3 de problemes card\u00edacs i neuropaties en models animals, i alguns experiments en humans han demostrat que la vitamina\u00a0B1\u00a0col\u00b7labora en la prevenci\u00f3 de problemes vasculars i l\u2019aparici\u00f3 de prote\u00efn\u00faria en diab\u00e8tics.<\/p>\n<p>Queda encara per determinar tractaments exactes i qui es beneficiarien realment de suplements amb tiamina, per\u00f2 les recerques fetes fins al moment s\u00f3n prometedores.<\/p>\n<p>Finalment, la vitamina\u00a0B1\u00a0ha demostrat una certa capacitat antioxidant, ja que es produeix mal oxidatiu en c\u00e8l\u00b7lules del sistema immune i del sistema nervi\u00f3s quan hi ha defici\u00e8ncia de tiamina.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"en-quins-aliments-trobem-la-vitamina-b1\"><\/span>En quins aliments trobem la vitamina\u00a0B1?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La vitamina\u00a0B1\u00a0es troba en moltes <strong>fruites i verdures<\/strong> en poca quantitat, i nom\u00e9s alguns aliments s\u00f3n not\u00f2riament m\u00e9s rics en tiamina. Les fonts m\u00e9s riques en la dieta humana s\u00f3n els cereals integrals com el <strong>blat i l\u2019arr\u00f2s, el llevat i el fetge<\/strong>, sobretot el fetge de porc.<\/p>\n<p>\u00c9s important que els <strong>cereals siguin integrals<\/strong> per a ser rics en vitamina\u00a0B1, ja que els cereals processats per a donar farines m\u00e9s blanques perden el teixit de reserva en el qual s\u2019emmagatzema la vitamina\u00a0B1, donant com a resultat un aliment molt m\u00e9s pobre en tiamina.<\/p>\n<p>Hi ha alguns processos que compliquen l\u2019obtenci\u00f3 de vitamina\u00a0B1\u00a0a partir dels aliments:<\/p>\n<ul>\n<li><strong>La tiamina es destrueix amb la calor<\/strong>, per la qual cosa una part del contingut de la vitamina\u00a0B1\u00a0es perd amb la cocci\u00f3. Per exemple, el pa pot perdre fins a un 35% de tiamina durant el proc\u00e9s d\u2019enfornat.<\/li>\n<li><strong>Els hidroxipolifenols<\/strong> presents en el te reaccionen amb la tiamina transformant-la en un compost no absorbible pel cos hum\u00e0.<\/li>\n<li><strong>Alguns enzims presents en el peix fresc,<\/strong> anomenades\u00a0tiaminases, poden destruir la tiamina present en altres aliments. Alguns exemples de peix amb\u00a0tiaminases s\u00f3n la tonyina clara o \u00abd\u2019aleta groga\u00bb i les clo\u00efsses.<\/li>\n<\/ul>\n<p>La vitamina\u00a0B1\u00a0s\u2019absorbeix i s\u2019excreta amb relativa rapidesa. Una persona que no rebi vitamina\u00a0B1\u00a0en la seva dieta perd les seves reserves en poques setmanes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"per-que-puc-tenir-deficit-de-vitamina-b1\"><\/span>Per qu\u00e8 puc tenir d\u00e8ficit de vitamina\u00a0B1?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Necessitem aproximadament <strong>1,0-1,5 mg de tiamina diaris<\/strong> per a cobrir les necessitats d\u2019un adult. La defici\u00e8ncia de vitamina\u00a0B1\u00a0pot provenir d\u2019una dieta pobra en tiamina (la majoria dels casos) o per alguns problemes que canvien les necessitats de tiamina de l\u2019organisme.<\/p>\n<p>L\u2019obesitat relacionada amb un alt consum de carbohidrats i glucosa augmenta la demanda de tiamina per a\u00a0metabolitzar\u00a0el sucre, amb el que les persones obeses tenen menys vitamina\u00a0B1\u00a0lliure circulant en sang que les persones no obeses.<\/p>\n<p>Els alcoh\u00f2lics tenen problemes amb la tiamina, ja que aquesta malaltia canvia la dieta de la persona portant a un menor consum de tiamina, l\u2019alcohol evita la correcta absorci\u00f3 de tiamina, i augmenten els requisits per a una correcta metabolitzaci\u00f3 de la beguda alcoh\u00f2lica. Existeixen altres condicions, per\u00f2 s\u00f3n m\u00e9s estranyes i solen respondre b\u00e9 a la suplementaci\u00f3 amb tiamina.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"quins-efectes-te-el-deficit-de-vitamina-b1-en-el-cos\"><\/span>Quins efectes t\u00e9 el d\u00e8ficit de vitamina\u00a0B1\u00a0en el cos?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Hi ha dos estadis diferenciats en la <strong>manca de vitamina\u00a0B1\u00a0<\/strong>per motius dietaris. Al principi hi ha s\u00edmptomes \u00abgenerals\u00bb com la falta de fam, falta de concentraci\u00f3, dolor muscular i feblesa, dolor d\u2019esquena, i fatiga general. Si la manca no es\u00a0corregeix en aquest estadi, s\u2019agreuja\u00a0el quadre i apareix el beri-beri, caracteritzat per anor\u00e8xia, engrandiment card\u00edac, feblesa muscular que arriba a la descoordinaci\u00f3 de moviments importants en\u00a0empassar\u00a0o moure les extremitats, i altres s\u00edmptomes que poden variar segons el tipus cl\u00ednic de beri-beri.<\/p>\n<p>El beri-beri dietari va ser molt com\u00fa fins a comen\u00e7aments del segle XX, sobretot en societats que basaven la seva dieta en l\u2019arr\u00f2s blanc en comptes d\u2019utilitzar arr\u00f2s integral. Avui dia \u00e9s molt poc freq\u00fcent gr\u00e0cies a les millores en la nostra dieta i a l\u2019\u00fas d\u2019aliments fortificats en vitamina\u00a0B1.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"suplementacio-amb-vitamina-b1\"><\/span>Suplementaci\u00f3 amb vitamina\u00a0B1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Una bona dieta aporta la quantitat de tiamina necess\u00e0ria per al correcte desenvolupament del cos hum\u00e0, per\u00f2 en els casos en els quals \u00e9s necessari complementar la dieta la tiamina sol ser ben tolerada. Dosi de 300 mg\/dia per via oral s\u2019han utilitzat sense problemes per a tractar el beri-beri o la s\u00edndrome de\u00a0Wernicke-Korsakoff. \u00c9s dif\u00edcil fer una sobredosi de tiamina, per\u00f2 igualment et recomanem que parlis amb el teu farmac\u00e8utic de confian\u00e7a abans de comen\u00e7ar una suplementaci\u00f3 en dosis altes pel teu compte.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La tiamina, antigament denominada vitamina\u00a0B1, \u00e9s una vitamina soluble en aigua que es va a\u00efllar i es va descriure en les d\u00e8cades de 1920-1930. La seva manca, denominada beri-beri, \u00e9s una malaltia que ja estava descrita en manuals de medicina xinesa redactats l\u2019any 2600 aC. En la segona meitat del segle XIX els primers experiments [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":19516,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[4,59],"tags":[],"class_list":["post-16405","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-respostes-de-salut","category-vitamines"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La tiamina, tamb\u00e9 coneguda com a Vitamina B1 | ecoceutics<\/title>\n<meta name=\"description\" content=\"La tiamina, o vitamina B1 \u00e9s essencial pel nostre sistema nervi\u00f3s central, per la nostra salut vascular, aix\u00ed com un potent antioxidant.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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