I am less assured, however, about how a different public health crisis ends. It is a crisis that has persisted for generations at a tragic cost. To understand this challenge, you only need five numbers: a zip code. Far more than our family histories or genetic code, our zip code—the place we call home—remains the single greatest predictor of long-term health and life expectancy.  

Consider Washington, D.C. The difference in life expectancy between our national capital’s longest-lived zip code, 20088, and its shortest, 20020, is a staggering 32.9 years. Yet the physical distance from tony Friendship Heights to hard-pressed Barry Farm is less than 10 miles. This disparity shows how health is profoundly shaped by our environment: the air we breathe, the food we eat, the services we have access to, the opportunities afforded to us. 

We refer to these factors as the social determinants of health. But beneath the surface of this term lies an ugly truth. It is not a coincidence that Friendship Heights is a majority-White neighborhood, while Barry Farm is predominantly Black. Nor is it a fluke that similar racial disparities show up in neighborhoods across Chicago, New York, Los Angeles, and other major cities. Up close, when we study social determinants of health, what we are really studying are the enduring health consequences of racist policies and prejudice encoded in our society. 

If you are not convinced, consider these facts: Food deserts—when income is accounted for—occur more frequently in Black neighborhoods; Black Americans, owing to residential segregation, are more likely to breathe polluted air and drink lead-poisoned water; Black households with children still hold just one cent of wealth for every dollar held by an average White family; schools in minority districts receive an average of $2,226 less per student per year than those in White-majority districts, a gap that adds up to billions of dollars; Black Americans are incarcerated at five times the rate of White Americans—an outcome fueled, in part, by a disturbing “school-to-prison” pipeline. And the list of inequities goes on.

These are the bitter fruits of racial prejudice, the same I encountered growing up in Little Rock, where, in junior high, I was bused from my majority-White school to a school across town as part of a court-ordered desegregation plan. It was the first time I viscerally experienced the lie that was “separate but equal.” The tragic reality—that segregation engenders inequity—lay exposed in the school’s scarcely stocked library, where rats had visibly damaged books on the shelves, between the missing rails of stairwells, and behind the plaster peeling from the walls. 

Though decades have passed since then, historically marginalized communities continue to bear the extreme financial and health costs of systemic exclusion and neglect. In every sense, it is a public health crisis—most recently exposed by COVID-19 and by the murder of George Floyd, which awoke many in our nation to the malignant nature of racial injustice. 

If we are to achieve meaningful change, we as a medical community—and a country—must see “social determinants” for what they truly are. Ten miles and a 30-year gap in life expectancy: This should not be the legacy we leave for future generations. How can we make a difference against decades of racist policies that have brought us to this pass? For the nation’s teaching hospitals and academic health centers like Stanford Medicine, we must embrace three crucial avenues of change.

First, we must make social determinants a distinct research priority. To that end, we should publicly report the annual percentage of our research portfolios dedicated to advancing the understanding of social determinants, their health effects, and—critically—how to intervene. We should likewise set clear benchmarks to grow this body of work over time.

A second and no less critical priority arises from our core mission as instructional institutions. As we train tomorrow’s physician leaders, we must strive to extend educational opportunities to promising students from underrepresented communities. A more diverse physician workforce is essential to enhancing the cultural competence of care that patients receive and improving access in under-resourced areas. 

As a path to bolstering applicant diversity and encouraging graduates to pursue their passions, Stanford Medicine has committed to providing debt-free education—including living expenses—for all medical students based upon financial need. Accredited colleges and universities must similarly address student debt as an urgent mandate. In addition, medical schools must include instruction on how to engage patients about social determinants, how implicit bias affects patient-clinician interactions, and the consequences of racism on human health.

Finally, in the care we provide, we must make lasting commitments to increasing community-based programs focused on equitable outcomes and expanding access. Treating those who are underserved and dispossessed when they come to the Emergency Department with life-threatening conditions is a bare minimum. We must find ways to systematically prevent such occurrences from happening in the first place—and this commitment must be shared by health insurance providers. 

This, however, is only a start. Advocating for nutritious eating makes a scant difference in a food desert. Praising the benefits of physical exercise helps little when jogging in a nearby neighborhood could cost your life. And warnings about the dangers of drug and alcohol abuse will hardly be heard in areas devoid of opportunity and hope. These challenges will not be solved by medicine alone. As a society, we have been shaken to our core by the recent injustices we have witnessed; we cannot look away. We must confront and address through policy the systemic inequities that have turned our zip codes into such powerful predictors of human health.

Lloyd B. Minor is a scientist, surgeon, and the Carl and Elizabeth Naumann dean of the Stanford University School of Medicine. He is also the author of Discovering Precision Health.