Epigenetic legacy of early-life undernutrition: methodological lessons from Dutch and Chinese famine studies

The recent rise in global food insecurity has renewed scientific interest in understanding the long-term health consequences of early-life nutritional deprivation. This study critically evaluates the experimental designs and methodological approaches of key publications examining the epigenetic and phenotypic effects of the Dutch and Chinese famines. Specifically, these studies were assessed for sample size, control group selection, relevance of tissue sampling, timing of famine exposure, and the quality of statistical reporting. Research on both famines has centered on prenatal exposure and subsequent health outcomes, providing important insights into how in utero nutritional deprivation may lead to long-lasting epigenetic modifications. These changes have been linked to elevated risks for metabolic, cardiovascular, and neuropsychiatric disorders. Despite these contributions, many studies exhibited notable limitations, including small sample sizes, questionable accuracy in reporting health outcomes, and issues with the selection of control groups. Such methodological shortcomings may have led to the misinterpretation of some findings. Ongoing and recent famines in regions such as Sudan, Somalia, and Gaza-driven by conflict and environmental disasters, including droughts and floods-represent some of the most pressing humanitarian crises of our time. Lessons from studies of the 20th-century Dutch and Chinese famines can inform the design of future research on the biological and intergenerational consequences of famine and trauma. Improved study designs will enhance the ability to generate reliable evidence and guide global health strategies for populations at risk of transgenerational effects from nutritional deprivation.