The key facts
- Regular tea consumption (3+ times a week) is associated with an 11.2% lower risk of vascular disease and a 36.6% lower risk of ischemic stroke.
- Tea that is too hot is associated with a 16% increase in risk; the optimal option is medium-strength tea that doesn't scald.
- The authors and independent experts warn: this is an observational study, and tea does not replace proven preventive measures.
What the study showed
Regular tea consumption is associated with a reduced risk of vascular diseases — stroke, ischemic heart disease, and heart attack. This is the conclusion of a study published in the Journal of Internal Medicine. Scientists followed nearly 500,000 residents of China for an average of nine years, recording tea consumption and the diseases that developed. Among those who drank tea at least three times a week, the overall risk of vascular disease was 11.2% lower. The most pronounced association was found for ischemic stroke — a 36.6% reduction in risk, followed by cerebrovascular disease with a 19.1% reduction.
How tea biochemistry explains the effect
All types of tea — white, green, oolong, black, and pu-erh — are produced from the leaves of a single plant, Camellia sinensis, an evergreen shrub native to East Asia; the flavor depends on the degree of oxidation. Tea's bioactive compounds, including polyphenols and flavonoids, have antioxidant, anti-inflammatory, and endothelium-protective properties, which help maintain the inner lining of blood vessels and healthy circulation.
Variety, amount, and temperature matter
The protective effect varied markedly depending on how tea was prepared and consumed. Median consumption among participants was two to three cups a day, but the lowest risk was seen in those who drank six to eight cups daily. Black tea showed the strongest and most consistent association with vascular disease, followed by green tea; researchers attribute this to fermentation compounds such as theaflavins, which have anti-inflammatory and lipid-normalizing properties. The optimal combination turned out to be medium-strength tea that doesn't scald. Unexpectedly, scalding hot tea was associated with the opposite effect — a 16% increase in the risk of vascular disease. Very hot beverages had previously been linked to a higher risk of esophageal cancer.
Caveats and limitations
The protective association appeared across most demographic subgroups and was noticeably stronger in people with obesity. At the same time, the authors emphasize: tea alone does not protect against cardiovascular disease — it should be part of an overall healthy lifestyle and a complement to proven prevention strategies. Dell Stanford, senior dietitian at the British Heart Foundation, who was not involved in the work, noted: “This was an observational study, and other differences in people's diets and lifestyles could also have influenced the results,” adding that the findings do not prove “that a daily cup of tea protects your heart.”
Context
Cardiovascular diseases remain the leading cause of illness and death in the European Union: they account for one in three deaths and, by estimates, affect 62 million people.
