Regular tea drinking may be associated with a lower risk of cardiovascular and vascular diseases, according to a large study published in the Journal of Internal Medicine on October 21, 2026. The research adds to growing scientific interest in how everyday beverages may relate to long-term heart and blood vessel health.
The study analyzed data from nearly 486,000 adults in China and found that people who habitually drank tea had a lower risk of developing vascular disease than those who did not regularly drink tea. However, researchers emphasize that the findings show an association, not proof that drinking tea directly prevents disease.
What Did the Study Find?
The research, titled Habitual Tea Consumption Is Associated With Lower Cardiovascular Disease Risk, examined 485,934 participants from the China Kadoorie Biobank.
Participants were followed for an average of approximately nine years. During that period, researchers recorded 14,863 new cases of vascular disease.
The analysis found that habitual tea drinkers had an approximately 11% lower relative risk of developing vascular disease compared with people who did not habitually drink tea.
The study examined several health outcomes, including cardiovascular and cerebrovascular diseases, pulmonary heart disease, and peripheral artery disease.
Researchers also investigated whether the type of tea, its strength, drinking temperature, and other lifestyle habits were associated with differences in risk.
The findings suggest that tea consumption may be one factor linked to vascular health, although other differences between tea drinkers and non-drinkers could also help explain the results.
External source: Journal of Internal Medicine — Original Research
Why Might Tea Be Beneficial for Heart Health?
Tea contains naturally occurring plant compounds called polyphenols, including flavonoids. These compounds have been studied for their potential effects on inflammation, oxidative stress, and blood vessel function.
Some research suggests that tea polyphenols may help support the normal function of blood vessels. Healthy blood vessels are important because they allow blood to circulate efficiently and deliver oxygen throughout the body.
Green and black tea both contain beneficial plant compounds, although their chemical composition differs because they are processed differently.
Black tea undergoes oxidation during production, while green tea is processed to limit oxidation. These differences affect the types and amounts of compounds present in each beverage.
Nevertheless, scientists have not established that the compounds in tea alone explain the lower disease risk observed in population studies. More research is needed to determine which mechanisms may be responsible and how much they matter in everyday life.
Black Tea and Green Tea: Were There Differences?
The 2026 study reported that black tea showed more consistent associations with lower vascular disease risk than green tea.
Researchers also found that moderate-strength tea was associated with lower risk, while drinking tea at extremely high temperatures was associated with higher vascular disease risk.
These results should be interpreted carefully. The study was observational, and researchers examined multiple tea-drinking characteristics and health outcomes. Some findings may require confirmation in other populations and research settings.
The results do not establish that black tea is always healthier than green tea. Both beverages can be part of a balanced diet, and their effects may depend on preparation methods, individual health, and overall lifestyle.
For people who enjoy tea, choosing a temperature that is comfortable to drink rather than consuming it scalding hot is a sensible precaution.
Does Drinking More Tea Provide Greater Protection?
One notable finding was that the lowest estimated risk among weekly tea drinkers appeared at approximately six to eight cups per day in the study’s dose-response analysis.
However, this figure should not be treated as a recommended daily amount.
Tea consumption was assessed through participants’ reported habits, and cup sizes were not standardized. The study also could not prove that increasing tea consumption would reduce an individual’s risk.
Experts commenting on the research cautioned that the results do not justify telling everyone to drink six to eight cups of tea daily.
Tea contains caffeine, although the amount varies according to the type of tea, serving size, and brewing method. Drinking large quantities may cause unwanted effects in some people, including sleep difficulties, restlessness, or a racing heartbeat.
Individual tolerance also varies. People who are sensitive to caffeine may prefer smaller servings or decaffeinated tea.
The most appropriate amount depends on personal tolerance, medical circumstances, and other sources of caffeine in the diet.
Expert commentary: Science Media Centre — Reactions to the 2026 Tea Study
Unsweetened Tea May Be a Better Everyday Choice
How tea is prepared may also matter for overall health.
A separate study published in 2025, using data from more than 177,000 UK Biobank participants, found that unsweetened tea consumption was associated with a lower risk of cardiovascular disease, including coronary artery disease, stroke, and heart failure.
The same study did not find significant protective associations for sugar-sweetened or artificially sweetened tea.
These findings do not prove that sweeteners directly cancel out tea’s potential benefits. However, choosing unsweetened tea can help people avoid unnecessary added sugar, particularly when they drink tea frequently.
Sweetened milk tea, bottled tea, and other tea-based beverages can contain substantial amounts of sugar, depending on the recipe and serving size. Their nutritional effects may therefore differ from those of plain brewed tea.
For people who want to make tea part of a healthy routine, plain green or black tea is a practical option.
External source: International Journal of Cardiology: Cardiovascular Risk and Prevention — Tea and Cardiovascular Disease
Lifestyle Habits Still Matter More
The 2026 research also examined tea consumption alongside smoking and physical activity.
Participants who habitually drank tea, did not smoke, and had high levels of physical activity showed the lowest observed vascular disease risk among the combinations examined.
This finding reinforces an important point: heart health is influenced by multiple factors, rather than a single food or beverage.
Regular physical activity, avoiding tobacco, maintaining a balanced diet, managing blood pressure, and controlling cholesterol can all play important roles in reducing cardiovascular risk.
People should not rely on tea to compensate for smoking, an inactive lifestyle, an unhealthy diet, or untreated medical conditions.
Anyone with high blood pressure, heart disease, or other medical concerns should continue following the advice of their healthcare professional. Tea should not replace prescribed medication or established preventive care.
What Are the Limitations of the Research?
Although the study included a large number of participants and followed them for several years, it has limitations.
First, observational research can identify relationships between habits and health outcomes, but it cannot establish cause and effect. People who regularly drink tea may differ from non-drinkers in their diets, income, physical activity, or other behaviors.
Second, the study was conducted among adults in China. Tea-drinking habits, diets, and other lifestyle factors vary across countries, so the findings may not apply equally to every population.
Third, tea consumption was assessed through reported habits rather than continuous measurement. Drinking patterns may also change over time.
Further research, including studies in different populations, will help scientists better understand the relationship between tea consumption and vascular health.
Conclusion
Regular tea drinking was associated with an approximately 11% lower relative risk of vascular disease in a large Chinese study published in October 2026. The researchers also observed differences related to tea type, strength, temperature, and lifestyle habits.
These findings add to existing evidence suggesting that tea may fit into a heart-healthy lifestyle. However, they do not prove that tea directly prevents strokes or heart disease, and the estimated benefit should not be interpreted as a guarantee for any individual.
For most people who enjoy tea, drinking it at a comfortable temperature and limiting added sugar can be reasonable choices. Ultimately, a balanced diet, regular physical activity, avoiding smoking, and appropriate medical care remain essential components of cardiovascular health.