Dietary diversity is inversely correlated with pre-pregnancy body mass index among women in a Michigan pregnancy cohort.

Breanna M Kornatowski,Sarah S Comstock

doi:10.7717/peerj.5526

Abstract

BackgroundDuring pregnancy, healthy maternal body weight and a nutritionally complete diet provide a favorable environment for fetal development. Yet nearly two-thirds of women of reproductive age in the United States (US) are either overweight or obese. The objective of this research was to investigate the relationship between a measure of dietary diversity and body mass index (BMI) in a sample of women enrolled in a US pregnancy cohort.MethodsDietary data was obtained from one 24-hour dietary recall collected during the third trimester of pregnancy (n = 40). Pre-pregnancy BMI was calculated from pre-pregnancy weight and height self-reported by survey at the time of enrollment. Using the Minimum Dietary Diversity for Women (MDD-W) indicator developed by the Food and Agriculture Organization of the United Nations, dietary data was categorized and scored.ResultsOverall, 35% of participants did not achieve minimum dietary diversity (MDD-W ≥5). In addition, 45% of participants were obese, 35% were normal weight and 20% were overweight. Women with higher BMI had lower MDD-W scores than women with lower BMI (p < 0.05). The median MDD-W for both normal and overweight women was ≥5 indicating that normal and overweight pregnant women tended to consume a diet that was high in micronutrients. Conversely, the median MDD-W for obese women was below 5 meaning these women tended to consume a diet that was low in micronutrient density. The most commonly consumed food group was grain. In addition, 75% of all participants consumed sweetened drinks. Individuals with an MDD-W score ≥5, were more likely to have consumed dark green leafy vegetables, vitamin A-rich fruits or vegetables, other vegetables and other fruits than those with MDD-W scores <5.DiscussionIn this study, we show that a food group diversity indicator that has been shown to reflect adequacy of micronutrient intake in populations from less economically developed countries may also be informative in US populations. Furthermore, these results reflect the importance of encouraging all pregnant women with less varied diets to consume more fruits and vegetables.

Highlights

One in four American women are obese prior to becoming pregnant (Branum, Kirmeyer & Gregory, 2016)
Our research demonstrates that a lack of dietary diversity is an issue in the United States
Based on a single 24-hour dietary recall, women who were obese prior to becoming pregnant failed to consume a diverse diet during the third trimester of pregnancy

Summary

Introduction

One in four American women are obese prior to becoming pregnant (Branum, Kirmeyer & Gregory, 2016). Using the Minimum Dietary Diversity for Women (MDD-W) indicator developed by the Food and Agriculture Organization of the United Nations, dietary data was categorized and scored. The median MDD-W for both normal and overweight women was ≥ 5 indicating that normal and overweight pregnant women tended to consume a diet that was high in micronutrients. We show that a food group diversity indicator that has been shown to reflect adequacy of micronutrient intake in populations from less economically developed countries may be informative in US populations. These results reflect the importance of encouraging all pregnant women with less varied diets to consume more fruits and vegetables

Objectives

Methods

Results

Discussion

Conclusion