{"id":373,"date":"2019-12-12T12:59:37","date_gmt":"2019-12-12T17:59:37","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/chapter\/iodine\/"},"modified":"2025-01-17T17:53:04","modified_gmt":"2025-01-17T22:53:04","slug":"iodine","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/chapter\/iodine\/","title":{"raw":"Iodine","rendered":"Iodine"},"content":{"raw":"

Role of Iodine<\/h1>\r\nRecall the discovery of iodine and its use as a means of preventing goiter, a gross enlargement of the thyroid gland in the neck. Iodine is essential for the synthesis of thyroid hormone, which regulates body temperature, reproduction, basal metabolism, growth, and development.\r\n

Dietary Reference Intakes for Iodine<\/h2>\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Table 9.13: Dietary reference intakes for iodine<\/caption>\r\n
Age Group<\/td>\r\nRDA Males and Females mcg\/day<\/td>\r\nUL<\/td>\r\n<\/tr>\r\n
Infants (0\u20136 months)<\/td>\r\n110*<\/td>\r\n<\/td>\r\n<\/tr>\r\n
Infants (7\u201312 months)<\/td>\r\n130*<\/td>\r\n<\/td>\r\n<\/tr>\r\n
Children (1\u20133 years)<\/td>\r\n90<\/td>\r\n200<\/td>\r\n<\/tr>\r\n
Children (4\u20138 years)<\/td>\r\n120<\/td>\r\n300<\/td>\r\n<\/tr>\r\n
Children (9\u201313 years)<\/td>\r\n150<\/td>\r\n600<\/td>\r\n<\/tr>\r\n
Adolescents (14\u201318 years)<\/td>\r\n150<\/td>\r\n900<\/td>\r\n<\/tr>\r\n
Adults (> 19 years)<\/td>\r\n150<\/td>\r\n1,100<\/td>\r\n<\/tr>\r\n
*denotes Adequate Intake<\/td>\r\n<\/td>\r\n<\/td>\r\n<\/tr>\r\n
Data Source: (\"Iodine,\" 2011)<\/span>[footnote]Health Professional Fact Sheet: Iodine. National Institute of Health, Office of Dietary Supplements. https:\/\/ods.od.nih.gov\/factsheets\/Iodine-HealthProfessional\/. Updated June 24, 2011. Accessed November 10, 2017.[\/footnote]<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n

Dietary Sources of Iodine<\/h2>\r\nThe mineral content of foods is greatly affected by the soil from which it grew, and thus geographic location is the primary determinant of the mineral content of foods. For instance, iodine comes mostly from seawater, so the greater the distance from the sea, the lesser the iodine content in the soil.\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Table 9.14: Iodine content of various foods<\/caption>\r\n
Food<\/td>\r\nServing<\/td>\r\nIodine (mcg)<\/td>\r\n<\/tr>\r\n
Seaweed<\/td>\r\n1 g.<\/td>\r\n16 to 2,984<\/td>\r\n<\/tr>\r\n
Cod fish<\/td>\r\n3 oz.<\/td>\r\n99<\/td>\r\n<\/tr>\r\n
Yogurt, low fat<\/td>\r\n8 oz.<\/td>\r\n75<\/td>\r\n<\/tr>\r\n
Iodized salt<\/td>\r\n1.5 g.<\/td>\r\n71<\/td>\r\n<\/tr>\r\n
Milk, reduced fat<\/td>\r\n8 oz.<\/td>\r\n56<\/td>\r\n<\/tr>\r\n
Ice cream, chocolate<\/td>\r\n\u00bd c.<\/td>\r\n30<\/td>\r\n<\/tr>\r\n
Egg<\/td>\r\n1 large<\/td>\r\n24<\/td>\r\n<\/tr>\r\n
Tuna, canned<\/td>\r\n3 oz.<\/td>\r\n17<\/td>\r\n<\/tr>\r\n
Prunes, dried<\/td>\r\n5 prunes<\/td>\r\n13<\/td>\r\n<\/tr>\r\n
Banana<\/td>\r\n1 medium<\/td>\r\n3<\/td>\r\n<\/tr>\r\n
Data Source: (\"Iodine,\" 2011)<\/span>[footnote]Health Professional Fact Sheet: Iodine. National Institute of Health, Office of Dietary Supplements. https:\/\/ods.od.nih.gov\/factsheets\/Iodine-HealthProfessional\/. Updated June 24, 2011. Accessed November 10, 2017.[\/footnote]<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n

