• Overview
  • Obesity prevalence
  • Trends over time
  • Contextual factors
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Obesity prevalence

Adults, 2024

Survey type:Measured
Age:20+
Sample size:13,106
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. National Health and Nutrition Survey (NHNS) Japan, 2024. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/eiyou/r6-houkoku_00001.html [Accessed 07.10.26]
Notes:English summary currently unavailable.
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity
Cutoffs:Japanese Society for the Study of Obesity Cutoffs
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2024

Survey type:Measured
Age:20+
Sample size:13,106
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. National Health and Nutrition Survey (NHNS) Japan, 2024. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/eiyou/r6-houkoku_00001.html [Accessed 07.10.26]
Notes:English summary currently unavailable.
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. However, as this study reports BMI using standard cutoffs (Overweight: BMI =>25-29.9 & Obesity: => 30) this is shown here to allow for comparison with non-Asian WHO cutoffs. Data using the Japanese Society for the Study of Obesity cutoffs are shown below.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2023

Survey type:Measured
Age:20+
Sample size:4012
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2023
Notes:English summary currently unavailable. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001228532&stat_infid=000040275976&cycle_facet=cycle&tclass2val=0&metadata=1&data=1
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. As this study reports BMI by 25-29.9 & 30 this is shown here to allow for comparison with non-Asian WHO cutoffs.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2023

Survey type:Measured
Age:20+
Sample size:4012
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2023
Notes:English summary currently unavailable. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001228532&stat_infid=000040275976&cycle_facet=cycle&tclass2val=0&metadata=1&data=1
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity
Cutoffs:Japanese Society for the Study of Obesity Cutoffs
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2022

Survey type:Measured
Age:20+
Sample size:3939
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2022
Notes:English summary currently unavailable. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001228531&stat_infid=000040276311&cycle_facet=cycle&tclass2val=0&metadata=1&data=1
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. There are four grades of obesity, while WHO standard cutoffs have three grades of obesity. There is no overweight category.
Cutoffs:Japanese Society for the Study of Obesity Cutoffs
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2022

Survey type:Measured
Age:20+
Sample size:3939
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2022
Notes:English summary currently unavailable. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001228531&stat_infid=000040276311&cycle_facet=cycle&tclass2val=0&metadata=1&data=1
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. As this study reports BMI by 25-29.9 & 30 this is shown here to allow for comparison with non-Asian WHO cutoffs.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2019

Survey type:Measured
Age:20+
Sample size:4273
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2019 (English Summary) . Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/download_files/eiyouchousa/2019.pdf (last accessed 22.09.22)
Notes:Excel results with a breakdown of BMI 25-29.9 & 30=> available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001148507&tclass2val=0
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. As this study reports BMI by 25-29.9 & 30 this is shown here to allow for comparison with non-Asian WHO cutoffs.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2019

Survey type:Measured
Age:20+
Sample size:4273
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2019 (English Summary) . Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/download_files/eiyouchousa/2019.pdf (last accessed 22.09.22)
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. There are four grades of obesity, while WHO standard cutoffs have three grades of obesity. There is no overweight category.
Cutoffs:Japanese Society for the Study of Obesity Cutoffs
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2018

Survey type:Measured
Age:20+
Sample size:5234
Area covered:National
Список литературы:National Health and Nutrition Survey, 2018 published by the Ministry of Health, Labor and Welfare. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/download_files/eiyouchousa/2018.pdf (last accessed 17.05.21)
Definitions:The Japanese Society for the Study of Obesity cutoffs define BMI ≥ 25 as obesity. This is shown here as overweight and obesity to allow comparison with non-Asian cutoffs.
Cutoffs:Japanese Society for the Study of Obesity Cutoffs
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2017

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2012

Survey type:Measured
Age:20+
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Notes:*Since the surveys in 2012 and 2016 were conducted with a larger number of subjects than the regular surveys, weighting was applied to correct the difference in the number of households in each prefecture between the regular survey year and the 2012 and 2016 surveys in order to compare the results with the regular survey year, and the results were calculated as nationally adjusted values.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2007

