BMI trajectory of 8,155,894 Japanese adults from exhaustive health checkup data: the contributions of age-related changes in height and weight
Authors' conclusion
In conclusion, BMI tended to increase with age in both sexes across all age groups of Japanese adults. The increase in BMI appeared to be influenced by weight gain in young to middle age, whereas height reduction influenced increased BMI in older age groups.
Study context
- Population
- Japanese adults aged 35–69 years with annual health checkups by the Japan Health Insurance Association, 2015–2020; stratified into 14 subgroups by sex and 5-year age category14 sex/age subgroups
- Participants
- 4,777,891 vs 3,378,003
- Exposure
- Men vs Women
- Menn = 4,777,891
- Womenn = 3,378,003
- Outcome
- BMI trajectory alongside age-related changes in height and weight
- Follow-up
- 2015-2020
Methodological detailslinear mixed-effects model, annual health checkups 2015–2020
- Linear mixed-effects model
- Annual health checkups 2015–2020
Main finding
As reported in the abstract
Mean BMI change
Men
0.02 to 0.14
mean · kg/m²/year
Women
0.05 to 0.16
mean · kg/m²/year
Observational data: associations, not effects.
Further findings
| Outcome | Men | Women |
|---|---|---|
| Mean change (weight), oldest subgroupskg/year | −0.06 | −0.01 |
| Height changeRange across age subgroups | −0.14 to −0.03 cm/year | −0.18 to −0.01 cm/year |
Weight change
- Larger changes in younger subgroups, weight transitions mirroring BMI
Height change
- Height reduction increased with age across subgroups
Original publication
BMI trajectory of 8,155,894 Japanese adults from exhaustive health checkup data: the contributions of age-related changes in height and weight. Int J Obes (Lond). Published 18 December 2024. doi:10.
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