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Four online databases were searched for relevant articles. Thirty\u2010one studies with 7639 patients were included in the meta\u2010analysis. The pooled anemia prevalence was 7%, 6%, 9%, 10%, 12%, 25%, 20%, and 18% at baseline, 3\u00a0months, 6\u00a0months, 12\u2009months, 24\u2009months, 36\u2009months, 48\u2009months, and 60\u2009months, respectively. Although the prevalence of vitamin B12 and folate deficiencies remained low postoperatively, the prevalence of ferritin deficiency steadily increased from 6% at baseline to 27% at 60\u2009months. The prevalence of serum iron deficiency decreased from 13% at baseline to 6% at 24\u2009months and increased to 20% at 60\u2009months. Anemia and ferritin deficiency were strongly correlated (Pearson correlation coefficient\u2009=\u20090.774, <jats:italic>p<\/jats:italic>\u2009=\u20090.041). Subgroup analysis suggested that age \u226440\u2009years, preoperative anemia, and insufficient iron supplementations were high\u2010risk factors for postoperative anemia. SG is associated with an increased risk of anemia and decreased iron storage over long\u2010term observation. Routine iron supplementations may reduce anemia after SG; however, the dosages recommended by current guidelines may be insufficient. More strict monitoring schedules and supplementation strategies should be established for the timely detection and management of postoperative anemia.<\/jats:p>","DOI":"10.1111\/obr.13516","type":"journal-article","created":{"date-parts":[[2022,11,3]],"date-time":"2022-11-03T02:58:30Z","timestamp":1667444310000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Prevalence of anemia and related nutrient deficiencies after sleeve gastrectomy: A systematic review and meta\u2010analysis"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5430-7057","authenticated-orcid":false,"given":"Yuntao","family":"Nie","sequence":"first","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5262-5246","authenticated-orcid":false,"given":"Ziru","family":"Tian","sequence":"additional","affiliation":[{"name":"School of Basic Medical Sciences Capital Medical University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengpeng","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baoyin","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nianrong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biao","family":"Zhou","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siqi","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaofan","family":"Hei","sequence":"additional","affiliation":[{"name":"Department of Emergency China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua","family":"Meng","sequence":"additional","affiliation":[{"name":"Department of General Surgery &amp; Obesity and Metabolic Disease Center China\u2010Japan Friendship Hospital  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,11,2]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pmed.1003206"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1210\/clinem\/dgaa006"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11695\u2010017\u20102719\u20101"},{"issue":"23","key":"e_1_2_8_5_1","first-page":"4930","article-title":"Sleeve gastrectomy: have we finally found the holy grail of bariatric surgery? 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