© 2003 American Public Health Association
The author is with the Department of Health and Social Behavior and the Harvard Center for Society and Health, Harvard School of Public Health, Boston, Mass. Correspondence: Requests for reprints should be sent to Nancy Krieger, PhD, Department of Health and Social Behavior, Harvard School of Public Health, 677 Huntington Ave, Boston, MA 02115 (e-mail: nkrieger{at}hsph.harvard.edu).
Research on racism as a harmful determinant of population health is in its infancy. Explicitly naming a long-standing problem long recognized by those affected, this work has the potential to galvanize inquiry and action, much as the 1962 publication of the Kempe et al. scientific article on the "battered child syndrome" dramatically increased attention toand prompted new research onthe myriad consequences of child abuse, a known yet neglected social phenomenon. To further work on connections between racism and health, the author addresses 3 interrelated issues: (1) links between racism, biology, and health; (2) methodological controversies over how to study the impact of racism on health; and (3) debates over whether racism or class underlies racial/ethnic disparities in health.
DID CHILD ABUSE EXIST before 1962, when C. Henry Kempe and coauthors published the now classic article "The Battered-Child Syndrome"?1 Certainly.25 Did it harm health? Yes, if current research is any guide.27 Before the Kempe et al. article catapulted the issue onto the mainstream US medical and public health agenda, had anyone previously raised concerns about child abuse? Absolutely. Since the early 1800s, numerous individuals and organizationsmany in fields that came to be known as public health, medicine, social work, philanthropy, and criminal justicehad attempted to investigate, raise public awareness about, and ameliorate problems of family violence.2,3,5 Public and scientific attention to the issue, however, waxed and waned in concert with broader societal concerns.2,3 Kempes article in a prominent scientific journal nevertheless was and remains enormously influential. Why? In part, because it explicitly namedand simultaneously highlighted the health consequences ofa volatile societal problem then hidden from view by dominant beliefs about the sanctity of family life. The unnamable problem, once named, became less nebulous and more tangible, something that could be more rigorously documented, monitored, and analyzed, bolstered by the belief thatwith adequate will and resourcesit could ultimately be rectified.47 Forty years later, in 2002, we are reaching a similar juncture: the unnamable is again becoming named, and explicit investigation of racism as a harmful determinant of population health is gaining entry into mainstream public health and medical discourse. At issue are the myriad ways in which racismand other forms of social inequality and discriminationcan adversely affect health across the life course via varied, intertwined economic, environmental, psychosocial, and iatrogenic pathways.812 The scientific question "Does racism harm health?" prompts a plenitude of hypotheses, each meriting serious scientific attention and resources. Is it, however, novel to posit that racial/ethnic disparities in health arise from inequitable race relations? Surely not.13,14 Are we the first to suggest that health is harmed not only by heinous crimes against humanity, such as slavery, lynching, and genocide, but also by the grinding economic and social realities of what Essed has aptly termed "everyday racism"?15 Once again, no. In the mid-1800s, leading US abolitionists and physicians, Black and White alike, challenged convention by arguing that the poorer health of the Black relative to the White population resulted not from innate inferiority but rather White privilege, enforced via slavery in the South and legal racial discrimination in the North.13,14 The Choctaw and Cherokee nations, forcibly evicted from their homelands after the US Congress passed the Indian Removal Act in 1830, likewise understood that their health was being decimated by not only territorial but also cultural dispossession, justified in the name of White supremacy.1618 Concerns about health consequences of racism clearly are not new; to suggest otherwise is to misstate the historical record. Rather, reflecting the historical impact of racial inequality on not only health but also health sciences, the stark reality is that, despite long-standing awareness of the problem, the serious scientific study of racism as a determinant of population health remains in its infancy. One way to move to the next stage is to consider current conceptual issues in the field, given that scientific knowledge is more often spurred by clarification of our thinking than by technological breakthroughs.19,20 In this spirit, I address 3 interrelated issues from the vantage of an epidemiologist guided by an ecosocial perspective2123: (1) links between racism, biology, and health, including recognition of biological expressions of race relations and racialized expressions of biology; (2) methodological controversies over how to study the impact of racism on health; and (3) debates over whether racism or class underlies racial/ethnic disparities in health.
