A new study suggests that drinking tea may help reduce the risk of heart attack, stroke, and cardiovascular death in people who already have coronary heart disease (CHD). CHD is the most common type of heart disease in the United States, affecting about 1 in 20 adults.
Researchers analyzed data from more than 25,000 adults with established CHD who were part of the UK Biobank. The study followed participants for an average of nearly 14 years. During that time, researchers tracked major adverse cardiovascular events, including heart attacks and strokes.
The study also looked at levels of C-reactive protein (CRP), a marker of inflammation, and Lp(a), a genetic risk factor for heart problems. Researchers wanted to see if these factors changed the link between tea drinking and heart health outcomes.
The results showed that drinking about three cups of tea per day, compared to drinking no tea, was linked to a 17 percent lower risk of heart attack, stroke, or death from cardiovascular causes. Drinking four or more cups daily still showed a benefit, but it did not offer more protection than the three-cup amount.
The strongest protective effects were seen in people who had higher levels of inflammation at the start of the study. Tea is known for its anti-inflammatory properties, and inflammation is a known driver of heart-related complications. People with lower Lp(a) levels also saw stronger benefits.
Researchers did not find evidence that Lp(a) itself explained why tea was helpful. Instead, the findings suggest that inflammation may play a key role in determining who benefits most from drinking tea.
Tea contains polyphenols and other plant compounds that may help support healthy blood vessels, improve blood vessel function, and reduce oxidative stress. These factors are all involved in the progression of heart disease.
The study did not separate tea by type, so it is not possible to say whether one variety is better than another. However, green tea has strong research backing for heart health. It is rich in catechins, particularly epigallocatechin gallate (EGCG), which has been linked to healthy cholesterol levels and better blood vessel function. Black, oolong, and herbal teas also contain beneficial compounds.
For people who do not drink tea, a growing body of research suggests that moderate coffee consumption, also about three cups per day or 24 ounces, supports heart health.
People with coronary heart disease should talk to their doctor before making changes to their diet or lifestyle. Caffeinated teas, such as green, black, and oolong, should be consumed earlier in the day to avoid disrupting sleep. Herbal teas are a good option for afternoons and evenings.
