Tea consumption and risk of ischaemic heart disease
Xia Li1, Canqing Yu1, Yu Guo2
1Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Insights
Daily tea consumption is linked to a lower risk of ischaemic heart disease (IHD). This large prospective study in China found that regular tea drinkers had fewer IHD and major coronary events.
Area of Science:
- Cardiovascular Health
- Nutritional Epidemiology
- Preventive Medicine
Background:
- Ischaemic heart disease (IHD) remains a leading cause of mortality globally.
- Understanding modifiable lifestyle factors, such as diet, is crucial for prevention.
- Tea consumption is a widespread dietary habit with potential health benefits.
Purpose of the Study:
- To prospectively investigate the association between habitual tea consumption and the incidence of ischaemic heart disease (IHD).
- To evaluate the relationship between different levels of tea intake and major coronary events (MCEs).
Main Methods:
- A large-scale prospective cohort study utilizing the China Kadoorie Biobank.
- Inclusion of nearly 488,000 participants aged 30-79 years, free of cardiovascular disease and cancer at baseline.
- Longitudinal follow-up for up to 10 years, with IHD and MCE data collected from disease registries and national health insurance databases.
Main Results:
- Daily tea consumption was associated with a reduced risk of IHD (HR 0.92, 95% CI 0.88-0.95) and MCE (HR 0.90, 95% CI 0.82-0.99) compared to non-consumers.
- The protective association was more pronounced in rural populations and in individuals without obesity or diabetes.
- No significant linear trend was observed across varying amounts of daily tea consumption.
Conclusions:
- Daily tea consumption is associated with a significantly lower risk of developing ischaemic heart disease.
- Findings suggest tea may play a role in cardiovascular disease prevention, particularly in specific subpopulations.
- Further research could explore mechanisms underlying tea's cardioprotective effects.
Objective:
To prospectively examine the association between tea consumption and the risk of ischaemic heart disease (IHD).
Methods:
Prospective study using the China Kadoorie Biobank; participants from 10 areas across China were enrolled during 2004-2008 and followed up until 31 December 2013. After excluding participants with cancer, heart disease and stroke at baseline, the present study included 199 293 men and 288 082 women aged 30-79 years at baseline. Information on IHD incidence was collected through disease registries and the new national health insurance databases.
Results:
During a median follow-up of 7.2 years, we documented 24 665 (7.19 cases/1000 person-years) incident IHD cases and 3959 (1.13 cases/1000 person-years) major coronary events (MCEs). Tea consumption was associated with reduced risk of IHD and MCE. In the whole cohort, compared with participants who never consumed tea during the past 12 months, the multivariable-adjusted HRs and 95% CIs for less than daily and daily tea consumers were 0.97 (0.94 to 1.00) and 0.92 (0.88 to 0.95) for IHD, 0.92 (0.85 to 1.00) and 0.90 (0.82 to 0.99) for MCE. No linear trends in the HRs across the amount of tea were observed in daily consumers for IHD and MCE (PLinear >0.05). The inverse association between tea consumption and IHD was stronger in rural (PInteraction 0.006 for IHD, <0.001 for MCE), non-obese (PInteraction 0.012 for MCE) and non-diabetes participants (PInteraction 0.004 for IHD).
Conclusions:
In this large prospective study, daily tea consumption was associated with a reduced risk of IHD.
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