Clarity of terminology is critical for any science. A first step for analyzing the contribution of racism to racial/ethnic disparities in health is being explicit about definitions of racism, race/ethnicity, and the link between these concepts.8,23 In essence, both are interdependent expressions of inequitable and institutionalized societal race relations.2426 More specifically, racism refers to institutional and individual practices that create and reinforce oppressive systems of race relations whereby people and institutions engaging in discrimination adversely restrict, by judgment and action, the lives of those against whom they discriminate.8,15 Race/ethnicity, in turn, is a social rather than a biological category, referring to social groups, often sharing cultural heritage and ancestry, that are forged by oppressive systems of race relations justified by ideology. One group benefits from dominating other groups and defines itself and others through this domination and the possession of selective and arbitrary physical characteristics (e.g., skin color).8,9 Although once trumpeted as scientific "fact," the notion that "race" is a valid, biologically meaningful a priori category has long beenand continues to berefuted by work in population genetics, anthropology, and sociology.2634 The fact that we know what "race" we are says more about our society than it does our biology.35 Why do these sorts of explicit definitions matter? Because they provide a conceptual foundation for integrating thinking about racism and biology as a means of understanding and investigating the impact of racism on health. Both matter. Two diametrically opposed constructs are at issue, constructs that nevertheless are routinely conflated in the scientific literature. The first is biological expressions of race relations; the second is racialized expressions of biology.8,23,36 The former draws attention to how harmful physical and psychosocial exposures due to racism adversely affect our biology, in ways that ultimately are embodied and manifested in racial/ethnic disparities in health. The latter refers to how arbitrary biological traits are erroneously construed as markers of innate "racial" distinctions. Consider skin color. The biology of pigmentation and its direct relationship to certain skin-related disorders is real.37,38 Whether or not racism existed, people with lighter vs darker skin (i.e., less vs more dispersed melanosomes) would be at higher risk of malignant melanoma, given sufficient exposure to sunlight (and especially bad sunburns before puberty).38,39 By contrast, damage resulting from adverse use of skin lightening products,38 as prompted by the ideology that lighter is better, would constitute a biological expression of race relations. Skin color, in turn, would become a racialized expression of biology if, absent any evidence, it were treated as a valid marker for other unspecified genetic traits, reflecting a presumption that the biology of "race" equals the biology of gene frequencies. This was the logic of the flawed research agenda egregiously exemplified by the Tuskegee syphilis study, unnaturally intended to determine whether the "natural history" of untreated syphilis in Blacks was the same as that previously observed in Whites, in light of hypothesized differences in their nervous systems.40,41 As Cruickshank42 has recently pointed out, however, drawing on lessons from the Human Genome Project and systems biology,43,44 it is a logical and biological fallacy to assume that gene expression is equivalent to gene frequency. Consider the recent, rapid secular changes in obesity, hypertension, and diabetes among populations of West African descent living in the United Kingdom, the Caribbean, and the United States, as well as in West Africa,4551 to use but one diasporic example. Only changes in gene expression, not gene frequency, can explain the speed of these trends. Even so, myriad epidemiological studies continue to treat "race" as a purely biological (i.e., genetic) variable or seek to explain racial/ethnic disparities in health absent consideration of the effects of racism on health.811,52 By clearly distinguishing between and emphasizing the importance of taking into account both racism and biology, these 2 constructs make clear that we can never study human biologyor behaviorin the abstract. Exemplifying that we instead study people in context is Sapolskys cautionary tale53: If adrenal glands are studied only among cadavers of the poor, long since hypertrophied as a result of excess excretion of cortisol, thenas occurred in the early 20th centurythe wealthy will be diagnosed with adrenal deficiency disorders. Simplistic divisions of the social and biological will not suffice.54 The interpretations we offer of observed average differences in health status across socially delimited groups reflect our theoretical frameworks, not ineluctable facts of nature.
