Regular Tea Drinkers Had 11 Percent Lower Vascular Disease Risk in a Study of 486,000 Chinese Adults

Cup size in this cohort is a Chinese tea cup, considerably smaller than a British mug, and the study did not test whether polyphenols or anything else explain the black versus green difference.

Why does the temperature of the tea matter?

The one clearly negative finding concerned heat. Participants who described their tea as burning hot had a 16 percent higher risk of vascular disease, with a hazard ratio of 1.160 and a confidence interval of 1.090 to 1.236. Very hot drinks have previously been linked to oesophageal cancer; this is an association with blood vessels, and the paper does not identify a mechanism or a specific temperature threshold. Letting the cup cool is the obvious, low-cost response.

Tea, smoking and exercise together

The most striking number came from a joint analysis. People who drank tea habitually, did not currently smoke and were highly physically active had a hazard ratio of 0.548 for vascular disease, about 45 percent lower than those with none of the three, as Medical Xpress summarised. The authors describe the interaction between tea and physical activity as sub-additive, meaning the benefits overlap rather than simply stack.

This is an observational cohort, so it shows association, not cause. Tea drinkers in China differ from non-drinkers in income, diet, region and much else, and while the Cox models adjusted for many factors, residual confounding cannot be excluded. The result sits alongside earlier biobank work rather than overturning it.

This article reports on a published study and is not medical or dietary advice. Anyone with heart disease, high blood pressure or a condition affected by caffeine should discuss their intake with a clinician who knows their history.

What the study adds is detail: not just whether people drink tea, but which tea, how strong, how hot and alongside what habits. The next step the authors suggest is treating those dimensions together in future vascular research rather than counting cups alone.