Wändi Bruine de Bruin sat down to analyze survey data from 124,003 people across 121 countries—a sweeping global portrait—and found something startling: the link between clean drinking water and having enough food to eat is unbreakable, even in wealthy nations. The researchers from the University of Southern California and the International Water Management Institute, publishing their findings in Nature Food, discovered that people without access to clean drinking water are significantly more likely to experience food insecurity and food safety threats, a connection that cuts across country income levels and upends the assumption that these are separate crises.
The study matters because water and food insecurity are usually tackled in isolation, handled by different government agencies, nonprofits, and international organizations—a structural fragmentation that leaves millions vulnerable on both fronts. As Bruine de Bruin, Provost Professor of Public Policy, Psychology, and Behavioral Science at the USC Price School of Public Policy, says: "Even if you live in a wealthy country, if you lack access to clean drinking water, you are more likely to lack access to food." This isn't a story about distant poverty alone. It's about interconnected systems collapsing together, everywhere.
The reasons are both practical and structural. Without clean water, families cannot safely prepare food—a basic requirement for survival that becomes impossible without this foundation. Poor infrastructure, climate change, poverty, homelessness, and conflict create environments where both water and food systems fail simultaneously. And when households must choose where to spend scarce money and time, the competing demands of securing water and securing food pit survival against survival. For families on the margins, every dollar and every hour is already spoken for.
Rachael McDonnell, Deputy Director General of the International Water Management Institute and co-author of the study, frames the challenge starkly: "Water insecurity, food insecurity, and food safety are too often siloed as distinct challenges—and mistakenly presumed to be burdens borne only by low- and middle-income nations." Her statement carries an implicit warning. If these issues remain fragmented, the solutions will never reach scale or urgency. Governments, humanitarian organizations, and public health leaders must begin treating water and food access as a single interconnected crisis rather than parallel problems.
The researchers point to expanded water infrastructure investment, improved sanitation systems, and community-based public health programs—especially in vulnerable regions—as essential steps. But they stress something deeper: policymakers must strengthen collaboration across water, food, and other sectors to address these overlapping challenges. The study arrives at a sobering moment. Climate change, population growth, and mounting pressure on freshwater supplies threaten to intensify both water and food insecurity, particularly in low-resource communities already stretched thin. Drought, extreme weather, and declining supplies could make scarcity the norm rather than the exception.
This research joins a growing body of evidence that access to clean drinking water is fundamental not merely for health and sanitation, but for nutrition, food safety, and economic stability. The implication is clear: water access isn't a luxury or even a separate health issue. It's the foundation upon which everything else—food security, dignity, health, economic possibility—is built. Protecting both water and food systems together, as the researchers urge, isn't idealistic. It's essential.