RESUMEN
BACKGROUND: Adherence to unhealthy dietary patterns may alter the risk of mental disorders during pregnancy and the postpartum period. OBJECTIVE: To analyze the association between prepregnancy dietary patterns and prospective variations on anxiety symptoms from midpregnancy to early postpartum. METHODS: A prospective cohort of 207 healthy pregnant women was followed at 5 to 13, 20 to 26, and 30 to 36 gestational weeks, and once at 30 to 45 days postpartum. The State-Trait Anxiety Inventory was used to evaluate anxiety symptoms at the second and third gestational trimesters and during the postpartum period. Dietary intake was assessed using a food frequency questionnaire administered during the first trimester of pregnancy that referred to the 6 months before pregnancy. Principal components analysis was used to identify dietary patterns and three prepregnancy dietary patterns were identified: common-Brazilian, healthy, and processed. Three longitudinal mixed-effect models were estimated to verify the association between dietary patterns and anxiety symptoms, adjusted for confounding variables. RESULTS: The mean anxiety symptom scores were 40.4, 40.5, and 37.2 for the second trimester, third trimester, and postpartum, respectively. The rate of variation of the State-Trait Anxiety Inventory score was 0.535 (95% CI -0.035 to 1.107; P=0.066) and -0.010 (95% CI -0.018 to -0.002; P=0.019) when accounting for gestational age and quadratic gestational age, respectively. The common-Brazilian pattern, comprised mainly of rice and beans (ß=-1.200, 95% CI -2.220 to -0.181; P=0.021), and the healthy pattern comprised mostly of vegetables, fruits, fish, and tea (ß=-1.290, 95% CI -2.438 to -0.134; P=0.029), were negatively associated with prospective changes in anxiety symptoms. CONCLUSIONS: High adherence to the common-Brazilian or healthy patterns was negatively associated with higher anxiety symptom scores from mid-pregnancy to early postpartum in this group of Brazilian women.