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| 1824 || {{w|Undernutrition}} || {{w|Micronutrient}} ({{w|vitamin deficiency}}) || Medical development || Combe of Edinburgh in {{w|Scotland}} first describes {{w|pernicious anemia}}.<ref name="Mineral Nutrition History">{{cite book |last1=McDowell |first1=Lee |title=Mineral Nutrition History: The Early Years |url=https://books.google.com.ar/books?id=Z4otDwAAQBAJ&pg=PA525&dq=%22vitamin+deficiency%22+%22in+1800..1850%22&hl=en&sa=X&ved=0ahUKEwi2oKORlu3mAhVHILkGHeAMBGAQ6AEIKTAA#v=onepage&q=%22vitamin%20deficiency%22%20%22in%201800..1850%22&f=false}}</ref> ||
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| 1847 || {{w|Undernutrition}} || || Organization (charity) || The {{w|British Relief Association}} is establishedby a group of prominent aristocrats, bankers and philanthropists.<ref>{{cite web |title=The British Relief Association and the Great Famine in Ireland |url=https://journals.openedition.org/rfcb/230 |website=journals.openedition.org |accessdate=15 December 2019}}</ref><ref>{{cite web |title=‘The Widow’s Mite’: private relief during the Great Famine |url=https://www.historyireland.com/18th-19th-century-history/the-widows-mite-private-relief-during-the-great-famine/ |website=historyireland.com |accessdate=15 December 2019}}</ref> The charity would be the largest private provider of relief during the {{w|Great Irish Famine}} and {{w|Highland Potato Famine}} of the 1840s.{{sfn|Kinealy|2001|p=71}}{{sfn|Kinealy|2013|p=167}} || {{w|United Kingdom}} ({{w|London}})
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| 1849 || {{w|Undernutrition}} || {{w|Micronutrient}} ({{w|vitamin deficiency}}) || Scientific development || The first clear description of [[w:vitamin B12 deficiency|vitamin B<sub>12</sub> deficiency]] is made by {{w|Thomas Addison}}.<ref>{{cite book|last1=Wailoo|first1=Keith|title=Drawing blood technology and disease identity in twentieth-century America|date=1999|publisher=Johns Hopkins University Press|location=Baltimore, Md.|isbn=9780801870293|page=Chapter 4|edition=Johns Hopkins Paperbacks|url=https://books.google.ca/books?id=1vYa5ipzJtoC&pg=PT50|chapter=The Corporate "Conquest" of Pernicious Anemia}}</ref><ref>{{cite book|title=Dictionary of Medicine|date=2014|publisher=Routledge|isbn=9781135928414|page=404|url=https://books.google.ca/books?id=xD3JAwAAQBAJ&pg=PA404}}</ref> ||
