The experts report that drinking green tea or coffee can reduce multiple causes of death and prevent further cardiovascular events, while daily coffee consumption can also lower the risk of heart attacks or strokes in healthy individuals.
Previous studies have focused on the heart health benefits of green tea and coffee in people without a history of cardiovascular disease. For the current investigation, researchers set out to examine the effects of green tea and coffee consumption among heart attack and stroke survivors.
“There is a strong need for scientific evidence on the lifestyles among survivors of stroke and heart attack considering the rapidly aging population and the need to improve life expectancy following these cardiovascular events,” said study co-author Dr. Hiroyasu Iso.
The experts analyzed data on more than 46,000 participants from the Japan Collaborative Cohort Study for Evaluation of Cancer Risk (JACC study), which was conducted in 45 communities across Japan. The individuals had shared information on their lifestyle, medical history, and diet.
The participants were divided into three groups: history of stroke, history of myocardial infarction (MI), and no history of stroke or MI. Next, the researchers analyzed the amount and frequency of green tea and coffee consumption.
According to the researchers, a typical cup of green tea contains about 3.4 ounces of liquid, while a typical cup of coffee contains about 5 ounces of liquid.
The study revealed that stroke survivors who consumed at least seven cups of green tea daily lowered their risk of all-cause mortality by approximately 62 percent compared to individuals who rarely drank green tea.
Heart attack survivors who drank one cup of coffee per day reduced their overall risk of death by approximately 22 percent. In addition, people with no history of heart attack or stroke who consumed one or more cups of coffee per week had a 14 percent lower risk of all-cause mortality compared to those who did not drink coffee.
The findings indicate that green tea consumption prevents further cardiovascular events, while coffee can prevent such events in healthy individuals.
“An important distinction to make is that in Japanese culture, green tea is generally prepared with water and without sugar. Additionally, coffee is prepared with water and occasionally milk and sugar,” said Dr. Iso. “The healthiest way to prepare these beverages is without an unnecessary amount of added sugars.”
The study is published in Stroke: Journal of the American Heart Association.