{"id":3311,"date":"2026-03-13T08:32:03","date_gmt":"2026-03-13T08:32:03","guid":{"rendered":"https:\/\/www.thyroidaware.com\/impact-of-iodine-deficiency\/"},"modified":"2026-06-18T08:48:29","modified_gmt":"2026-06-18T08:48:29","slug":"impact-of-iodine-deficiency","status":"publish","type":"page","link":"https:\/\/www.thyroidaware.com\/pt\/impact-of-iodine-deficiency\/","title":{"rendered":"Impacto da insufici\u00eancia de iodo"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n<div class=\"lazyblock-health-block-Z2iIe8 wp-block-lazyblock-health-block\"><div class=\"heading-detail\">\n      <p>A Tiroide.<\/p>\n<h1>Impacto da insufici\u00eancia de iodoo<\/h1>  <\/div>\n<div class=\"detail\">\n  <div class=\"detail-heading\">\n          <p class=\"has-electviolet-color has-text-color wp-block-heading\">Os dist\u00farbios da tiroide s\u00e3o algumas das doen\u00e7as mais frequentes no mundo, com cerca de 1,6 mil milh\u00f5es de pessoas em risco em todo o mundo.<sup>1<\/sup> O iodo \u00e9 um componente das hormonas da tiroide e, portanto, \u00e9 um fator importante no desenvolvimento do hipotiroidismo (tiroide inativa) e hipertiroidismo (tiroide hiperativa).<sup>1<\/sup>\u00a0Sem iodo suficiente, o hipotiroidismo, o cretinismo e outros transtornos de defici\u00eancia de iodo podem-se desenvolver. Por outro lado, o consumo excessivo de iodo pode levar ao hipertiroidismo.<sup>1<\/sup><\/p>      <\/div>\n  \n<div class=\"parent\">\n\t<div class=\"share-wrapper mb\">\n\n\t\t<div class=\"social-container\" id=\"socialBox\">\n\n\t\t\t<a id=\"facebookShare\" target=\"_blank\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/facebook-share.svg\" alt=\"Facebook\">\n\t\t\t<\/a>\n\n\t\t\t<a id=\"linkedinShare\" target=\"_blank\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/linkedin-share.svg\" alt=\"LinkedIn\">\n\t\t\t<\/a>\n\n\t\t\t<a id=\"whatsappShare\" target=\"_blank\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/whatsapp-share.svg\" alt=\"WhatsApp\">\n\t\t\t<\/a>\n\n\t\t\t<a id=\"emailShare\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/email-share.svg\" alt=\"Email\">\n\t\t\t<\/a>\n\n\t\t\t<a href=\"#\" id=\"copyLink\" data-copied=\"Link copied!\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/link-share.svg\" alt=\"Copy Link\">\n\t\t\t<\/a>\n\n\t\t<\/div>\n\t\t<div class=\"share-btn\" id=\"shareBtn\">\n\t\t\t<span>partilhe<\/span>\n\t\t\t<img decoding=\"async\" class=\"share-btn-detail-page\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/share-icon.png\" alt=\"\">\n\n\t\t<\/div>\n\t<\/div>\n<\/div>\n      <p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-286 size-full\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/uploads\/2026\/03\/iodine-deficiency.webp\" alt=\"\" width=\"610\" height=\"344\" srcset=\"https:\/\/www.thyroidaware.com\/wp-content\/uploads\/2026\/03\/iodine-deficiency.webp 610w, https:\/\/www.thyroidaware.com\/wp-content\/uploads\/2026\/03\/iodine-deficiency-300x169.webp 300w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/p>\n<h3><strong>Porque o iodo \u00e9 t\u00e3o importante?<\/strong><\/h3>\n<p>O iodo \u00e9 essencial para a produ\u00e7\u00e3o de hormonas da tiroide, para o desenvolvimento fetal e infantil, e \u00e9 um nutriente crucial para uma sa\u00fade adequada em todas as fases da vida.