How then, methodologically, can we test the hypothesis that racism harms health? Addressing this scientific question raises several critical questions and controversies. At issue is the need forand strengths and limitations ofstudies that directly and indirectly assess the impact of racism on health, whether employing quantitative or qualitative methods.812,55 By direct, I mean health studies explicitly obtaining information on peoples selfreported experiences ofand observing peoples physiological and psychological responses toreal-life or experimental situations involving racial discrimination.8 By indirect, I mean studies that investigate racial/ethnic disparities in distributions of deleterious exposures or health outcomes and explicitly infer that racism underlies these disparities.8 Each approach has its flaws, and both are necessary, addressing questions the other cannot. Highlighting why both direct and indirect approaches are necessary are 5 key pathways through which racism can harm health, by shaping exposure and vulnerability to the following: (1) economic and social deprivation; (2) toxic substances and hazardous conditions; (3) socially inflicted trauma (mental, physical, and sexual, directly experienced or witnessed, from verbal threats to violent acts); (4) targeted marketing of commodities that can harm health, such as junk food and psychoactive substances (alcohol, tobacco, and other licit and illicit drugs); and (5) inadequate or degrading medical care.8 Also relevant are health consequences of peoples responses to discrimination. These responseseach with its own set of potential health impactscan range from internalized oppression and harmful use of psychoactive substances to reflective coping, active resistance, and community organizing to end discrimination and promote human rights and social justice.812,15,26,55 From this perspective, the direct approach is necessary for investigating pathways pertaining to socially inflicted trauma. There is no substitute. The caveat, well recognized in the enormous body of literature on "stress" and health, is that such research must reckon with not only exposures but perceptions of these exposures, as well as cognitive issues pertaining to memory and disclosure.8,12,5557 The scientific task is therefore to understand how various threats to validity can affect investigations relying on self-report data. Potential solutions include the following: research on what constitutes valid self-report measures of racial discrimination8,58; experimental studies (as conducted in the areas of housing and job discrimination) that employ "testers" of the same age, gender, and physical size, equipped with identical resumes but differing in terms of their race/ethnicity59,60; or psychological and criminal justice studies investigating differences in perception of and responses to designated scenarios.6163 Notably, conduct of such studies requires appraisal of participants racial/ethnic identity. Recent suggestions, however well intentioned, to "abandon" use of racial/ethnic categories in public health research, on grounds that "race" is not a valid scientific concept,64,65 err on 2 accounts.36,66,67 First, such an argument implies that only biological, and not social, variables are "real" and can be studied scientifically. Second, it presumes that the race/ethnicity of persons reporting experiences of racial discrimination is irrelevant, thereby rendering it impossible to distinguish betweenor evaluate the health effects ofracial discrimination reported by people of color and that reported by White people. The indirect approach, in turn, is necessary for most of the other pathways listed, precisely because they involve exposures that extend beyond individual perception.8,9 Knowledge of racial discrimination in wages, for example, can be obtained only if one knows what others are paid.59 Similarly, knowledge of racial inequality in the provision of medical care, above and beyond disrespectful interpersonal interactions, can be obtained only by comparing the types of treatment offered to groups that exhibit equivalent morbidity rates but differ in regard to their race/ethnicity.68,69 Herein lies the rub. A claim recently advanced by some social epidemiologists, notably Cooper and Kaufman, is that we cannot make causal inferences based on studies comparing health outcomes across different racial/ethnic groups.7072 Why? Because, they argue, such studies violate the counterfactual criterion of exchangeability. That is, people who are "exposed" should, in principle, be capable of being "unexposed." Using this logic, their debatable example is that smokers differ from nonsmokers only because they smoke72; in principle, the "treatment" of smoking could be randomized. By contrast, according to Cooper and Kaufman, there is no way a White person could ever be or become a Black person or have the lifetime set of related experiences contingent upon being Black. The exposure of "race" is thus nonexchangeable and also, in their examples, uniform.72 Because commonly used statistical tests presume exchangeability, they assert that parameter estimates for racial/ethnic contrasts have no valid causal interpretation, including in relation to racial discrimination. The fallacy of their argument is contained within their counterfactual propositions. Cooper and Kaufman in effect relegate "race" to an intrinsic trait.7375 They confuse the fact that people cannot simply "choose" their race/ethnicity, in that it is conditioned by the