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2002

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 2000

Survey type:Measured
Age:20+
Sample size:15000
Area covered:National
Список литературы:Asia Pacific Cohort Studies Collaboration. The burden of overweight and obesity in the Asia-Pacific region. Obesity Reviews 2007;8:191-196.
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1997

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1992

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1987

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1986-1990

Survey type:Measured
Age:20+
Список литературы:Yoshiike N, Seino F, Tajima S, Arai Y, Kawano M, Furuhata T, Inoue S. Twenty-year changes in the prevalence of overweight in Japanese adults: The National Nutrition Survey 1976-95. Obesity Reviews 2002;3:183-190
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1982

Survey type:Measured
Age:20+
Sample size:Large National Survey
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1981-1985

Survey type:Measured
Age:20+
Список литературы:Yoshiike N, Seino F, Tajima S, Arai Y, Kawano M, Furuhata T, Inoue S. Twenty-year changes in the prevalence of overweight in Japanese adults: The National Nutrition Survey 1976-95. Obesity Reviews 2002;3:183-190
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1977

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1976-1980

Survey type:Measured
Age:20+
Список литературы:Yoshiike N, Seino F, Tajima S, Arai Y, Kawano M, Furuhata T, Inoue S. Twenty-year changes in the prevalence of overweight in Japanese adults: The National Nutrition Survey 1976-95. Obesity Reviews 2002;3:183-190
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Adults, 1973

Survey type:Measured
Age:20+
Sample size:Large National Survey
Area covered:National
Список литературы:Japanese National Health and Nutrition Survey 1973-2019. Available at https://www.nibiohn.go.jp/eiken/kenkounippon21/eiyouchousa/keinen_henka_shintai.html (Summary data available in English). Last accessed 04.09.24
Unless otherwise noted, overweight refers to a BMI between 25kg and 29.9kg/m², obesity refers to a BMI greater than 30kg/m².

Children, 2023

Survey type:Measured
Age:6-14
Sample size:357
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2023
Notes:English summary currently unavailable. NB: VERY SMALL SAMPLE SIZE
Definitions:Determination of obesity by school health statistics survey method. The degree of obesity in 6 to 14 years old was determined from the standard weight by age and height. Degree of obesity (overweight) = (measured weight (kg) - standard weight by height (kg)) / standard by height Weight (kg) x 100 (%) Overweight +20-30% Obesity >30%

Children, 2022

Survey type:Measured
Age:6-14
Sample size:337
Area covered:National
Список литературы:Ministry of Health, Labor and Welfare. The National Health and Nutrition Survey (NHNS) Japan, 2022
Notes:English summary currently unavailable. NB: VERY SMALL SAMPLE SIZE
Definitions:Determination of obesity by school health statistics survey method. The degree of obesity in 6 to 14 years old was determined from the standard weight by age and height. Degree of obesity (overweight) = (measured weight (kg) - standard weight by height (kg)) / standard by height Weight (kg) x 100 (%) Overweight +20-30% Obesity >30%

Children, 2019

Survey type:Measured
Age:6-14
Sample size:393
Area covered:National
Список литературы:Japan National Health and Nutrition 2019 Survey. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001148507&tclass2val=0 ('last accessed 27.09.22)
Notes:NB VERY SMALL SAMPLE SIZE
Definitions:Determination of obesity by school health statistics survey method. The degree of obesity in 6 to 14 years old was determined from the standard weight by age and height. Degree of obesity (overweight) = (measured weight (kg) - standard weight by height (kg)) / standard by height Weight (kg) x 100 (%) Overweight +20-30% Obesity >30%
Cutoffs:Other

Children, 2012

Survey type:Measured
Age:6-14
Sample size:2192
Area covered:National
Список литературы:Japan National Health and Nutrition 2012 Survey. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001148507&tclass2val=0 ('last accessed 18.09.23)
Definitions:Determination of obesity by school health statistics survey method. The degree of obesity in 6 to 14 years old was determined from the standard weight by age and height. Degree of obesity (overweight) = (measured weight (kg) - standard weight by height (kg)) / standard by height Weight (kg) x 100 (%) Overweight +20-30% Obesity >30%
Cutoffs:Other