<sup>2<\/sup>\u00a0Como o nosso corpo n\u00e3o consegue produzir iodo, este tem de ser fornecido regularmente atrav\u00e9s de uma dieta saud\u00e1vel.<sup>2<\/sup>\u00a0A defici\u00eancia de iodo foi detetada em 54 pa\u00edses, de acordo com um relat\u00f3rio da Organiza\u00e7\u00e3o Mundial de Sa\u00fade (OMS).<sup>3<\/sup><\/p>\n<p>O iodo \u00e9 o componente-chave na produ\u00e7\u00e3o das hormonas tiroideias tiroxina (T4) e triiodotironina (T3).<sup>4<\/sup> As hormonas tiroideias ajudam o corpo a usar a energia de forma otimizada e a manter-se aquecido, bem como a manter o c\u00e9rebro, cora\u00e7\u00e3o, m\u00fasculos e outros \u00f3rg\u00e3os a funcionar corretamente.<sup>5<\/sup> As hormonas tiroideias e, por sua vez, o iodo s\u00e3o essenciais para o crescimento fetal, a matura\u00e7\u00e3o \u00f3ssea e para o desenvolvimento cerebral.<sup>2<\/sup>\u00a0<\/p>\n<p>Uma campanha a n\u00edvel global para suplementar o sal com iodo levou a que aproximadamente Apesar disto, cerca da 40% da popula\u00e7\u00e3o global continua em risco de car\u00eancia de iodo.<sup>7<\/sup><\/p>\n<h3><strong>Qual a quantidade de iodo que \u00e9 necess\u00e1ria?<\/strong><\/h3>\n<p>Uma colher de ch\u00e1 de iodo cont\u00e9m a quantidade necess\u00e1ria para toda a vida; no entanto, como o corpo n\u00e3o consegue armazenar iodo por longos per\u00edodos, existe a necessidade de pequenas quantidades regularmente.<sup>2<\/sup>\u00a0A maioria das pessoas pode tolerar grandes quantidades de iodo sem efeitos adversos. Uma ingest\u00e3o di\u00e1ria de iodo superior a 1.000 microgramas pode ser prejudicial.<sup>2<\/sup><\/p>\n<p>A necessidade di\u00e1ria de iodo muda ao longo da vida de uma pessoa:<sup>4<\/sup><\/p>\n<ul class=\"wp-block-list\">\n<li>Beb\u00e9s: 110\u2013130 microgramas<\/li>\n<li>Crian\u00e7as: (1\u20138 anos): 90 microgramas<\/li>\n<li>Crian\u00e7as: (9\u201313 anos): 120 microgramas<\/li>\n<li>Adolescentes e adultos: 150 microgramas<\/li>\n<li>Gr\u00e1vidas: 220 microgramas<\/li>\n<li>Lactantes: 290 microgramas<\/li>\n<\/ul>\n<p><strong>Nota:<\/strong> Os beb\u00e9s t\u00eam um alto risco de defici\u00eancia de iodo porque a sua necessidade de iodo e as hormonas tiroideias em rela\u00e7\u00e3o ao seu peso, \u00e9 muito maior do que em qualquer outro momento da sua vida.<sup>8\u00a0<\/sup>A American Thyroid Association (ATA) recomenda que todas as mulheres na fase de amamenta\u00e7\u00e3o tomem um suplemento di\u00e1rio de 150 microgramas de iodo<a>.<\/a><sup>9<\/sup><\/p>\n<h3><strong>Se planeia engravidar, o iodo vem primeiro<\/strong><\/h3>\n<p>Se planeia engravidar, se est\u00e1 gr\u00e1vida ou a amamentar, saiba que necessita de refor\u00e7ar a ingest\u00e3o de iodo na sua dieta alimentar.<sup>2,4<\/sup>\u00a0Mesmo uma ligeira defici\u00eancia de iodo durante a gravidez, pode ter efeitos sobre o desenvolvimento do beb\u00e9 e no parto pr\u00e9-termo.\u00a0Uma grave defici\u00eancia de iodo durante a gravidez pode levar ao aborto espont\u00e2neo ou \u00e0 morte fetal.<sup>3<\/sup>\u00a0Assim como levar a anormalidades cong\u00e9nitas, como o cretinismo, que \u00e9 uma forma s\u00e9ria e irrevers\u00edvel de atraso mental.<sup>3<\/sup>\u00a0O efeito mais profundo, mas menos grave, da defici\u00eancia de iodo \u00e9 a redu\u00e7\u00e3o da intelig\u00eancia que pode afetar a vida familiar, escolaridade e trabalho.