By Dr. Mercola
Studies have shown that caffeine elevates both blood pressure (BP) and heart rate, which may come as no surprise to coffee drinkers familiar with the lift that the beverage delivers. The investigators found that caffeine raised average blood pressure by about 4 points, and pushed average heart rate up by about 3 beats per minute.
The researchers caution that, if sustained by regular coffee-drinking over a lifetime, these increases in blood pressure and heart rate will elevate the risk of stroke and heart disease. Many other studies, some including tens of thousands of subjects followed over decades, have failed to establish a conclusive link between even heavy coffee consumption and cardiovascular disease. The investigators explained that those epidemiologic studies have not focused specifically on coffee consumption, and often rely on subjective measurements of caffeine intake. >