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The aim of this study was to assess vitamin D levels among male and female adolescents and young adults hospitalized for medical complications of eating disorders.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>We retrospectively reviewed electronic medical records of patients aged 9\u201325\u00a0years (N\u2009=\u2009565) admitted to the University of California, San Francisco Eating Disorders Program for medical instability, between May 2012 and August 2020. Serum vitamin D (25-hydroxy) level was assessed at admission as was history of prior calcium, vitamin D, or multivitamin supplementation. Linear regression was used to assess factors associated with vitamin D levels.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>A total of 93 males and 472 females met eligibility criteria (age 15.5\u2009\u00b1\u20092.8, 58.8% anorexia nervosa; admission body mass index 17.6\u2009\u00b1\u20092.91). Among male participants, 44.1% had 25-hydroxyvitamin D levels\u2009&lt;\u200930\u00a0ng\/mL, 18.3% had 25-hydroxyvitamin D levels\u2009&lt;\u200920\u00a0ng\/mL, and 8.6% had 25-hydroxyvitamin D levels\u2009&lt;\u200912\u00a0ng\/mL. There were no significant differences in 25-hydroxyvitamin D levels in males compared to females, except that a lower proportion (1.9%) of female participants had 25-hydroxyvitamin D levels\u2009&lt;\u200912\u00a0ng\/mL (<jats:italic>p<\/jats:italic>\u2009=\u20090.001). Only 3.2% of males reported calcium or vitamin D-specific supplementation prior to hospital admission, while 8.6% reported taking multivitamins. White race, prior calcium\/vitamin D supplementation, and higher calcium levels were associated with higher vitamin D levels on admission.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Nearly half of patients admitted to the hospital for malnutrition secondary to eating disorders presented with low 25-hydroxyvitamin D levels; males were more likely than females to have severe vitamin D deficiency. These findings support vitamin D assessment as part of the routine medical\/nutritional evaluation for hospitalized eating disorder patients, with particular attention on male populations.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40337-022-00627-5","type":"journal-article","created":{"date-parts":[[2022,7,18]],"date-time":"2022-07-18T14:02:59Z","timestamp":1658152979000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Assessment of vitamin D among male adolescents and young adults hospitalized with eating disorders"],"prefix":"10.1186","volume":"10","author":[{"given":"Jason M.","family":"Nagata","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Grandis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paola","family":"Bojorquez-Ramirez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anthony","family":"Nguyen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amanda E.","family":"Downey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyle T.","family":"Ganson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khushi P.","family":"Patel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanessa I.","family":"Machen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara M.","family":"Buckelew","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea K.","family":"Garber","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,7,18]]},"reference":[{"key":"627_CR1","first-page":"A4940","volume":"61","author":"SA Eriksen","year":"2014","unstructured":"Eriksen SA, Prietzel H, Ibsen JR, Lauritsen MB, Vestergaard P, Tell\u00e9us GK. 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The Institutional Review Board (IRB) of the University of California, San Francisco approved this study. This research study was conducted retrospectively from data obtained for clinical purposes. We consulted extensively with the IRB of the University of California, San Francisco who determined that our study did not need informed consent.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not Applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors have no conflict to declare.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"104"}}