<sup>3<\/sup><\/p>\n<p>Fale com o seu m\u00e9dico sobre os benef\u00edcios dos suplementos e quais os suplementos de iodo que poder\u00e1 necessitar.<\/p>\n<h3><strong>Como satisfazer a sua necessidade de iodo<\/strong><\/h3>\n<p>O marisco \u00e9 uma boa fonte isto porque os oceanos s\u00e3o ricos em iodo.<sup>2<\/sup>\u00a0Embora menos ricos em iodo do que a maioria dos frutos do mar, os ovos, a carne e os produtos l\u00e1cteos s\u00e3o mais ricos do que a maioria dos alimentos de origem vegetal.<sup>2<\/sup>\u00a0Qualquer sal usado em casa deve ser iodado.<sup>2<\/sup>\u00a0Para garantir uma ingest\u00e3o suficiente para beb\u00e9s no per\u00edodo de desmame, deve-se considerar o teor de iodo complementar em f\u00f3rmulas\/alimentos caseiros ou comerciais.<sup>8<\/sup><\/p>\n<p><strong>Fontes comuns de iodo na dieta alimentar:<sup>7<\/sup><\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li>Alguns tipos de p\u00e3o<\/li>\n<li>Sal de mesa iodado<\/li>\n<li>Queijo<\/li>\n<li>Peixe de \u00e1gua salgada<\/li>\n<li>Leite de vaca<\/li>\n<li>Algas marinhas<\/li>\n<li>Ovos<\/li>\n<li>Marisco<\/li>\n<li>Iogurte congelado<\/li>\n<li>Leite de soja<\/li>\n<li>Gelado<\/li>\n<li>Molho de soja<\/li>\n<li>Multivitaminas que cont\u00e9m iodo<\/li>\n<li>Iogurte<\/li>\n<\/ul>\n<p>O melhor m\u00e9todo para prevenir a defici\u00eancia de iodo \u00e9 a suplementa\u00e7\u00e3o diet\u00e9tica a longo prazo com sal iodado, a estrat\u00e9gia recomendada pela OMS. A OMS recomenda uma ingest\u00e3o de sal inferior a 5 gramas por dia (equivalente a cerca de 1 colher de ch\u00e1 de sal por dia) para prevenir doen\u00e7as cardiovasculares.<sup>10<\/sup>\u00a0Uma colher de ch\u00e1 de sal iodado cont\u00e9m cerca de 400 microgramas de iodo.<sup>7<\/sup>\u00a0Para suprir a necessidade total de iodo n\u00e3o deve consumir mais sal, mas sim consumir outros alimentos ricos em iodo.<sup>2<\/sup><\/p>\n<h3><strong>Consequ\u00eancias para a sa\u00fade da defici\u00eancia de iodo<\/strong><\/h3>\n<p>A defici\u00eancia cr\u00f3nica de iodo pode ser prejudicial \u00e0 sua sa\u00fade.<sup>7<\/sup> A falta de iodo leva \u00e0 diminui\u00e7\u00e3o das hormonas tiroideias e \u00e9 a causa mais comum de uma tiroide hipoativa (hipotiroidismo).<sup>1,7<\/sup> O efeito vis\u00edvel e inequ\u00edvoco da defici\u00eancia de iodo \u00e9 o aumento da tiroide, conhecido como b\u00f3cio.<sup>7<\/sup>\u00a0Para prevenir consequ\u00eancias graves para a sa\u00fade, \u00e9 importante reconhecer os primeiros sinais de defici\u00eancia de iodo.<\/p>\n<p>Aqui poder\u00e1 saber mais sobre o b\u00f3cio e os n\u00f3dulos \u2013 e tamb\u00e9m como os reconhecer e tratar.<\/p>\n<p>Os seguintes sintomas podem indicar uma falta de iodo:<sup>5,7<\/sup><\/p>\n<ul class=\"wp-block-list\">\n<li>Problemas de degluti\u00e7\u00e3o e de respira\u00e7\u00e3o<\/li>\n<li>Maior circunfer\u00eancia do pesco\u00e7o<\/li>\n<li>Fadiga<\/li>\n<li>Sensibilidade ao frio<\/li>\n<li>Pris\u00e3o de ventre<\/li>\n<li>Pele seca<\/li>\n<li>Depress\u00e3o<\/li>\n<\/ul>\n<p>Em crian\u00e7as:<\/p>\n<ul class=\"wp-block-list\">\n<li>Atrasos mental e f\u00edsico<sup>2<\/sup><\/li>\n<li>Decl\u00ednio na intelig\u00eancia (a defici\u00eancia de iodo reduz o QI em 15 pontos)<sup>11<\/sup><\/li>\n<li>Redu\u00e7\u00e3o do desempenho escolar<sup>12<\/sup><\/li>\n<\/ul>\n<p>As consequ\u00eancias mais graves da defici\u00eancia de iodo ocorrem em mulheres que est\u00e3o gr\u00e1vidas ou numa fase de amamenta\u00e7\u00e3o e em crian\u00e7as. Iodo suficiente e, por sua vez, hormonas suficientes da tiroide, s\u00e3o essenciais para o desenvolvimento normal do c\u00e9rebro e do sistema nervoso. O transtorno mais grave causado por uma grave defici\u00eancia de iodo durante a gravidez \u00e9 o <strong>cretinismo<\/strong>, uma condi\u00e7\u00e3o de atraso no crescimento f\u00edsico e mental.