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There is a lack of published systematic review in the scientific literature on this topic. The aim of this study was to perform a systematic review and meta-analysis on hair loss after MBS in accordance with Preferred Reporting Items for Systematic reviews and Meta-Analysis (PRISMA) guidelines.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>PubMed, CINAHL, EMBASE, Web of Science, SCOPUS, and four Chinese databases were searched. Data were pooled using Review Manager 5.3 and Stata 12.0, and subgroups were performed if necessary and feasible.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>A total of 18 studies (<jats:italic>n<\/jats:italic> = 2538) were included. The pooled results showed that the incidence of hair loss after MBS was 57% (95% CI 42\u201371%). It decreased with longer follow-up times. Hair loss was significantly more common in younger (mean difference (MD), \u2212 2.45; 95% CI, \u2212 4.26 to \u2212 0.64; <jats:italic>p<\/jats:italic> = 0.008) women (OR, 3.87; 95% CI, 0.59 to 17.59; <jats:italic>p<\/jats:italic> = 0.08). Serum zinc (standardized mean difference (SMD), \u2212 1.13; 95% CI, \u2212 2.27 to 0.01, <jats:italic>p<\/jats:italic> = 0.05), folic acid (SMD = \u2212 0.88, 95% CI \u2212 1.29 to \u2212 0.46, <jats:italic>p<\/jats:italic> &lt; 0.0001), and ferritin levels (SMD, \u2212 0.22; 95% CI, \u2212 0.38 to \u2212 0.05; <jats:italic>p<\/jats:italic> = 0.01), but not serum iron and vitamin B<jats:sub>12<\/jats:sub>, were associated with hair loss following MBS.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Hair loss is common after MBS especially in younger women, and those with low serum levels of zinc, folic acid, and ferritin. Prospective studies on larger cohorts are needed.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s11695-021-05311-2","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T23:02:46Z","timestamp":1614985366000},"page":"2649-2659","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Hair Loss After Metabolic and Bariatric Surgery: a Systematic Review and Meta-analysis"],"prefix":"10.1007","volume":"31","author":[{"given":"Wen","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meiling","family":"Fan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cunchuan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kamal","family":"Mahawar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chetan","family":"Parmar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiju","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2341-3310","authenticated-orcid":false,"given":"Wah","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"on behalf of Global Bariatric Research Collaborative","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,5]]},"reference":[{"key":"5311_CR1","doi-asserted-by":"publisher","first-page":"6","DOI":"10.1016\/j.metabol.2018.09.005","volume":"92","author":"YC Chooi","year":"2019","unstructured":"Chooi YC, Ding C, Magkos F. 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