Regular Tea Drinking Linked to Lower Vascular Disease Risk in Large Study

Regular tea drinking was associated with lower vascular disease risk in a study that followed nearly 486,000 adults in China for nine years. The researchers reported an estimated 11% lower risk among regular tea drinkers than among people who didn’t drink tea. The finding adds to research on tea and heart health, but it doesn’t establish that tea itself prevents disease.

The results appeared in the Journal of Internal Medicine. Researchers asked participants about their tea habits and later assessed their cardiovascular health. The conditions considered included heart disease, stroke and peripheral artery disease. Because this was an observational study, the team tracked associations in people’s lives rather than assigning them to drink tea or comparing tea with a controlled alternative.

What the researchers observed

Several details stood out. Black tea was linked more consistently with lower vascular disease risk than green tea, and moderate-strength tea showed the strongest association. The lowest estimated risk appeared among people who drank tea regularly and reported having six to eight cups a day. That finding doesn’t establish a target intake: people who drank less may also have benefited, and the study can’t show that drinking more tea would lower an individual’s risk.

Tea temperature was another factor. Participants who described their tea as “burning hot” had a 16% higher risk of vascular disease, according to the study. That result needs careful interpretation: participants reported how hot their tea was, and researchers didn’t measure its temperature. The finding is an association that needs more research. It also echoes existing concerns about very hot beverages, including possible links with cancer risk, described by the National Center for Biotechnology Information.

The researchers also examined habits that occurred alongside tea drinking. People who drank tea regularly, didn’t smoke and were highly active had about a 45% lower heart disease risk than people who had none of those three characteristics. That comparison points to the role of combined behaviors; it doesn’t tell us how much of the association came from tea or from any single habit.

Possible explanations

Tea contains polyphenols, including flavonoids. Cardiologist Christopher Davis says these plant compounds may support the endothelium, the lining of blood vessels. The endothelium produces nitric oxide, which helps blood vessels relax and supports blood flow. Flavonoids may also help limit inflammation and the oxidation of LDL cholesterol, processes involved in plaque buildup. These mechanisms offer a possible explanation for the observed association, but they don’t prove that tea drinking changed participants’ disease risk.

Black tea undergoes fermentation, which produces polyphenols called theaflavins. Davis says these compounds may help explain why black tea showed a more consistent association in this study. Still, the results don’t establish that black tea is the right choice for everyone. Preventive cardiology dietitian Michelle Routhenstein notes that both black and green tea contain antioxidants, and that people don’t need to drink a particular type to take part in a heart-supportive routine.

There may also be practical reasons that a regular tea habit tracks with health. Cardiologist Arash Bereliani points out that tea can take the place of soda or another sugary drink, and that preparing a cup may become a calming daily ritual. Those possibilities are relevant context, but the study didn’t determine whether either one accounted for the lower risk.

What the findings can and can’t tell us

The size and follow-up period make this a useful study of patterns among a large group, but the design limits its conclusions. People who choose to drink tea may differ from those who don’t in other ways, including diet and activity. Researchers can account for some measured factors, but an observational study can’t rule out every influence or show that tea caused the difference in risk.

The temperature result is particularly uncertain because it relied on participants’ descriptions rather than measurements. The study raises a question about very hot tea, but it doesn’t establish a precise temperature at which risk changes or show that a specific level of warmth is safe or harmful.

For readers who already enjoy tea, the findings are consistent with treating it as one possible part of a broader heart-healthy lifestyle. They don’t support using tea as a substitute for medical care or other steps discussed with a healthcare professional. Routhenstein points to dietary patterns that meet nutritional needs and support healthy cholesterol and blood sugar, regular physical activity, avoiding smoking, adequate sleep and blood pressure management as broader areas that matter for heart health.

People with questions about their own cardiovascular risk, or about how diet fits with their health conditions and treatment, can discuss them with a doctor or dietitian. The clearest takeaway is modest: regular tea drinking was linked with lower vascular disease risk in this large observational study, while the researchers’ findings also highlight how several habits can cluster together. Future research will need to clarify whether tea itself contributes to that association.