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Global burden of obesity in 2005 and projections to 2030



To estimate the overall prevalence and absolute burden of overweight and obesity in the world and in various regions in 2005 and to project the global burden in 2030.


Pooling analysis

Data Sources:

We identified sex- and age-specific prevalence of overweight and obesity in representative population samples from 106 countries, which cover approximately 88% of the world population, using MEDLINE and other computerized databases, supplemented by a manual search of references from retrieved articles.


Sex- and age-specific prevalence of overweight and obesity were applied to the 2005 population to estimate the numbers of overweight and obese individuals in each country, each world region and the entire world. In addition, the prevalence, with and without adjusting for secular trends, were applied to the 2030 population projections to forecast the number of overweight and obese individuals in 2030.


Overall, 23.2% (95% confidence interval 22.8–23.5%) of the world's adult population in 2005 was overweight (24.0% in men (23.4–24.5%) and 22.4% in women (21.9–22.9%)), and 9.8% (9.6–10.0%) was obese (7.7% in men (7.4–7.9%) and 11.9% in women (11.6–12.2%)). The estimated total numbers of overweight and obese adults in 2005 were 937 million (922–951 million) and 396 million (388–405 million), respectively. By 2030, the respective number of overweight and obese adults was projected to be 1.35 billion and 573 million individuals without adjusting for secular trends. If recent secular trends continue unabated, the absolute numbers were projected to total 2.16 billion overweight and 1.12 billion obese individuals.


Overweight and obesity are important clinical and public health burdens worldwide. National programs for the prevention and treatment of overweight, obesity and related comorbidities and mortalities should be a public health priority.

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This study was partially supported by a grant (R01 HL68057) from the National Heart, Lung, and Blood Institute, Bethesda, MD, USA. Dr Reynolds was partially supported by a Building Interdisciplinary Research Careers in Women's Health Scholarship (K12 HD43451) cofunded by the Office of Research on Women's Health (ORWH) and the Office of Dietary Supplements (ODS), National Institutes of Health, Bethesda, MD, USA.

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Correspondence to J He.

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Kelly, T., Yang, W., Chen, CS. et al. Global burden of obesity in 2005 and projections to 2030. Int J Obes 32, 1431–1437 (2008).

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