{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T19:52:58Z","timestamp":1776973978989,"version":"3.51.4"},"reference-count":54,"publisher":"Springer Science and Business Media LLC","issue":"2","license":[{"start":{"date-parts":[[2020,9,1]],"date-time":"2020-09-01T00:00:00Z","timestamp":1598918400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2020,9,1]],"date-time":"2020-09-01T00:00:00Z","timestamp":1598918400000},"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":[[2021,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Purpose<\/jats:title>\n                <jats:p>Bariatric surgery is associated with deficiencies of vitamins and minerals, and patients are routinely advised supplements postoperatively. We studied prevalence of vitamin B<jats:sub>12<\/jats:sub>, folate and iron deficiencies and anaemia before and after bariatric surgery over 4\u00a0years of follow-up.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Materials and Methods<\/jats:title>\n                <jats:p>We performed a retrospective cohort analysis of 353 people with obesity, including 257 (72.8%) women, who underwent gastric bypass (252, 71.4%) or sleeve gastrectomy (101, 28.6%) at our National Health Service bariatric centre in Northwest England.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>At baseline, mean (standard error) age was 46.0 (0.6)\u00a0years, body mass index 53.1 (0.4)\u00a0kg\/m<jats:sup>2<\/jats:sup>, serum vitamin B<jats:sub>12<\/jats:sub> 400.2 (16.4)\u00a0pg\/L, folate 7.7 (0.2)\u00a0\u03bcg\/L, iron 12.0 (0.3)\u00a0\u03bcmol\/L, ferritin 118.3 (8.4)\u00a0\u03bcg\/L and haemoglobin 137.9 (0.8)\u00a0g\/L. Frequency of low vitamin B<jats:sub>12<\/jats:sub> levels reduced from 7.5% preoperatively to 2.3% at 48\u00a0months (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.038). Mean folate levels increased from baseline to 48\u00a0months by 5.3\u00a0\u03bcg\/L (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001) but frequency of low folate levels increased from 4.7% preoperatively to 10.3% (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.048). Ferritin levels increased from baseline to 48\u00a0months by 51.3\u00a0\u03bcg\/L (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.009). Frequency of low ferritin levels was greater in women (39.1%) than in men (8.9%) at baseline (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001) and throughout the study period. Haemoglobin was low in 4.6% of all patients at baseline with no significant change over the study period.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>There were notable rates of haematinic insufficiencies in bariatric surgical candidates preoperatively. Our study lends further support to regular supplementation with vitamin B<jats:sub>12<\/jats:sub>, folic acid, and iron in people undergoing bariatric surgery.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s11695-020-04943-0","type":"journal-article","created":{"date-parts":[[2020,9,1]],"date-time":"2020-09-01T19:03:41Z","timestamp":1598987021000},"page":"682-693","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Haemoglobin and Hematinic Status Before and After Bariatric Surgery over 4 years of Follow-Up"],"prefix":"10.1007","volume":"31","author":[{"given":"Michael J.","family":"Shipton","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicholas J.","family":"Johal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Neel","family":"Dutta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher","family":"Slater","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zohaib","family":"Iqbal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Babur","family":"Ahmed","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Basil J.","family":"Ammori","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Siba","family":"Senapati","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Khurshid","family":"Akhtar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lucinda K. 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