Race does not biologically determine health outcomes, but it powerfully predicts them. The gaps are stark: life expectancy in the U.S. ranges from 70.1 years for American Indian and Alaska Native people to 85.2 years for Asian people, a 15-year spread. These differences are not written into DNA. They emerge from the accumulated effects of where people live, what care they can access, how they’re treated by the medical system, and the chronic stress of navigating social disadvantage.
Race Is a Social Category, Not a Biological One
The National Human Genome Research Institute defines race as a social construct used to group people based on physical appearance, social factors, and cultural backgrounds. It was built as a hierarchical system to classify and distinguish groups, not as a reflection of meaningful biological divisions. The key genetic finding is this: there is more genetic variation within any self-identified racial group than between racial groups. Two people who both identify as Black may be more genetically different from each other than either is from someone who identifies as White.
That doesn’t mean ancestry is irrelevant to health. Geographic ancestry can influence which gene variants a person carries, affecting things like how they metabolize certain medications or their predisposition to specific conditions like sickle cell disease. But ancestry and race are not the same thing. Ancestry is a precise description of geographic lineage. Race is a broad, shifting social label. Conflating the two has led to decades of flawed assumptions in medical research and clinical care.
The Disparities Are Real and Measurable
Even though race is socially constructed, the health gaps it tracks are not abstract. Black Americans have a life expectancy of 74.0 years compared to 78.4 for White Americans and 81.3 for Hispanic Americans. For Black men specifically, life expectancy drops to 70.3 years. American Indian and Alaska Native men fare worst at 66.7 years.
Maternal mortality illustrates the disparity in its most extreme form. In 2023, Black women died from pregnancy-related causes at a rate of 50.3 per 100,000 live births. For White women, that rate was 14.5. For Hispanic women, 12.4. For Asian women, 10.7. A Black woman in the U.S. is roughly 3.5 times more likely to die from childbirth than a White woman, and this gap persists even when controlling for income and education.
Chronic disease follows similar patterns. The age-adjusted rate of diabetes is 12.5% among Black and Hispanic adults compared to 7.8% among White adults. Hypertension is more common in Black Americans (32.8% vs. 24% for White Americans) and more likely to remain uncontrolled after diagnosis. Among patients diagnosed with high blood pressure, only 56.7% of Black patients had it under control, compared to 67.2% of White patients.
What Actually Drives the Gaps
If genetics don’t explain these differences, what does? The answer involves overlapping systems that sort people into different living conditions, stress levels, and quality of care based on racial identity.
Insurance coverage is one of the most direct mechanisms. In 2023, 17.9% of Hispanic people and 18.7% of American Indian and Alaska Native people under age 65 were uninsured, more than two and a half times the rate for White people (6.5%). Being uninsured means skipping preventive care, delaying treatment, and managing chronic conditions without consistent medical support. These are not individual choices. They reflect employment patterns, state-level policy decisions about Medicaid expansion, and historical exclusion from employer-sponsored coverage.
Neighborhood conditions matter enormously. Residential segregation, shaped by decades of housing policy, concentrates Black and Hispanic families in areas with fewer grocery stores, more environmental pollutants, less green space, and underfunded hospitals. These conditions raise baseline rates of asthma, heart disease, and diabetes before anyone ever sees a doctor.
How Chronic Stress Gets Under the Skin
The weathering hypothesis, developed by public health researcher Arline Geronimus, describes how chronic exposure to social and economic disadvantage accelerates normal aging. The idea is that the cumulative burden of navigating racism, financial insecurity, and social marginalization wears down the body over time, leading to earlier onset of conditions typically associated with older age.
The biological evidence supports this. Studies measuring telomere length (a marker of cellular aging) found that Black women had shorter telomeres than White women of the same age, and the difference was partially explained by perceived stress and poverty. Other research using epigenetic markers found that lower income accelerated biological aging in Black women compared to those with higher income. The body keeps a running tab of chronic stress through elevated hormones, inflammation, and cardiovascular strain. Over years and decades, this translates into higher rates of heart disease, stroke, preterm birth, and other conditions.
This matters because it reframes racial health gaps as the consequence of environments and experiences, not inherent vulnerability. A person’s body ages faster not because of their racial category but because of what that category exposes them to in a society organized around it.
Bias Inside the Medical System
Disparities don’t only come from outside the clinic. They’re reinforced within it. In emergency departments, Black patients are prescribed opioids for acute pain at lower rates than White patients presenting with the same complaints. Retrospective studies across Veterans Administration and Medicaid databases have found persistent underprescribing of pain medication to Black patients. This pattern has roots in false beliefs, some still circulating in medical training, about biological differences in pain tolerance between racial groups.
Clinical tools have also embedded race in ways that affect care. For years, the standard formula for estimating kidney function included a race-based adjustment that systematically rated Black patients as having better kidney function than they actually did. This meant Black patients could be sicker before qualifying for specialist referrals or transplant lists. In 2021, the American Society of Nephrology and the National Kidney Foundation issued recommendations to remove race from the equation entirely, replacing it with a formula based only on age, sex, and a standard blood marker. Nephrology became the first specialty to strip race from a widely used clinical algorithm, and other fields are now examining their own tools.
Why the Framing Matters
Saying “race determines health outcomes” implies something fixed and inevitable. The more accurate statement is that racism, operating through housing, employment, insurance, environmental exposure, clinical bias, and chronic stress, determines health outcomes. Race is the axis along which these forces sort people, but it is not the cause.
This distinction changes what solutions look like. If race were a biological driver, the response would be race-specific medicine. If the drivers are social and systemic, the response is expanding insurance coverage, enforcing fair housing, funding under-resourced hospitals, removing biased algorithms, and training clinicians to recognize how their assumptions shape the care they provide. The 15-year life expectancy gap between the longest- and shortest-lived racial groups in the U.S. is not a fact of nature. It is a product of policy, history, and ongoing inequity.