Which tea has the most benefits

Enjoyable drink with additional benefits

In addition to caffeine and polyphenol compounds, amino acids, vitamins (A, B1, B2, C, D), enzymes, pigments (chlorophyll), carbohydrates, minerals such as calcium, magnesium, iron and fluorine and organic fats have been identified as components of tea leaves.

Tea and cardiovascular system

Epidemiological studies have linked black tea consumption to a reduced risk of cardiovascular disease (6). However, the results of intervention studies are contradictory. A randomized study in older adults with known previous cardiovascular diseases found no significant influence (7), while other authors described a direct cardioprotective effect on endothelial function in humans from drinking black tea (8).

A meta-analysis from 2014 in which eleven randomized controlled studies with a total of 378 test persons were evaluated gives an overview of the study situation on the effects of black tea on blood pressure. Analysis of the pooled data showed that daily consumption of black tea for one week and longer is associated with a statistically significant reduction in systolic and diastolic blood pressure of 2 and 1 mmHg, respectively (9). Although this effect was very modest, it may be important due to the widespread consumption of black tea and the high prevalence of high blood pressure and the associated risk of cardiovascular disease.

In fact, a very large meta-analysis showed that a 2 mmHg lower blood pressure is associated with a 10 percent lower stroke mortality and a 7 percent lower mortality from ischemic heart disease or other vascular causes in middle-aged people (10). The effect of the flavonoids on endothelial function could at least partially explain the blood pressure lowering effect (11).

Similar results were also found with green tea. Observational studies have shown that one cup a day reduces the risk of developing coronary artery disease by 10 percent (12). A meta-analysis confirmed that the consumption of green tea significantly reduced blood pressure in patients with hypertension or prehypertension (120 to 139 mmHg / 80 to 89 mmHg) (13). In line with the clinical studies, in vivo studies confirmed that green tea extract significantly reduced the experimentally induced rise in blood pressure in animals and improved endothelial function in hypertensive rats (14, 15).