<sup>7<\/sup>\u00a0<\/p>\n<p>Um aporte suficiente de iodo \u00e9 a melhor maneira de prevenir essas complica\u00e7\u00f5es, assim como outras, tais como nados-mortos, abortos espont\u00e2neos ou crescimento deficiente.<sup>7<\/sup><\/p>\n<h3><strong>Websites \u00fateis<\/strong><\/h3>\n<p><a href=\"http:\/\/www.iccidd.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">http:\/\/www.iccidd.org<\/a><\/p>\n<p>The International Council for the Control of Iodine Deficiency Disorders (ICCIDD) \u00e9 uma organiza\u00e7\u00e3o sem fins lucrativos, n\u00e3o-governamental para a elimina\u00e7\u00e3o sustent\u00e1vel da defici\u00eancia de iodo e da promo\u00e7\u00e3o da nutri\u00e7\u00e3o ideal com iodo em todo o mundo.<\/p>\n<p><a href=\"http:\/\/www.unicef.org\/progressforchildren\/2007n6\/index_41509.htm\" target=\"_blank\" rel=\"noreferrer noopener\">http:\/\/www.unicef.org\/progressforchildren\/2007n6\/index_41509.htm<\/a><\/p>\n<p>United Nations Children\u2019s Fund (UNICEF) publica \u201cProgress for Children\u201d, uma revis\u00e3o estat\u00edstica que documenta o progresso em dire\u00e7\u00e3o aos \u201cObjetivos de Desenvolvimento do Mil\u00e9nio\u201d.<\/p>\n<p><a href=\"http:\/\/www.thyroid.org\/patients\/patient_brochures\/iodine_deficiency.html\" target=\"_blank\" rel=\"noreferrer noopener\">http:\/\/www.thyroid.org\/patients\/patient_brochures\/iodine_deficiency.html<\/a><\/p>\n<p>Informa\u00e7\u00e3o para o doente sobre a sa\u00fade da tiroide publicada pela ATA<\/p>  \n\n      <div class=\"reference-toggle\">\n      <div class=\"ref-header1\" id=\"refToggle\">\n        <span>Refer\u00eancias<\/span>\n        <img decoding=\"async\" class=\"refimg\" id=\"refIcon\" src=\"https:\/\/www.thyroidaware.com\/wp-content\/themes\/thyroidaware\/images\/ref-close.webp\" alt=\"\">\n      <\/div>\n\n      <div class=\"ref-content\" id=\"refContent\">\n        <ul>\n<li>Khan A, Khan MM, Akhtar S. Thyroid disorders, etiology and prevalence. J Med Sci 2002; 2: 89\u201394.\u00a0<a href=\"http:\/\/www.scialert.net\/fulltext\/?doi=jms.2002.89.94&amp;org=11\">http:\/\/www.scialert.net\/fulltext\/?doi=jms.2002.89.94&amp;org=11<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>Nutrition Australia. Nutrition fact sheet: iodine. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.nutritionaustralia.org\/sites\/default\/files\/Iodine_Printable%20Detailed%20Summary.pdf\">http:\/\/www.nutritionaustralia.org\/sites\/default\/files\/Iodine_Printable%20Detailed%20Summary.pdf<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>World Health Organization. Micronutrient deficiencies. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.who.int\/nutrition\/topics\/idd\/en\/\">http:\/\/www.who.int\/nutrition\/topics\/idd\/en\/<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>Institute of Medicine of the National Academies. Dietary reference intakes for vitamin A, vitamin K, arsenic, boron, chromium, copper, iodine, iron, manganese, molybdenum, nickel, silicon, vanadium, and zinc. Washington, DC: National Academy Press, 2001.