Pregravid body mass index is negatively associated with diet quality during pregnancy.

摘要

This study investigated the association between pregravid wt. status and diet quality. Body mass index (BMI) cut-off points of <19.8 kg m-2 for underweight, 19.8-26.0 kg m-2 for normal wt., >26.0-29.0 kg m-2 for overweight and >29 kg m-2 for obese were used to categorise women's wt. status. Dietary information was obtained by self-report at 26-28 wk of gestation using a modified Block food-frequency questionnaire. The Diet Quality Index for Pregnancy (DQI-P) included: servings of grains, vegetables and fruits, folate, Fe and Ca intake, percentage calories from fat, and meal pattern scores. Multinomial logistic regression models were used to estimate the association between wt. status and tertiles of DQI-P controlling for potential individual confounders. Participants were a clinical-based population recruited through 4 prenatal clinics in central North Carolina, USA, comprising a total of 2394 women from the Pregnancy, Infection and Nutrition study. Evidence of a dose-response relationship was found between BMI and inadequate servings of grains and vegetables, as well as Fe and folate intake. Pregravid obesity was associated with 76% increased odds of falling into the lowest diet quality tertile compared with underweight women after controlling for potential confounders.