Consuming Too Little Iodine<\/h2>\r\nLow iodine levels, which consequently result in hypothyroidism, have many signs and symptoms including fatigue, sensitivity to cold, constipation, weight gain, depression, and dry, itchy skin and paleness. The development of goiter may often be the most visible sign of chronic iodine deficiency, but the consequences of low levels of thyroid hormone can be severe during infancy, childhood, and adolescence as it affects all stages of growth and development. The thyroid hormone plays a major role in brain development and growth, and fetuses and infants with severe iodine deficiency develop a condition known as cretinism, in which physical and neurological impairment can be severe. The World Health Organization (WHO) estimates iodine deficiency affects over two billion people worldwide and it is the number one cause of preventable brain damage worldwide.[footnote]World Health Organization. \u201cIodine Status Worldwide.\u201d Accessed October 2, 2011. http:\/\/whqlibdoc.who.int\/publications\/2004\/9241592001.pdf.[\/footnote]\r\n\r\n \r\n\r\n[caption id=\"attachment_372\" align=\"aligncenter\" width=\"259\"]\"A Figure 9.9 Iodine deficiency: goiter.[\/caption]\r\n

Consuming Too Much Iodine<\/h2>\r\nExcess iodine consumption, which is generally related to supplementation, also causes the thyroid gland to swell, resulting in goiter. Excess iodine consumption can also result in hyperthyroidism, which may play a role in weight loss, increased heat production, muscular tremors, nervousness, racing heartbeat, and protrusion of the eyes.","rendered":"

Role of Iodine<\/h1>\n

Recall the discovery of iodine and its use as a means of preventing goiter, a gross enlargement of the thyroid gland in the neck. Iodine is essential for the synthesis of thyroid hormone, which regulates body temperature, reproduction, basal metabolism, growth, and development.<\/p>\n

Dietary Reference Intakes for Iodine<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Table 9.13: Dietary reference intakes for iodine<\/caption>\n
Age Group<\/td>\nRDA Males and Females mcg\/day<\/td>\nUL<\/td>\n<\/tr>\n
Infants (0\u20136 months)<\/td>\n110*<\/td>\n<\/td>\n<\/tr>\n
Infants (7\u201312 months)<\/td>\n130*<\/td>\n<\/td>\n<\/tr>\n
Children (1\u20133 years)<\/td>\n90<\/td>\n200<\/td>\n<\/tr>\n
Children (4\u20138 years)<\/td>\n120<\/td>\n300<\/td>\n<\/tr>\n
Children (9\u201313 years)<\/td>\n150<\/td>\n600<\/td>\n<\/tr>\n
Adolescents (14\u201318 years)<\/td>\n150<\/td>\n900<\/td>\n<\/tr>\n
Adults (> 19 years)<\/td>\n150<\/td>\n1,100<\/td>\n<\/tr>\n
*denotes Adequate Intake<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Data Source: (“Iodine,” 2011)<\/span>[1]<\/sup><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dietary Sources of Iodine<\/h2>\n