Children, 2010

Survey type:Measured
Age:6-14
Sample size:655
Area covered:National
Список литературы:Japan National Health and Nutrition 2010 Survey. Excel results available at https://www.e-stat.go.jp/stat-search/files?page=1&layout=datalist&toukei=00450171&tstat=000001041744&cycle=7&tclass1=000001148507&tclass2val=0 ('last accessed 18.09.23)
Notes:NB. Small sample size
Definitions:Determination of obesity by school health statistics survey method. The degree of obesity in 6 to 14 years old was determined from the standard weight by age and height. Degree of obesity (overweight) = (measured weight (kg) - standard weight by height (kg)) / standard by height Weight (kg) x 100 (%) Overweight +20-30% Obesity >30%
Cutoffs:Other

Children, 2004-2007

Survey type:Measured
Age:9-10
Sample size:1436
Area covered:Regional - Ina
Список литературы:Ochiai, Hirotaka, et al. “Changes in Overweight/Obesity and Central Obesity Status from Preadolescence to Adolescence: A Longitudinal Study among Schoolchildren in Japan.” BMC Public Health, vol. 20, no. 1, 17 Feb. 2020, 10.1186/s12889-020-8343-3. Accessed 11.10.21.
Cutoffs:IOTF

Children, 1996-2000

Survey type:Measured
Age:6-8
Sample size:56604
Area covered:National
Список литературы:Matsushita Y, Yoshiike N, Kaneda F, Yoshita K, Takimoto H. Trends in Childhood obesity in Japan over the last 25 years from the National Nutrition Survey. Obesity Research 2004;12(2):205-214
Notes:56604 = total number included for the duration of the study
Cutoffs:IOTF

Children, 1986-1990

Survey type:Measured
Age:6-8
Sample size:56604
Area covered:National
Список литературы:Matsushita Y, Yoshiike N, Kaneda F, Yoshita K, Takimoto H. Trends in Childhood obesity in Japan over the last 25 years from the National Nutrition Survey. Obesity Research 2004;12(2):205-214
Notes:56604 = total number included for the duration of the study
Cutoffs:IOTF

Children, 1976-1980

Survey type:Measured
Age:6-8
Sample size:56604
Area covered:National
Список литературы:Matsushita Y, Yoshiike N, Kaneda F, Yoshita K, Takimoto H. Trends in Childhood obesity in Japan over the last 25 years from the National Nutrition Survey. Obesity Research 2004;12(2):205-214
Notes:56604 = total number included for the duration of the study
Cutoffs:IOTF

0-5 years, 2010

Age:0-5
Sample size:6643
Список литературы:Other: Japan 2010 Growth Survey of Infants and Children
Notes:UNICEF/WHO/World Bank Joint Child Malnutrition Estimates Expanded Database: Overweight (Survey Estimates), May 2023, New York. For more information about the methodology, please consult https://data.unicef.org/resources/jme-2023-country-consultations/ Percentage of children under 5 years of age falling above 2 standard deviations (moderate and severe) from the median weight-for-height of the reference population.
Definitions:=>+2SD

0-5 years, 2000

Survey type:Measured
Age:0-5
Sample size:8594
Area covered:National
Список литературы:Japan 2000 Growth Survey of Infants and Children
Notes:UNICEF/WHO/World Bank Joint Child Malnutrition Estimates Expanded Database: Overweight estimates: National and Disaggregated, July 2025, New York. Weighted sample size. For more information, please consult https://data.unicef.org/resources/jme/. NB. Excluding Hospital Survey
Definitions:Percentage of children under 5 years of age falling above 2 standard deviations (moderate and severe) from the median weight-for-height of the reference population.
Cutoffs:=>+2SD

0-5 years, 1990

Survey type:Measured
Age:0-5
Sample size:10797
Area covered:National
Список литературы:Japan 1990 Growth Survey of Infants and Children
Notes:UNICEF/WHO/World Bank Joint Child Malnutrition Estimates Expanded Database: Overweight estimates: National and Disaggregated, July 2025, New York. Weighted sample size. For more information, please consult https://data.unicef.org/resources/jme/. NB. Excluding Hospital Survey
Definitions:Percentage of children under 5 years of age falling above 2 standard deviations (moderate and severe) from the median weight-for-height of the reference population.
Cutoffs:=>+2SD

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