In parts of the world where daily nutrition is unstable, pregnancy and newborn health are more precarious. A new study led by epidemiologist Dongqing Wang of the George Mason University College of Public Health adds to the evidence that improving maternal nutrition during pregnancy may be a key intervention to improve birth outcomes.
Looking across eight clinical trials across Africa and South Asia, the study finds that balanced energy and protein (BEP) supplements—food-based products like beverages or nutrient-dense pastes designed to increase calorie and protein intake—are associated with healthier birth weights and fewer high-risk newborns in low- and middle-income countries. The findings were published in PLOS Medicine .
“In settings where pregnant women can’t access sufficient calories and protein, it is important to act early,” said Wang, an assistant professor of epidemiology in the Department of Global and Community Health . “Improving maternal nutrition can reduce the risk of vulnerable birth outcomes.”
Why this matters
Maternal malnutrition puts infants at higher risk of death, illness, and developmental delays.
Interventions have often focused on micronutrient supplements, but this study shows that food-based approaches to increase calorie and protein intake may better support fetal growth. BEP supplements can also be delivered through existing maternal health programs, making them a practical solution to scale. Wang is also currently conducting further research in Ethiopia that examines the cost-effectiveness of different approaches to BEP supplementation.
Study details
Wang and his colleagues combined individual-level data from randomized controlled trials conducted in Nepal, The Gambia, Pakistan, and several other low- and middle-income settings. The team compared outcomes for pregnant individuals who received BEP supplements with those who did not.
Key findings include:
Wang worked with a global network of researchers from institutions including Harvard T.H. Chan School of Public Health, the Food and Agriculture Organization of the United Nations, Aga Khan University and partners across Europe, South Asia and Africa.
PLOS Medicine
The effect of prenatal balanced energy and protein supplementation on small vulnerable newborn types in low- and middle-income countries: A systematic review and meta-analysis of individual participant data
18-Feb-2026