Abstract
Survivors of natural disasters are at a high risk of cardiovascular disease. Behavioral risk factors, including modifiable diet, need to be identified. Thus far, the association between dairy intake and new-onset hypertension among these survivors is unknown. Therefore, we investigated this relationship. We conducted a longitudinal cohort study of 4475 survivors of the Great East Japan Earthquake in 2011 who participated in a 7-year follow-up survey. New-onset hypertension was assessed using annual health checkup data. Information on the frequency of dairy intake was obtained using a self-report questionnaire. The hazard ratio for developing hypertension according to the frequency of dairy intake was calculated using Cox proportional hazards regression models. The total number of person-years observed was 20,042, with a median follow-up of 5.4 years. During the observation period, 1554 individuals developed hypertension. The multivariable-adjusted hazard ratios of new-onset hypertension were significantly lower in those who consumed dairy products once per day (0.82, 95% confidence interval 0.71ā0.94) and twice or more times per day (0.84, 95% confidence interval 0.71ā0.99) than in nonconsumers; the inverse linear trend was marginally significant (Pā=ā0.083). This association was not affected by lipid metabolism and was consistent across subgroups by sex, age, behavioral factors, cardiometabolic factors, and housing type due to the disaster. A higher frequency of dairy intake was associated with a lower risk of new-onset hypertension in community-dwelling survivors of earthquakes and tsunamis. Dietary guidance involving dairy intake could reduce the risk of developing hypertension among these survivors.
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Funding
This study was supported by grants from the Ministry of Health, Labor and Welfare, Health and Labor Sciences Research Grants, Japan (H23-Tokubetsu-Shitei-002; H24-Kenki-Shitei-001, H25-Kenki-Shitei-001(Fukkou)), JSPS KAKENHI (18K10108), the Dairy Products Health Science Council and the Japan Dairy Association. None of the study sponsors had any role in the study design, conduct of the study, data collection, data interpretation, or preparation of the paper.
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Miyagawa, N., Tsubota-Utsugi, M., Tsuboyama-Kasaoka, N. et al. Seven-year incidence of new-onset hypertension by frequency of dairy intake among survivors of the Great East Japan Earthquake. Hypertens Res 45, 1459ā1467 (2022). https://doi.org/10.1038/s41440-022-00933-0
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DOI: https://doi.org/10.1038/s41440-022-00933-0
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