Maternal dietary diversity during pregnancy and risk of low birth weight in newborns: A systematic review.

OBJECTIVE Maternal nutrition during pregnancy is a key factor influencing birth outcome. Dietary diversity is a proxy for multiple macro- and/or micronutrient sufficiency of an individual's diet. This systematic review aimed to summarize the findings on the association between maternal dietary diversity during pregnancy and the risk of low birth weight (LBW) in newborns. DESIGN This is a systematic review study. SETTING Google and the PubMed, Scopus and Google Scholar databases were searched to extract original studies on humans published until June 2020, without date restrictions. There was no limitation regarding geographic region or economic condition of countries. Duplicated and irrelevant studies were screened out and data were obtained through critical analysis. PARTICIPANTS Articles that examined the association between maternal dietary diversity during pregnancy and the risk of LBW in infants were included. RESULTS Of the 98 studies retrieved, 15 articles were included in the final review. All included articles represent low- and middle-income countries. 80% of the studies (n=12) indicated that low maternal dietary diversity during pregnancy is associated with an increased risk of LBW infants. Three studies that included a small number of LBW infants and did not take into account factors which may bias study results, failed to show this association. CONCLUSION The results suggest that low maternal dietary diversity during pregnancy may be associated with the risk of LBW, more specifically in developing countries. Dietary diversity might be a valuable predictor of maternal nutrition during pregnancy and the chance of giving birth to a LBW infant.