News Release

School segregation: Contributor to racial/ethnic childhood obesity disparities

Peer-Reviewed Publication

The Obesity Society

SILVER SPRING, Md.---Obesity gaps are larger between segregated schools and smaller in racially-integrated schools among child populations, according to a new study in Obesity, The Obesity Society’s (TOS) flagship journal. This is the first study to examine childhood obesity disparities specifically within integrated schools to begin to elucidate the role of school segregation in the racial/ethnic patterning of obesity among youth.

“School-level racial segregation matters for child health disparities. Programs and policies to reduce gaps in obesity early in life must prioritize socioeconomically disadvantaged schools, and segregated schools attended primarily by children of color,“ said Brisa N. Sánchez, PhD, MS, MSc, Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, Pa. Sánchez is the corresponding author of the study.

Recent studies have observed that racial or ethnic adult health disparities revealed in national data dissipate in racially integrated communities, supporting the theory that “place, not race” is a key driver of racial/ethnic health disparities. In other words, the characteristics of places and the systems or policies that influence place characteristics are more important than personal characteristics of individuals. This study tested this theory among children.

Publicly available overweight/obesity rates obtained from the California Department of Education (CDE) for fifth, seventh and ninth grade students attending state public schools in the 2018-2019 school year who participated in the California FitnessGram test were evaluated in this cross-sectional study for childhood obesity disparities. The FitnessGram is a physical fitness test required for all children in the aforementioned grades that is administered in the spring of the academic year.

The main outcome of interest is the body-composition assessment of the FitnessGram test. For this assessment, objectively measured height and weight are used to obtain children’s body mass index (BMI). BMI is then compared with the Centers for Disease Control and Prevention’s age- and sex-specific BMI reference distributions to categorize children into three groups: healthy fitness zone, needs improvement and high risk, which correspond  to the BMI categories of normal weight, overweight and obese.

More than 1.3 million students were involved in the body composition assessment of the FitnessGram test of whom 54% were Latino, 23% were White, 9.5% were Asian, 5.4% were Black and 2.4% were Filipino. Data for the five major racial/ethnic groups included in the study was collected in more than 8,900 schools. Other races/ethnicities were excluded from the study due to small sample sizes within schools that led to masking of most of their data.

Results showed disparities within integrated schools and between segregated schools. The overweight/obesity gap between Latino, Black and Filipino children compared with White children was larger between segregated schools, relative to disparities within integrated schools:

  • Whereas the disparity in overweight/obesity between Latino and White children was 22% when comparing Latino children in Latino-segregated schools to White children in White-segregated schools, the disparity narrowed to 11% when comparing rates between White and Latino children in integrated schools.
  • The statewide disparity in overweight/obesity prevalence between Black and White children was 18% when comparing Black children in Black-segregated schools to White children in White-segregated schools, but narrowed to 6% within integrated schools.
  • The disparity between Filipino and White children was 8% between segregated schools, but reversed to -1% within integrated schools.
  • Overweight/obesity differences between Asian and White children were similar statewide and between segregated schools.

“Findings from this study suggest school segregation can foster the development of obesogenic conditions that disproportionately affect Latino, Black and Filipino childrens’ obesity risks. While this study sheds light into the importance of school segregation, further research is needed to identify the mechanisms through which racial/ethnic integration and segregation in schools influence the current disparities in childhood obesity rates,” said Liliana Aguayo, PhD, MPH, an expert in childhood obesity disparities, TOS member and research assistant professor at Emory University's Hubert Department of Global Health in Atlanta, Ga. Aguayo was not associated with the research.

The study’s authors add that future research should examine the joint role of individual-level economic factors and racial/ethnic segregation to shed additional light on disparities and ways to reduce them. The researchers add that they were unable to conduct analyses that jointly examine economic and racial/ethnic disparities because the publicly available data from the CDE does not allow cross-classification of these factors within schools. Future research should also employ analytical approaches to disentangle the confounding effects of segregation and person-level race/ethnicity and produce valid estimates of individual-level disparities attributable to person-level factors, and, thus amenable to individual-level interventions, instead of disparities driven by segregation and concomitant place-based or structural interventions. Given findings from this and previous studies, estimating disparities within more granular levels of geography is critical to more accurately assess environmental determinants of disparities.

Other authors of the study include Nuha Mahmood of the University of Michigan Medical School, University of Michigan, Ann Arbor; Emma Sanchez-Vaznaugh, San Francisco University, San Francisco, Calif; and Mika Matsuzaki of Johns Hopkins University School of Public Health, John Hopkins University, Baltimore, Md.

The study, titled “Racial/Ethnic Disparities in Childhood Obesity: The Role of School Segregation,” will be published in the May 2022 print issue.

The authors declared no conflict of interest.

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The Obesity Society (TOS) is the leading organization of scientists and health professionals devoted to understanding and reversing the epidemic of obesity and its adverse health, economic and societal effects. Combining the perspective of researchers, clinicians, policymakers and patients, TOS promotes innovative research, education and evidence-based clinical care to improve the health and well-being of all people with obesity. For more information, visit

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