{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:53:50Z","timestamp":1788915230532,"version":"build-2803163510"},"reference-count":356,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,30]],"date-time":"2021-01-30T00:00:00Z","timestamp":1611964800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100014013","name":"UK Research and Innovation","doi-asserted-by":"publisher","award":["MR\/P027938\/1"],"award-info":[{"award-number":["MR\/P027938\/1"]}],"id":[{"id":"10.13039\/100014013","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000024","name":"Canadian Institutes of Health Research","doi-asserted-by":"publisher","award":["FRN 10321"],"award-info":[{"award-number":["FRN 10321"]}],"id":[{"id":"10.13039\/501100000024","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>The placenta is a vital, multi-functional organ that acts as an interface between maternal and fetal circulation during pregnancy. Nutritional deficiencies during pregnancy alter placental development and function, leading to adverse pregnancy outcomes, such as pre-eclampsia, infants with small for gestational age and low birthweight, preterm birth, stillbirths and maternal mortality. Maternal nutritional supplementation may help to mitigate the risks, but the evidence base is difficult to navigate. The primary purpose of this umbrella review is to map the evidence on the effects of maternal nutritional supplements and dietary interventions on pregnancy outcomes related to placental disorders and maternal mortality. A systematic search was performed on seven electronic databases, the PROSPERO register and references lists of identified papers. The results were screened in a three-stage process based on title, abstract and full-text by two independent reviewers. Randomized controlled trial meta-analyses on the efficacy of maternal nutritional supplements or dietary interventions were included. There were 91 meta-analyses included, covering 23 types of supplements and three types of dietary interventions. We found evidence that supports supplementary vitamin D and\/or calcium, omega-3, multiple micronutrients, lipid-based nutrients, and balanced protein energy in reducing the risks of adverse maternal and fetal health outcomes. However, these findings are limited by poor quality of evidence. Nutrient combinations show promise and support a paradigm shift to maternal dietary balance, rather than single micronutrient deficiencies, to improve maternal and fetal health. The review is registered at PROSPERO (CRD42020160887).<\/jats:p>","DOI":"10.3390\/nu13020472","type":"journal-article","created":{"date-parts":[[2021,1,30]],"date-time":"2021-01-30T08:56:01Z","timestamp":1611996961000},"page":"472","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Effects of Maternal Nutritional Supplements and Dietary Interventions on Placental Complications: An Umbrella Review, Meta-Analysis and Evidence Map"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5846-3014","authenticated-orcid":false,"given":"Mai-Lei","family":"Kinshella","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shazmeen","family":"Omar","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kerri","family":"Scherbinsky","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"},{"name":"Department of Pediatrics, University of British Columbia, Vancouver, BC V6H 0B3, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marianne","family":"Vidler","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Magee","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"},{"name":"Department of Women &amp; Children\u2019s Health, King\u2019s College London, London WC2R 2LS, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"von Dadelszen","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology, BC Children\u2019s and Women\u2019s Hospital and University of British Columbia, Vancouver, BC V6Z 2K8, Canada"},{"name":"Department of Women &amp; Children\u2019s Health, King\u2019s College London, London WC2R 2LS, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Moore","sequence":"additional","affiliation":[{"name":"Department of Women &amp; Children\u2019s Health, King\u2019s College London, London WC2R 2LS, UK"},{"name":"Medical Research Council Unit, The Gambia at the London School of Hygiene and Tropical Medicine, Fajara, P.O. Box 273 Banjul, The Gambia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9380-1725","authenticated-orcid":false,"given":"Rajavel","family":"Elango","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, University of British Columbia, Vancouver, BC V6H 0B3, Canada"},{"name":"School of Population and Public Health, University of British Columbia, Vancouver, BC V6T 1Z3, Canada"},{"name":"Division of Neonatology, BC Women\u2019s Hospital and Health Centre, Vancouver, BC V6H 3N1, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"The PRECISE Conceptual Framework Working Group","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,30]]},"reference":[{"key":"ref_1","unstructured":"FAO, IFAD, UNICEF, WFP, and WHO (2020). 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