{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,2]],"date-time":"2026-08-02T10:56:19Z","timestamp":1785668179774,"version":"3.56.0"},"reference-count":46,"publisher":"Springer Science and Business Media LLC","issue":"4","license":[{"start":{"date-parts":[[2019,12,9]],"date-time":"2019-12-09T00:00:00Z","timestamp":1575849600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2019,12,9]],"date-time":"2019-12-09T00:00:00Z","timestamp":1575849600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100000770","name":"University of Manchester","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100000770","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["OBES SURG"],"published-print":{"date-parts":[[2020,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n<jats:title>Background<\/jats:title>\n<jats:p>Bariatric surgery for severe obesity can lead to micronutrient\/vitamin deficiencies.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Aims<\/jats:title>\n<jats:p>To study baseline and post-surgical prevalence of vitamin D deficiency in patients undergoing bariatric surgery.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Participants and Setting<\/jats:title>\n<jats:p>Patients undergoing bariatric surgery in a university teaching hospital in North West England.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>We performed an observational cohort analysis of longitudinal data on vitamin D and related parameters in patients who underwent bariatric surgery. Patients were routinely recommended daily combined calcium and vitamin D supplementation post-surgery.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>We studied 460 patients who had completed at least 12\u00a0months post-operatively; mean (standard deviation) age was 48.0 (10.5) years, weight 144.7 (27.3) kg and body mass index 50.0 (7.6) kg\/m<jats:sup>2<\/jats:sup>; 292 (63.5%) underwent gastric bypass and 168 (36.5%) sleeve gastrectomy. Vitamin D level was 33.1 (23.9) nmol\/L at baseline, rising to 57.1 (23.1) nmol\/L at 12\u00a0months post-surgery. Whereas 43.2% had vitamin D deficiency and 34.7% insufficiency preoperatively, 8.9% and 26.7% had deficiency and insufficiency, respectively, at 12\u00a0months with similar trends up to 4\u00a0years of follow-up. There were no significant differences between procedures or sexes in vitamin D levels or sufficiency rates.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>Vitamin D deficiency and insufficiency were prevalent pre-surgery and reduced significantly with routine supplementation post-surgery.<\/jats:p>\n<\/jats:sec>","DOI":"10.1007\/s11695-019-04318-0","type":"journal-article","created":{"date-parts":[[2019,12,9]],"date-time":"2019-12-09T18:02:47Z","timestamp":1575914567000},"page":"1473-1481","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Vitamin D Status After Gastric Bypass or Sleeve Gastrectomy over 4\u00a0Years of Follow-up"],"prefix":"10.1007","volume":"30","author":[{"given":"Alistair","family":"Fox","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris","family":"Slater","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Babur","family":"Ahmed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Basil J.","family":"Ammori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siba","family":"Senapati","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khurshid","family":"Akhtar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jodi","family":"Ellison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucinda K. 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