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Vitamin D status of pregnant women with obesity in the UK and its association with pregnancy outcomes: a secondary analysis of the UK Pregnancies Better Eating and Activity Trial (UPBEAT) study

Published online by Cambridge University Press:  18 April 2024

Karen M. O’Callaghan
Affiliation:
Department of Nutritional Sciences, School of Life Course and Population Sciences, King’s College London, London, UK
Katarzyna G. Nowak
Affiliation:
Department of Nutrition and Dietetics, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK Department of Women and Children’s Health, School of Life Course and Population Sciences, King’s College London, London, UK
Kathryn V. Dalrymple
Affiliation:
Department of Nutritional Sciences, School of Life Course and Population Sciences, King’s College London, London, UK
Lucilla Poston
Affiliation:
Department of Women and Children’s Health, School of Life Course and Population Sciences, King’s College London, London, UK
Jessica Rigutto-Farebrother
Affiliation:
Human Nutrition Laboratory, Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
Ola F. Quotah
Affiliation:
Department of Nutrition and Dietetics, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK Department of Clinical Nutrition, Faculty of Applied Medical Science, King Abdulaziz University, Jeddah, Saudi Arabia
Sara L. White
Affiliation:
Department of Women and Children’s Health, School of Life Course and Population Sciences, King’s College London, London, UK Department of Diabetes and Endocrinology, Guy’s and St Thomas’ Hospitals NHS Foundation Trust, London, UK
Angela C. Flynn*
Affiliation:
Department of Nutritional Sciences, School of Life Course and Population Sciences, King’s College London, London, UK School of Population Health, Royal College of Surgeons in Ireland, Dublin, Ireland
*
*Corresponding author: Angela C. Flynn, email angela.flynn@kcl.ac.uk

Abstract

Prenatal vitamin D deficiency is widely reported and may affect perinatal outcomes. In this secondary analysis of the UK Pregnancies Better Eating and Activity Trial, we examined vitamin D status and its relationship with selected pregnancy outcomes in women with obesity (BMI ≥ 30 kg/m2) from multi-ethnic inner-city settings in the UK. Determinants of vitamin D status at a mean of 17 ± 1 weeks’ gestation were assessed using multivariable linear regression and reported as percent differences in serum 25-hydroxyvitamin D (25(OH)D). Associations between 25(OH)D and clinical outcomes were examined using logistic regression. Among 1089 participants, 67 % had 25(OH)D < 50 nmol/l and 26 % had concentrations < 25 nmol/l. In fully adjusted models accounting for socio-demographic and anthropometric characteristics, 25(OH)D was lower among women of Black (% difference = −33; 95 % CI: −39, −27), Asian (% difference = −43; 95 % CI: −51, −35) and other non-White (% difference = −26; 95 % CI: −35, −14) ethnicity compared with women of White ethnicity (n 1086; P < 0·001 for all). In unadjusted analysis, risk of gestational diabetes was greater in women with 25(OH)D < 25 nmol/l compared with ≥ 50 nmol/l (OR = 1·58; 95 % CI: 1·09, 2·31), but the magnitude of effect estimates was attenuated in the multivariable model (OR = 1·33; 95 % CI: 0·88, 2·00). There were no associations between 25(OH)D and risk of preeclampsia, preterm birth or small for gestational age or large-for-gestational-age delivery. These findings demonstrate low 25(OH)D among pregnant women with obesity and highlight ethnic disparities in vitamin D status in the UK. However, evidence for a greater risk of adverse perinatal outcomes among women with vitamin D deficiency was limited.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Nutrition Society

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Footnotes

These authors contributed equally to this work.

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