Why Your ZIP Code Predicts Health More Than DNA

If you want to predict someone’s life expectancy, don’t bother asking about their DNA. Ask for their ZIP code.

This is the core message behind a new report from the World Health Organization. It’s also a long-overdue challenge to the way the average person and policy maker typically thinks about health, especially in high-income countries like the United States. Government and individuals pour resources into health care services, gene therapies, supplements, and wearable devices, while mostly ignoring the basic truth that the most effective and lasting improvements in population health come from changing the conditions in which people live, work, and age.

That means changing the rules that shape our environment, our economy, and our social fabric.

The WHO report offers a comprehensive framework. It recommends policies to address economic inequality, strengthen public services, and dismantle systems of discrimination. It calls for governments to regulate harmful commercial practices and ensure that emerging trends—like climate action and digital transformation—advance equity rather than widen gaps. Most importantly, it underscores a hard truth: health equity is a political choice. The social determinants of health, as they are commonly known, should more accurately be labeled political and commercial determinants of health.

That choice doesn’t just live in Washington or Geneva. It plays out in local zoning boards deciding where affordable housing gets built. It plays out in school boards deciding on lunch programs, health curricula, and indoor air quality. And it plays out in businesses that either choose to uphold decent labor practices or exploit loopholes that keep wages low and conditions unsafe.

What we need is a whole-of-government and whole-of-society shift. That includes embedding health equity into every level of decision-making, not as an afterthought but as a design principle. It means evaluating public policies based on whether they help or harm health across different groups—and especially those who have been historically excluded or disadvantaged.

In other words, we need to stop mistaking health care for health.

Until we take social, commercial, and environmental determinants seriously, we’ll keep spending more and getting less. The good news? We already know what works. The bad news? Here in the U.S., the current administration talks about protecting Americans from dangerous substances and addressing the rising incidence of chronic diseases. But the programs the Trump Administration is cutting and the policies it’s enacting will make our health worse.