China’s Yingyangbao Supplement Slashes Childhood Anemia in Poor Rural Areas

In the rolling hills and remote counties of Hunan Province, China, a small sachet of fortified powder has quietly transformed the health of thousands of infants and toddlers. A new multiwave cross-sectional study published in BMC Public Health documents eight consecutive years of nutritional surveillance among children aged 6 to 23 months living in some of the country’s poorest areas, and the findings are striking. Between 2016 and 2023, the prevalence of overall anemia among these young children fell by nearly 79 percent, dropping from 29.3 percent at the start of the observation period to just 6.2 percent by its end. The research team, led by Huixia Li of the Hunan Provincial Maternal and Child Health Care Hospital, attributes much of this remarkable decline to Yingyangbao, a complementary food supplement distributed through China’s Nutrition Improvement Program for Children in Poor Areas, known as NIPCPA.

Yingyangbao, whose name translates roughly as nutrition package, is a specially formulated micronutrient supplement designed to be mixed into a child’s regular complementary foods. It contains a dense blend of proteins, vitamins, and minerals, including iron, which is critical for preventing the anemia that so often shadows the weaning period in resource-limited settings. The supplement was developed as a practical response to a persistent problem: between roughly six months and two years of age, children’s rapid growth outstrips the iron and other nutrients available from breast milk alone and from the often monotonous plant-based gruels that dominate complementary feeding in many rural households. Without intervention, this gap frequently manifests as iron-deficiency anemia, which in early childhood is associated with impaired cognitive development, weakened immunity, and long-term developmental deficits.

The scale of the new analysis is one of its greatest strengths. Across eight annual survey rounds conducted from 2016 through 2023, the researchers enrolled a total of 16,895 children aged 6 to 23 months. Rather than relying on convenience samples, the team employed a rigorous multi-stage sampling design that combined probability proportionate to size sampling with random equidistant selection, drawing participants from seven counties in Hunan Province that participate in the national NIPCPA program. This methodology ensures that the children surveyed are statistically representative of the broader population of infants and toddlers in these impoverished areas, lending considerable weight to the temporal trends the study documents.

The anthropometric and hematological picture that emerged from the eight waves of data collection is broadly encouraging. On average across the study period, the children measured 76.8 centimeters in body length, weighed 9.95 kilograms, and carried a mean hemoglobin concentration of 118.8 grams per liter. The average prevalences of the three classic markers of undernutrition were low: stunting, a measure of chronic malnutrition reflected in height-for-age, affected 4.4 percent of children; underweight, which combines weight and height deficits, affected 3.2 percent; and wasting, the acute thinness that signals recent severe deprivation, affected 3.0 percent. By World Health Organization benchmarks, these figures place the studied population in a comparatively favorable position, a notable achievement for regions historically among the most nutritionally vulnerable in China.

The year-by-year trajectories tell an even more compelling story. Stunting prevalence declined by 30.9 percent over the study window, falling from 5.5 percent in 2016 to 3.8 percent in 2023. Underweight fell even more dramatically, dropping 58.0 percent from 5.0 percent to 2.1 percent. Wasting decreased from 3.8 percent in 2016 to 1.5 percent in 2023, though the researchers note it peaked at 3.8 percent in both 2016 and 2022, hinting at possible disruptions, perhaps related to the COVID-19 pandemic, that briefly reversed gains before the downward trend resumed. But the most dramatic transformation was in anemia. Overall anemia prevalence collapsed from 29.3 percent in 2016 to 6.2 percent in 2023, a 78.8 percent relative decline that moved the problem from a moderate public health concern to what the authors characterize as a mild one.

To determine whether Yingyangbao consumption itself was driving these improvements, the researchers fitted multivariate unconditional logistic regression models that adjusted for potential confounding factors. The analysis revealed a clear and dose-responsive relationship between the supplement and children’s anemia status, though interestingly, no significant association emerged between Yingyangbao consumption and stunting, underweight, or wasting. This pattern makes physiological sense: the supplement’s iron content directly targets the hematological pathway, while linear growth and body composition depend on a broader array of dietary, genetic, infectious, and socioeconomic influences that a single micronutrient sachet cannot fully address.

