The Impact of Dietary Intake and Nutritional Status on Birth Outcomes Among Pregnant Adolescents: A Systematic Review

Abstract

Birth outcomes have been linked to the overall maternal general health including nutrition as well as maternal age during pregnancy. Compared to adults, delivery outcomes during adolescence are poor. Nutrient intake and nutrition status during adolescent pregnancy may be linked to birth outcomes. This review aims to identify the association between dietary intake and nutrition status of pregnant adolescents and their maternofetal outcomes. Literature search on nutrient intake and nutritional status of pregnant adolescents (aged 11-19 years) which identified 17 English papers from 1995 to 2019 was reviewed. Papers that did not include data on birth outcomes in relation to nutrient intake or nutritional status were excluded. The review showed that most micronutrients with the exception of Riboflavin, vitamins B12 and C were below the recommended levels whilst macronutrients levels were above the recommended levels. Energy intakes were also below the recommended levels. Most studies presented normal hemoglobin levels in the first trimester of pregnancy but these levels decreased as pregnancy progressed to the third trimester leading to a high prevalence of anemia. Well-regulated provision and intake of micronutrient supplementation and nutrition education to improve healthy eating habits will significantly reduce poor birth outcomes such as low birth weights (LBW), still births, preterm deliveries, small or large for gestational age (SGA and LGA) and intrauterine growth restrictions in pregnant adolescents. This review provides to a large extent evidence to support the importance of adolescent nutrition and birth outcomes. There is the need to implement policies to improve adolescent nutrition through a multisectoral approach.