The mineral content of foods is greatly affected by the soil from which it grew, and thus geographic location is the primary determinant of the mineral content of foods. For instance, iodine comes mostly from seawater, so the greater the distance from the sea, the lesser the iodine content in the soil.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Table 9.14: Iodine content of various foods<\/caption>\n
Food<\/td>\nServing<\/td>\nIodine (mcg)<\/td>\n<\/tr>\n
Seaweed<\/td>\n1 g.<\/td>\n16 to 2,984<\/td>\n<\/tr>\n
Cod fish<\/td>\n3 oz.<\/td>\n99<\/td>\n<\/tr>\n
Yogurt, low fat<\/td>\n8 oz.<\/td>\n75<\/td>\n<\/tr>\n
Iodized salt<\/td>\n1.5 g.<\/td>\n71<\/td>\n<\/tr>\n
Milk, reduced fat<\/td>\n8 oz.<\/td>\n56<\/td>\n<\/tr>\n
Ice cream, chocolate<\/td>\n\u00bd c.<\/td>\n30<\/td>\n<\/tr>\n
Egg<\/td>\n1 large<\/td>\n24<\/td>\n<\/tr>\n
Tuna, canned<\/td>\n3 oz.<\/td>\n17<\/td>\n<\/tr>\n
Prunes, dried<\/td>\n5 prunes<\/td>\n13<\/td>\n<\/tr>\n
Banana<\/td>\n1 medium<\/td>\n3<\/td>\n<\/tr>\n
Data Source: (“Iodine,” 2011)<\/span>[2]<\/sup><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Consuming Too Little Iodine<\/h2>\n

Low iodine levels, which consequently result in hypothyroidism, have many signs and symptoms including fatigue, sensitivity to cold, constipation, weight gain, depression, and dry, itchy skin and paleness. The development of goiter may often be the most visible sign of chronic iodine deficiency, but the consequences of low levels of thyroid hormone can be severe during infancy, childhood, and adolescence as it affects all stages of growth and development. The thyroid hormone plays a major role in brain development and growth, and fetuses and infants with severe iodine deficiency develop a condition known as cretinism, in which physical and neurological impairment can be severe. The World Health Organization (WHO) estimates iodine deficiency affects over two billion people worldwide and it is the number one cause of preventable brain damage worldwide.[3]<\/sup><\/a><\/p>\n

 <\/p>\n

\"A
Figure 9.9 Iodine deficiency: goiter.<\/figcaption><\/figure>\n

Consuming Too Much Iodine<\/h2>\n

Excess iodine consumption, which is generally related to supplementation, also causes the thyroid gland to swell, resulting in goiter. Excess iodine consumption can also result in hyperthyroidism, which may play a role in weight loss, increased heat production, muscular tremors, nervousness, racing heartbeat, and protrusion of the eyes.<\/p>\n

  1. Health Professional Fact Sheet: Iodine. National Institute of Health, Office of Dietary Supplements. https:\/\/ods.od.nih.gov\/factsheets\/Iodine-HealthProfessional\/. Updated June 24, 2011. Accessed November 10, 2017. ↵<\/a><\/li>
  2. Health Professional Fact Sheet: Iodine. National Institute of Health, Office of Dietary Supplements. https:\/\/ods.od.nih.gov\/factsheets\/Iodine-HealthProfessional\/. Updated June 24, 2011. Accessed November 10, 2017. ↵<\/a><\/li>
  3. World Health Organization. \u201cIodine Status Worldwide.\u201d Accessed October 2, 2011. http:\/\/whqlibdoc.who.int\/publications\/2004\/9241592001.pdf. ↵<\/a><\/li><\/ol><\/div>","protected":false},"author":1806,"menu_order":8,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":"cc-by-nc-sa"},"chapter-type":[48],"contributor":[],"license":[57],"class_list":["post-373","chapter","type-chapter","status-publish","hentry","chapter-type-standard","license-cc-by-nc-sa"],"part":1029,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapters\/373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/wp\/v2\/users\/1806"}],"version-history":[{"count":11,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapters\/373\/revisions"}],"predecessor-version":[{"id":2735,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapters\/373\/revisions\/2735"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/parts\/1029"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapters\/373\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/wp\/v2\/media?parent=373"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/pressbooks\/v2\/chapter-type?post=373"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/wp\/v2\/contributor?post=373"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/humannutrition\/wp-json\/wp\/v2\/license?post=373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}