The quantitative findings on anemia are striking in their precision. Compared with children who did not consume Yingyangbao at all, those classified as effective consumers were substantially less likely to be anemic. The adjusted odds ratios were 0.43 for mild anemia, 0.20 for moderate anemia, and 0.38 for overall anemia, meaning effective consumption was associated with roughly an 80 percent reduction in the odds of moderate anemia. Even children classified as non-effective consumers, meaning those who received the supplement but did not consume it at the recommended frequency or consistency, fared better than non-consumers, with adjusted odds ratios of 0.61 for mild anemia, 0.41 for moderate anemia, and 0.57 for overall anemia. The distinction between effective and non-effective consumption underscores a practical lesson for program implementers: distribution alone is not enough, and caregiver education about proper daily use matters.

Duration of consumption added a further dimension to the dose-response relationship. Children who consumed Yingyangbao for fewer than six months had adjusted odds ratios of 0.52 for mild anemia, 0.29 for moderate anemia, and 0.54 for overall anemia compared with non-consumers. Those with six to eleven months of consumption showed slightly stronger protection, with corresponding odds ratios of 0.50, 0.24, and 0.42. The longest exposure category, twelve months or more, yielded the best outcomes for moderate anemia, with an odds ratio of 0.21, and an odds ratio of 0.35 for overall anemia. The gradient across duration categories suggests that sustained, habitual use of the supplement allows iron stores to accumulate and hematological status to stabilize, reinforcing the case for continuous rather than intermittent supplementation during the vulnerable 6-to-23-month window.

From a public health policy standpoint, the study offers a rare longitudinal validation of one of the world’s largest targeted nutrition interventions. The NIPCPA program, which distributes Yingyangbao free of charge to families in designated poor counties, has often been evaluated in short-term trials, but evidence spanning eight consecutive years of real-world implementation is comparatively scarce. The Hunan data suggest that the program has not only maintained consistent delivery across nearly a decade but has also contributed to a population-level shift in child hematological health. The authors conclude that while stunting, underweight, and wasting in these poor areas of Hunan are now at low levels, anemia remains a mild public health problem, and Yingyangbao intervention can effectively improve children’s anemia status, with better results from effective consumption and longer duration of use.

There are, of course, caveats inherent in the study design. As a series of cross-sectional surveys rather than a randomized controlled trial, the analysis can demonstrate strong associations but cannot definitively prove causation, and other concurrent improvements in rural living standards, healthcare access, and dietary diversity during this period may have contributed to the observed declines. Nevertheless, the consistency of the dose-response patterns, the large sample size, the representative sampling frame, and the adjustment for confounders all strengthen the plausibility that Yingyangbao played a meaningful role. For global health practitioners searching for scalable, low-cost models to combat early childhood anemia, the Hunan experience offers a compelling template: a simple fortified sachet, delivered reliably and consumed consistently, can help turn one of the most stubborn markers of early-life deprivation into a rapidly receding problem.

Subject of Research: Yingyangbao supplementation and child undernutrition and anemia trends in poor areas of Hunan, China

Article Title: Temporal trends (2016–2023) of undernutrition and anemia among children in poor areas, and relationship between Yingyangbao intervention and children’s nutrition status: a multiwave cross-sectional study in Hunan, China

Article References: Li, H., Liao, M., Xiao, J., Huang, Q., Feng, B., Tu, Y., Huang, G., & Zheng, J. (2026). Temporal trends (2016–2023) of undernutrition and anemia among children in poor areas, and relationship between Yingyangbao intervention and children’s nutrition status: a multiwave cross-sectional study in Hunan, China. BMC Public Health. https://doi.org/10.1186/s12889-026-29922-5

Image Credits: AI Generated

DOI: 10.1186/s12889-026-29922-5

Keywords: Yingyangbao, child nutrition, anemia, undernutrition, stunting, wasting, underweight, hemoglobin, micronutrient supplementation, public health, China, NIPCPA