{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,1]],"date-time":"2026-03-01T15:54:57Z","timestamp":1772380497906,"version":"3.50.1"},"reference-count":49,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T00:00:00Z","timestamp":1761696000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background\/Objectives: Dietary intake during pregnancy influences hematological parameters, reflecting nutritional status and potentially affecting maternal and fetal outcomes. This cross-sectional pilot study aimed to compare dietary nutrient intake in pregnant women depending on their red cell distribution width-coefficient of variation (RDW-CV). Methods: A total of 31 pregnant women in their third trimester were divided into the following two groups: within reference range RDW-CV (n = 22) and elevated RDW-CV (n = 9). Dietary intake was assessed via a dietary recall (USDA Multiple-Pass Method). Intake of energy (kcal\/day), macronutrients (g\/day), vitamins (mg\/day; \u00b5g\/day) B1, B3, B6, B9, B12, C, A, D, E, and minerals (mg\/day) Zn, P, Mg, K, Ca, Fe were recorded. Complete blood count (CBC) parameters were measured (Total WBC, HGB, HCT, MCV, RDW-CV, PLT, NEU, LYM, MON, EOS, BAS, LMR). Results: The elevated RDW-CV group had a significantly lower level of daily energy adequacy. Both groups did not meet recommended intakes for energy, iron, vitamin D. A statistical significance in MCV differences was noted, with lower values in the elevated RDW-CV group, supported by a Cohen\u2019s d = 0.82, suggesting early changes in erythrocyte size distribution. The reference range RDW-CV group consumed significantly more zinc, phosphorus, calcium, and vitamin B12, whereas vitamin C intake was higher in the elevated RDW-CV group. Conclusions: Pregnant women with an elevated RDW-CV tended to exhibit greater nutritional insufficiencies than those with reference range RDW-CV. Our findings suggest potential associations between hematologic indices (RDW-CV, MCV) and dietary nutrient intake patterns during pregnancy. These preliminary observations are based on a pilot study and warrant confirmation in larger, prospective studies incorporating biochemical markers.<\/jats:p>","DOI":"10.3390\/nu17213396","type":"journal-article","created":{"date-parts":[[2025,10,30]],"date-time":"2025-10-30T00:50:19Z","timestamp":1761785419000},"page":"3396","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The Impact of Dietary Nutrient Intake on Red Blood Cell Distribution Width-Coefficient of Variation in Pregnant Women: A Cross-Sectional Observational Pilot Study"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4653-7164","authenticated-orcid":false,"given":"Katarzyna","family":"Antosiak-Cyrak","sequence":"first","affiliation":[{"name":"Department of Swimming and Water Lifesaving, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7720-0823","authenticated-orcid":false,"given":"Anna","family":"Demuth","sequence":"additional","affiliation":[{"name":"Department of Human Biological Development, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4121-0031","authenticated-orcid":false,"given":"Urszula","family":"Czerniak","sequence":"additional","affiliation":[{"name":"Department of Human Biological Development, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6755-5516","authenticated-orcid":false,"given":"Joanna","family":"Ratajczak","sequence":"additional","affiliation":[{"name":"Department of Human Biological Development, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4874-459X","authenticated-orcid":false,"given":"Ewa","family":"Bryl","sequence":"additional","affiliation":[{"name":"Department of Human Biological Development, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Piotr","family":"Kowalski","sequence":"additional","affiliation":[{"name":"Department of Physiology and Biochemistry, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9261-1332","authenticated-orcid":false,"given":"Krystian","family":"Wochna","sequence":"additional","affiliation":[{"name":"Department of Swimming and Water Lifesaving, Faculty of Sport Sciences, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2288-7549","authenticated-orcid":false,"given":"Magdalena","family":"Lewandowska","sequence":"additional","affiliation":[{"name":"Calculation Centre, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8117-1714","authenticated-orcid":false,"given":"Katarzyna","family":"Domaszewska","sequence":"additional","affiliation":[{"name":"Department of Physiology and Biochemistry, Poznan University of Physical Education, 61-871 Poznan, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,29]]},"reference":[{"key":"ref_1","first-page":"891","article-title":"Iron Deficiency Anemia in Pregnancy","volume":"11","author":"Spano","year":"2015","journal-title":"Women\u2019s Health"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Jouanne, M., Oddoux, S., No\u00ebl, A., and Voisin-Chiret, A.S. 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