<\/li>\n<li>American Thyroid Association. Hypothyroidism. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.thyroid.org\/wp-content\/uploads\/patients\/brochures\/ata-hypothyroidism-brochure.pdf\">http:\/\/www.thyroid.org\/wp-content\/uploads\/patients\/brochures\/ata-hypothyroidism-brochure.pdf<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>United Nations. Sixth report on the world nutrition situation. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.unscn.org\/files\/Publications\/RWNS6\/report\/SCN_report.pdf\">http:\/\/www.unscn.org\/files\/Publications\/RWNS6\/report\/SCN_report.pdf<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>American Thyroid Association. Iodine deficiency. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.thyroid.org\/wp-content\/uploads\/patients\/brochures\/IodineDeficiency_brochure.pdf\">http:\/\/www.thyroid.org\/wp-content\/uploads\/patients\/brochures\/IodineDeficiency_brochure.pdf<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>Zimmermann M. Low iodine intakes in weaning infants. IDD Newsletter 2010; 38: 1\u20133. Dispon\u00edvel em\u00a0<a href=\"http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.187.3644&amp;rep=rep1&amp;type=pdf\">http:\/\/citeseerx.ist.psu.edu\/viewdoc\/download?doi=10.1.1.187.3644&amp;rep=rep1&amp;type=pdf<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>American Thyroid Association. American Thyroid Association (ATA) issues statement on the potential risks of excess iodine ingestion and exposure. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.thyroid.org\/american-thyroid-association-ata-issues-statement-on-the-potential-risks-of-excess-iodine-ingestion-and-exposure\/\">http:\/\/www.thyroid.org\/american-thyroid-association-ata-issues-statement-on-the-potential-risks-of-excess-iodine-ingestion-and-exposure\/<\/a>. Acedido em Fevereiro 2017<\/li>\n<li>World Health Organization. Unhealthy diet. Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.who.int\/gho\/ncd\/risk_factors\/unhealthy_diet_text\/en\/index.html\">http:\/\/www.who.int\/gho\/ncd\/risk_factors\/unhealthy_diet_text\/en\/index.html<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>World Health Organization. Is it true that lack of iodine really causes brain damage? Dispon\u00edvel em\u00a0<a href=\"http:\/\/www.who.int\/features\/qa\/17\/en\/\">http:\/\/www.who.int\/features\/qa\/17\/en\/<\/a>.\u00a0Acedido em Fevereiro 2017<\/li>\n<li>Qian M, Wang D, Watkins WE et al. The effects of iodine on intelligence in children: a meta-analysis of studies conducted in China. Asia Pac J Clin Nutr 2005; 14: 32\u201342<\/li>\n<\/ul>      <\/div>\n    <\/div>\n  \n  \n<\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/page-health.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3311","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Impacto da insufici\u00eancia de iodo - Thyroid Aware<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.thyroidaware.com\/pt\/impact-of-iodine-deficiency\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Impacto da insufici\u00eancia de iodo - 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