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The present work used data from the recent representative <jats:italic>National Teens\u2019 Food Survey II<\/jats:italic> (2019\u20132020) to assess calcium and vitamin D intakes of teenagers in Ireland, including adequacy of such intakes, as well as, for the first time, to characterise serum 25-hydroxyvitamin D (25(OH)D) concentrations and their determinants.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Usual calcium and vitamin D intake estimates were generated using food intake data (via 4-day weighed food records) from a nationally representative sample of teenagers aged 13\u201318\u00a0years in Ireland (<jats:italic>n<\/jats:italic> 428). Serum 25(OH)D was measured (via LC\u2013MS\/MS) in the 57.5% (<jats:italic>n<\/jats:italic> 246) who provided a blood sample.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Sixty-seven and 94% of Irish teenagers had intakes of calcium and vitamin D below the respective Estimated Average Requirements values, reflecting a high degree of inadequacy of intake for both micronutrients (and higher in girls than boys; <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001). In addition, 21.7% and 33.1% of teenagers had serum 25(OH)D\u2009&lt;\u200930\u00a0nmol\/L (risk of vitamin D deficiency) and 30\u201349.9\u00a0nmol\/L (inadequacy), respectively. Extended winter sampling, being aged 16\u201318\u00a0years, low total vitamin D intake, being overweight\/obese or being of non-white skin type were significant (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) predictors of serum 25(OH)D\u2009&lt;\u200930\u00a0nmol\/L.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>There was a high prevalence of inadequacy of intake of calcium and vitamin D in Irish teenagers, and a fifth were at increased risk of vitamin D deficiency.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00394-022-02939-3","type":"journal-article","created":{"date-parts":[[2022,7,3]],"date-time":"2022-07-03T12:02:10Z","timestamp":1656849730000},"page":"4001-4014","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Adequacy of calcium and vitamin D nutritional status in a nationally representative sample of Irish teenagers aged 13\u201318\u00a0years"],"prefix":"10.1007","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8185-1039","authenticated-orcid":false,"given":"Kevin D.","family":"Cashman","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Kehoe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Kearney","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Breige","family":"McNulty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janette","family":"Walton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert","family":"Flynn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,7,3]]},"reference":[{"key":"2939_CR1","doi-asserted-by":"publisher","first-page":"1726","DOI":"10.1007\/s00198-006-0172-4","volume":"17","author":"O Johnell","year":"2006","unstructured":"Johnell O, Kanis JA (2006) An estimate of the worldwide prevalence and disability associated with osteoporotic fractures. 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The study was conducted according to the guidelines laid down in the Declaration of Helsinki. Written informed consent was obtained from all teenage participants and their parent(s)\/guardian(s).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical standards"}}]}}