Type 1 diabetes (T1D), formerly known as juvenile diabetes, is an autoimmune disease that originates when cells that make insulin (beta cells) are destroyed by the immune system.[2] Insulin is a hormone required for the cells to use blood sugar for energy and it helps regulate glucose levels in the bloodstream.[3] Before treatment this results in high blood sugar levels in the body.[4] The common symptoms of this elevated blood sugar are frequent urination, increased thirst, increased hunger, weight loss, and other serious complications.[2][5] Additional symptoms may include blurry vision, tiredness, and slow wound healing.[3] Symptoms typically develop over a short period of time, often a matter of weeks if not months.[4]
The cause of type 1 diabetes is unknown,[2] but it is believed to involve a combination of genetic and environmental factors.[4] The underlying mechanism involves an autoimmune destruction of the insulin-producing beta cells in the pancreas.[3] Diabetes is diagnosed by testing the level of sugar or glycated hemoglobin (HbA1C) in the blood.[6][7] Type 1 diabetes can typically be distinguished from type 2 by testing for the presence of autoantibodies[6] and/or declining levels/absence of C-peptide.
There is no known way to prevent type 1 diabetes.[2] Treatment with insulin is required for survival.[4] Insulin therapy is usually given by injection just under the skin but can also be delivered by an insulin pump.[8] A diabetic diet and exercise are important parts of management.[3] If left untreated, diabetes can cause many complications.[2] Complications of relatively rapid onset include diabetic ketoacidosis and nonketotic hyperosmolar coma.[6] Long-term complications include heart disease, stroke, kidney failure, foot ulcers and damage to the eyes.[2] Furthermore, since insulin lowers blood sugar levels, complications may arise from low blood sugar if more insulin is taken than necessary.[6]
Type 1 diabetes makes up an estimated 5–10% of all diabetes cases.[9] The number of people affected globally is unknown, although it is estimated that about 80,000 children develop the disease each year.[6] Within the United States the number of people affected is estimated at one to three million.[6][10] Rates of disease vary widely, with approximately one new case per 100,000 per year in East Asia and Latin America and around 30 new cases per 100,000 per year in Scandinavia and Kuwait.[11][12] It typically begins in children and young adults.[4]
^Cite error: The named reference WHO11 was invoked but never defined (see the help page).
^ abcdef"Diabetes Fact sheet N°312". WHO. November 2016. Archived from the original on 26 August 2013. Retrieved 29 May 2017.
^ abcd"Types of Diabetes". NIDDK. February 2014. Archived from the original on 16 August 2016. Retrieved 31 July 2016.
^ abcde"Causes of Diabetes". NIDDK. August 2014. Archived from the original on 10 August 2016. Retrieved 31 July 2016.
^ abcdefChiang JL, Kirkman MS, Laffel LM, Peters AL (July 2014). "Type 1 diabetes through the life span: a position statement of the American Diabetes Association". Diabetes Care. 37 (7): 2034–2054. doi:10.2337/dc14-1140. PMC 5865481. PMID 24935775.
^"Diagnosis of Diabetes and Prediabetes". NIDDK. May 2015. Archived from the original on 16 August 2016. Retrieved 31 July 2016.
^"Alternative Devices for Taking Insulin". NIDDK. July 2016. Archived from the original on 16 August 2016. Retrieved 31 July 2016.
^"Fast Facts Data and Statistics about Diabetes". American Diabetes Association. Archived from the original on 16 December 2015. Retrieved 25 July 2014.
^Global report on diabetes(PDF). World Health Organization. 2016. pp. 26–27. ISBN 978-92-4-156525-7. Archived (PDF) from the original on 7 October 2016. Retrieved 31 July 2016.
^Skyler J (2012). Atlas of diabetes (4th ed.). New York: Springer. pp. 67–68. ISBN 978-1-4614-1028-7. Archived from the original on 8 September 2017.
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