Abstract
Objective
Although masticatory performance is affected by age-related reduction in number of teeth (or treatment), the relationship between longitudinal changes in masticatory performance and diabetes mellitus is unknown. This longitudinal study investigated the association between changes in masticatory performance and new-onset diabetes mellitus among community-dwelling Japanese older adults.
Methods
The data of 214 older adults living in Ohnan Town, Shimane, Japan, who participated in two surveys conducted between 2012 and 2017 were analyzed. Diabetes mellitus was defined as a hemoglobin A1c level ≥ 6.5% or self-reported diabetes mellitus. The masticatory performance (measured by number of gummy jelly pieces collected after chewing) was evaluated by dental hygienists. Masticatory performance was categorized into two groups (high or low) based on the median in each survey; further, four groups (Group A: remained consistently high, Group B: changed from low to high, Group C: remained consistently low, Group D: changed from high to low) were used to determine longitudinal changes in masticatory performance. Logistic regression was used to analyze the association between changes in masticatory performance and new-onset diabetes mellitus.
Results
Overall, 10.3% of participants had diabetes mellitus at the follow-up survey. Multivariate analysis showed that Group D (odds ratio 8.69, 95% confidence interval 1.98–38.22) was positively associated with the development of diabetes mellitus compared with Group A after adjusting for sex, age, body mass index, alcohol consumption, physical activity, and eating speed.
Conclusions
Deteriorating masticatory performance for 5 years may cause diabetes mellitus among older adults.
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Data availability statement
Data are available upon reasonable request. This study used data from the Shimane CoHRE (Center for Community-Based Healthcare Research and Education) study. Some of the data are available from the CoHRE, Organization for Research and Academic Information, Shimane University, 223–8 Enya-cho, Izumo-shi, Shimane 693–8501, Japan.
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Acknowledgements
We greatly appreciate the cooperation from participants in Ohnan Town and thank the Shimane CoHRE study members for their skillful assistance.
Funding
This study was supported by the Japan Society for the Promotion of Science (KAKENHI; Grant number 16K13029). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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MI and TN organized and conducted the study. TA. and TH. collected data. KT, TA, and SY performed the statistical analysis, interpreted the results, proposed the structure of the paper, and formulated the paper. YA and TH made substantial contributions to the data analysis and draft revision. MI and TN critically appraised the paper and made final suggestions. All the authors reviewed and revised the manuscript and agreed to the submission of the final manuscript.
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Kazumichi Tominaga, Takafumi Abe, Yuichi Ando, Tsuyoshi Hamano, Minoru Isomura, Toru Nabika, and Shozo Yano declare that they have no conflicts of interest.
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All the procedures followed were in accordance with the ethical standards of the Medical Research Ethics Committee, Shimane University Faculty of Medicine (May 11, 2017/#20051214-3) and with the Helsinki Declaration of 1964 and later versions.
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Residents provided consent via signature to participate in the study after receiving written and oral explanations of the study.
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Tominaga, K., Abe, T., Ando, Y. et al. Changes in masticatory performance and the new onset of diabetes mellitus in older adults: a 5-year longitudinal study. Diabetol Int 14, 165–171 (2023). https://doi.org/10.1007/s13340-022-00613-x
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DOI: https://doi.org/10.1007/s13340-022-00613-x