According to James J. E. , caffeine, through its daily consumption from a variety of sources (coffee, teas, soft drinks, chocolate and medicines), may have an impact on cardiovascular risk. This fact is related to the evidence found the scientific literature about the ability of caffeine to increase resting blood pressure (BP) in adults by about 4/2 mmHg. However, this increase in BP could be responsible for premature deaths of about 14% for coronary heart disease and 20% for stroke. (47)
Tea consumption, stroke, and cardiovascular disease:
Authors analyzed fourteen studies (with a total of 513,804 participants) written from January 1966 to March 2012 to examine the relationship between green and black tea consumption and risk of stroke in a meta-analysis. They found that as tea consumption increased the risk of stroke decreased. Increasing tea consumption by 3 cups a day was associated with a 13% decrease in risk of stroke (RR=0.87). Additionally, results from three papers indicated that as tea drinking increased, this did not necessarily reduce the risk of strokes due to bleeding (cerebral hemorrhage and subarachnoid hemorrhagic strokes). (48)