The relationship between coffee and tea, and risk of hypertension remains controversial in Western populations. We investigated these associations in an Asian population.
The Singapore Chinese Health Study is a population-based prospective cohort that recruited 63,257 Chinese aged 45–74 years and residing in Singapore from 1993 to 1998. Information on consumption of coffee, tea, and other lifestyle factors was collected at baseline, and self-reported physician-diagnosed hypertension was assessed during two follow-up interviews (1999–2004, 2006–2010).
We identified 13,658 cases of incident hypertension after average 9.5 years. Compared to those who drank one cup of coffee/day, the hazard ratios (HR) and 95% confidence intervals (CI) were 0.87 (0.83–0.91) for <weekly drinkers and 0.93 (0.86–1.00) for ≥3 cups/day drinkers. Compared to <weekly drinkers, daily drinkers of black or green tea had slight increase in risk, but these risk estimates were attenuated and became non-significant after adjustment for caffeine. After adjusting for coffee, there was a stepwise dose–response relationship between caffeine intake and hypertension risk; compared to the lowest intake (<50 mg/day), those in the highest intake (≥300 mg/day) had a 16% increase in risk; HR 1.16, 95% CI 1.04–1.31 (p trend = 0.02).
Drinking coffee <1 cup/week or ≥3 cups/day had lower risk than drinking one cup/day. Caffeine may account for increased risk in daily tea drinkers and in those who drank one cup of coffee/day. The inverse U-shaped association with coffee suggests that at higher doses, other ingredients in coffee may offset the effect of caffeine and confer benefit on blood pressure.
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This study is supported by the National Institutes of Health, USA (NCI R01 CA144034 and UM1 CA182876). Woon-Puay Koh is supported by the National Medical Research Council, Singapore (NMRC/CSA/0055/2013). We thank Siew-Hong Low of the National University of Singapore for supervising the field work of the Singapore Chinese Health Study and Renwei Wang for the maintenance of the cohort study database. Finally, we acknowledge the founding Principal Investigator of the Singapore Chinese Health Study—Mimi C. Yu.
WPK and JMY designed and conducted the research; WPK and AS analyzed the data; CLC and JKL wrote the paper; CLC, JKL, JMY, and WPK interpreted the statistical analysis and data; WPK had primary responsibility for final content. All authors revised the manuscript for important intellectual content and read and approve the final manuscript.
Conflict of interest
All authors have no conflict of interest to declare.
Choy-Lye Chei and Julian Kenrick Loh have contributed equally to the work.
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Chei, CL., Loh, J.K., Soh, A. et al. Coffee, tea, caffeine, and risk of hypertension: The Singapore Chinese Health Study. Eur J Nutr 57, 1333–1342 (2018). https://doi.org/10.1007/s00394-017-1412-4
- Prospective study