High blood pressure, also called hypertension, is one of the most common health problems worldwide.
It develops when blood pushes against artery walls with too much force over a long period. Because it often causes no obvious symptoms, many people can have high blood pressure without realizing it.
Over time, this extra pressure can damage the heart and blood vessels. It raises the risk of heart attack, stroke, kidney disease and other serious health problems. Researchers are therefore interested in simple everyday habits that might help people keep their blood pressure in a healthier range.
One such habit may be drinking black tea. Researchers at The University of Western Australia found that people who drank three cups of black tea each day had slightly lower blood pressure after six months. The findings were published in the journal Archives of Internal Medicine.
Black tea is made from the leaves of the Camellia sinensis plant, the same plant used to make green and oolong tea. The difference comes mainly from how the leaves are processed after harvesting. Black tea is widely consumed around the world and contains natural plant compounds that have been studied for possible heart benefits.
The researchers studied 95 Australian adults between the ages of 35 and 75. Participants were assigned to drink either three cups of black tea each day or a similar-tasting drink that did not contain tea. The comparison drink contained the same amount of caffeine, helping researchers separate the effects of tea from those of caffeine.
After six months, the black tea group had lower blood pressure than the comparison group. The difference was modest, with both the upper and lower blood pressure readings falling by roughly 2 to 3 millimeters of mercury at different points in the study. Small changes like these may still matter when maintained over time.
A blood pressure reading contains two numbers. The upper number, called systolic pressure, measures the pressure in the arteries when the heart contracts and pumps blood. The lower number, called diastolic pressure, measures pressure while the heart relaxes between beats.
Even a small reduction in blood pressure across a large population could potentially prevent some heart attacks and strokes. This is why researchers pay attention to changes that may look minor for one person. A daily habit that produces a small benefit can become meaningful when millions of people follow it for years.
The scientists believe natural compounds called flavonoids may help explain the effect. These plant compounds are found in tea as well as fruits, vegetables and other foods. Research suggests they may support the inner lining of blood vessels and help arteries respond more effectively when they need to widen.
Healthier, more flexible blood vessels allow blood to flow with less resistance. That could help reduce the pressure needed to move blood around the body. However, the researchers said more work is needed to fully understand which components of black tea are responsible and exactly how they affect blood pressure.
The study does not show that black tea can replace blood pressure medicine or other medical treatment. It also does not mean that drinking more tea will necessarily produce a larger benefit. People who have hypertension should continue following treatment recommended by their health professionals.
Lifestyle remains a major part of blood pressure control. Regular physical activity, eating plenty of nutritious foods, limiting excess salt, maintaining a healthy weight and avoiding smoking can all help protect the heart and blood vessels. For some people, prescription medicines are also necessary to bring blood pressure under control.
Still, black tea has some practical advantages. It is inexpensive, widely available and already part of many people’s daily routines. If its modest effect is confirmed by further research, it could be an easy addition to an overall heart-healthy lifestyle.
The research was led by Professor Jonathan Hodgson and colleagues at The University of Western Australia and published in Archives of Internal Medicine. The results add to evidence that ordinary foods and drinks may have small but useful effects on cardiovascular health when they are part of a healthy lifestyle.
If you care about high blood pressure, please read studies about breakfast for better blood pressure management, and the gut feeling that lowers blood pressure.
For more health information, please see recent studies about how the dash diet helps lower blood pressure, and how to eat your way to healthy blood pressure.
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