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Apart from water, tea is the most widely consumed drink worldwide. Tea contains caffeine, which can be harmful in large quantities, so people are advised to limit their intake of tea and other caffeine-containing drinks, such as coffee. However, tea is also high in antioxidants, associated with a reduced risk of cardiovascular disease and cancer.

The study sample comprised 498,043 men and women ages 40 to 69. All participants received physical examinations and provided blood, urine, and saliva samples when they enrolled in the study from 2006 to 2010. They then completed a baseline questionnaire about their tea drinking habits. Participants recorded how many cups of tea—on average—they drank each

During follow-up, 29,783 people died. Researchers found that the risk of all-cause mortality decreased by around 12% as tea intake increased to three cups per day. People who drank more than three cups of tea a day did not have a lower mortality risk than those who drank between one and three cups. Adding milk

Tea is high in polyphenols, which are antioxidants found in many plant products. Green tea contains more polyphenols than black tea. Research suggests that a diet high in polyphenols may protect against many health conditions, including high blood pressure, some cancers, cardiovascular disease, and type 2 diabetes. “Tea is very rich in bioactive compounds like

Dr. Inoue-Choi said that black tea, “even at higher levels of intake, can be part of a healthy diet.” However, the current study found no further health benefits after the third daily cuppa. And tea contains caffeine, which can have adverse effects at high consumption levels. Small amounts of caffeine have been shown to enhance

The researchers acknowledge that some variables were not controlled for in their study, including the strength of the tea, steeping time, or serving size. They also cannot prove that black tea was responsible for reduced mortality. Dr. Inoue-Choi explained: “This study showed an association […] but our findings need to be replicated in other studies