A Daily Cuppa May Help Your Vessels, but Let It Cool First

A Daily Cuppa May Help Your Vessels, but Let It Cool First

Nearly 486,000 adults tracked for nine years

People who drank tea regularly had about an 11% lower relative risk of vascular disease than those who drank it less often, according to a study published on October 21, 2026, in the Journal of Internal Medicine. The team drew on 485,934 adults aged 30 to 79 from the China Kadoorie Biobank, followed for a median of 9.05 years. During follow-up, researchers recorded 14,863 cases of vascular disease spanning cardiovascular disease, cerebrovascular disease, pulmonary heart disease and peripheral artery disease. Regular drinking meant tea on at least three days a week.

A major cohort study, not a drinking prescription

The paper, on habitual tea consumption and cardiovascular risk, used multivariable Cox models to estimate hazard ratios across total vascular disease and 12 subtypes. Dell Stanford, a senior dietitian at the British Heart Foundation who was not involved in the work, said the findings add to evidence linking tea with better cardiovascular health, while stressing they do not prove a daily cuppa protects the heart. No guideline body has turned the results into a recommended number of cups.

Black tea looks steadier than green, moderate strength wins

Black tea showed stronger and more consistent inverse associations across vascular disease types than green tea, with moderate-strength brews linked to lower risk. Researchers point to fermentation-derived compounds such as theaflavins, alongside naturally occurring polyphenols and flavonoids, which have antioxidant and anti-inflammatory properties. These compounds may help the cells lining blood vessels and improve arteries' ability to relax, easing blood pressure and strain on the heart.

Six to eight cups marks the low point, scalding reverses it

Among weekly drinkers, the lowest estimated risk sat at roughly six to eight cups per day, with risk climbing again at very high intakes. Weekly drinkers averaged 2.78 cups a day. Temperature was the surprise modifier: people reporting burning hot tea had about a 16% higher risk than non-regular drinkers, while those drinking room-temperature or hot-but-not-scalding tea had significantly lower risk.

Tea plus no smoking plus activity cuts risk by 45 percent

The biggest gap appeared in combination. Compared with current smokers with low activity who drank no tea, people with all three favorable habits, regular tea, no current smoking and high physical activity, had about a 45% lower rate of vascular disease. The authors cautioned this compares groups, so no individual is guaranteed that cut, and estimated that roughly 30% of new vascular cases could potentially be avoided if everyone held all three habits. The analysis adjusted for age, sex, region, education, weight, smoking, alcohol, exercise and medical history.

Observational by design, so treat the headline with care

Coverage across outlets flags the same caveats: tea intake was measured only once, cup sizes were not standardized, and temperature and amount were self-reported and subjective. The observational design cannot establish causation. Stanford advised against treating six to eight cups as a target. The practical takeaway is modest: keep drinking tea you enjoy, favor moderate strength, give the cup a few minutes to cool, and pair it with not smoking and staying active.