racial/ethnic relations of the society into which they are born, with the consequences of experiencing differentialand variabletreatment by virtue of inequitable race relations. The appropriate counterfactual is thus as follows: What would happen if people were randomized to discriminatory treatment, as occurs with racial discrimination? As is often the case in epidemiology, we cannot perform such an experiment to test this hypothesis regarding racial/ethnic disparities in health across the life course and instead must rely on observational studies. More broadly, the counterfactual contrast is of a world with and without racism.74 In the latter, people with darker vs lighter skin would in fact be "exchangeable"as human beingsand thus equally at risk for all ailments other than those directly involving skin color (e.g., melanoma, vitiligo38,39). This contrast, premised upon a common humanity, underlies the "tester" studies alluded to earlier regarding housing and job discrimination. It also underlies inferences made comparing health outcomes across birth cohorts; obviously, someone born in 1910 cannot be "exchanged" with or have the same set of experiences as a person born in 1940 or in 1970.74 Birth cohort comparisons of both rates of disease and exposures, however, are critical for assessing whether cross-sectional associationseven those derived from randomized clinical trialscan in fact explain secular changes in health.22,76 As with any scientific research, poorly specified counterfactuals are what threaten causal interpretation,7780 and all observational studiesnot only those concerned with social determinants of healthmust consider carefully their motivating counterfactuals.7779 Even the smokers and nonsmokers of Cooper and Kaufmans example would, after all, violate a strict "exchangeability" criterion, because the fact and process of being a smoker brings with it an array of other correlated exposures and life histories.81,82
The third and final conceptual controversy builds on the first and second. It is the debate over whether "racism" or "social class" explains racial/ethnic disparities in health and, relatedly, which is causally prior.814,52,65,67,7075,83,84 Typically argued with reference to the Euro-American legacy of colonization and the slave trade, the logical and historical fallacy is to frame this debate as "either/or" rather than as "both/and." As attested to by reams of sociological and historical research, class and race relations are in fact intertwined.26,33,34,8588 Since the global expansion of European power and economies in the mid-15th century and contingent territorial conquest and intercontinental slave trade, people have lived in a world of racialized class relations and class-contingent race relations.26,33,34,8588 It logically follows that racial/ethnic inequalities are shaped and fostered by class inequalities, and vice versa. The same holds for other types of discrimination that render people socially and economically vulnerable (e.g., discrimination based on gender or sexuality).8,8890 Translated to health research, it is therefore an empirical question, not a philosophical principle, whether pathways involving economic deprivation and/or noneconomic manifestations of racial discrimination contribute to racial/ethnic disparities in health. Or, put simply, the answer to the crude question "Which mattersrace or class?" can be one, the other, neither, or both. This is why we need scientific research: to test competing hypotheses.
In conclusion, recalling the example of child abuse, the point of explicitly naming and scientifically investigating racism as a determinant of population health is to generate valid knowledge to guide actions designed to improve public health. It is not to imply that racism is solely a public health or medical problem or that solutions will come primarily from public health or medical initiatives.91,92 Nor is health research required to "prove" that racism is "bad"; it is, by definition, and in many instances it is illegal as well.8 Rather, the point is that neglecting study of the health impact of racism means that explanations for and interventions to alter population distributions of health, disease, and well-being will be incomplete and potentially misleading, if not outright harmful.93,94 Of course, work in this field will, inevitably, be fraught with controversy, because the exposure raises important themes of accountability, agency, and human rights.8,9598 That there are legal, political, and economic consequences of attributing disparities in health status to racial discrimination is, however, no more or less germane than it is for research on any other determinant of societal health, whether child abuse,17 ambient air pollution,99,100 tobacco,101,102 or food.46,103 The canard that research on health consequences of racism is "political" rather than "scientific"104 is blatantly incorrect: it is in fact political and unscientific to exclude the topic from the domain of legitimate scientific inquiry and discourse.92,94,105 Nor is this insight new: James McCune Smith and John Rock, 2 of the first credentialed African American physicians in the United States, said as much a century and a half ago.13,14,106,107 Rather, the task at hand is to bring the knowledge and methods available in our generation to the pressing public health problem of persistent racial/ethnic disparities in health.
Peer Reviewed Accepted for publication September 19, 2002.
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