NHANES Data Highlight Growing Severe Obesity Burden in US Adults

Key Takeaways

• According to the National Health and Nutrition Examination Survey (NHANES), 40.3% of US adults had obesity in the period August 2021-August 2023, including 9.7% with severe obesity and 31.7% overweight, based on NHANES data.
• Obesity prevalence has risen markedly since 1960-1962, when obesity affected 13.4% of adults aged 20 to 74, demonstrating long-term upward trends.
• Differences persist across sex, age, and racial/ethnic groups, with non-Hispanic Black adults showing the highest obesity prevalence (52.1%) in the period 2021-2023.

The National Center for Health Statistics (NCHS) released new Health E-Stat data showing that obesity prevalence among US adults remains high, with 40.3% affected in the August 2021-August 2023 NHANES cycle. The report provides historical trends from 1960 through 2023 based on measured height and weight data.

Main News

The latest NHANES data indicate that 40.3% of adults aged 20 and older had obesity between August 2021 and August 2023, with 9.7% classified as severe obesity (BMI ≥40) and 31.7% overweight (BMI 25.0-29.9). The estimates were based on measured anthropometric data collected through standardized examinations, excluding pregnant individuals and those with missing height or weight data.

Long-term trends show a dramatic rise in obesity over 6 decades. Among adults aged 20 to 74, obesity prevalence increased from 13.4% in the period 1960-1962 to approximately 40.8% in 2021-2023. Severe obesity, nearly nonexistent in early surveys (0.9% in 1960-1962), rose to over 10% in the latest period.

Sex differences were observed in the survey, with obesity affecting 39.3% of men and 41.4% of women in 2021-2023. Age-specific data show the highest prevalence among adults aged 40 to 59 (46.4%), compared with 35.5% among those aged 20 to 39 and 38.9% among adults aged 60 and older.

Racial and ethnic disparities persist. In the latest cycle, obesity prevalence was 52.1% among non-Hispanic Black adults, 48.0% among Mexican American adults, 44.0% among Hispanic adults overall, and 39.3% among non-Hispanic White adults; estimates for non-Hispanic Asian adults were lower at 13.1%.

Clinical Implications

These findings highlight sustained, high prevalence of obesity in the US, with implications for chronic disease burden, health care utilization, and cost management. Obesity is associated with increased risk for cardiovascular disease, diabetes, and other comorbidities, making population-level trends particularly relevant for payers and managed care organizations planning preventive strategies.

The marked rise in severe obesity is especially concerning, as this subgroup often requires intensive interventions, including pharmacotherapy or bariatric procedures, which can significantly affect healthcare spending. Additionally, the persistent disparities by race, ethnicity, and age underscore the need for targeted population health initiatives and culturally tailored interventions.

For managed care stakeholders, the data reinforce the importance of screening, early intervention, and value-based care models that address obesity as a chronic condition. NHANES’ standardized methodology, including measured height and weight and nationally representative sampling, provides robust evidence for policymakers and health care systems to guide resource allocation.

The authors note that BMI remains the primary measure for classifying overweight and obesity, although body fat and health risks may vary by sex, age, and race. Research cited in the report indicates that health risks may occur at lower BMI levels among Asian populations and that BMI may overestimate adiposity among Black individuals.

Conclusion

NHANES data from the period 2021-2023 confirm that obesity prevalence remains high among US adults, with persistent disparities and increasing severe obesity rates. Continued surveillance and targeted interventions will be essential to mitigate long-term health and economic impacts.

Reference

Fryar CD, Afful J, Saif NT. Prevalence of overweight, obesity, and severe obesity among adults age 20 and older: United States, 1960–1962 through August 2021–August 2023. NCHS Health E-Stat. 2026 Feb;(111):1-7. Doi: https://dx.doi.org/10.15620/cdc/174643