Coffee and High Blood Pressure
Studies have shown that caffeine raises blood pressure only for a short period of time. Most people with hypertension should be able to continue to drink coffee, and high blood pressure should not be aggravated by this. Some doctors recommend only two cups of coffee a day or two to four cans of soda for people with high blood pressure.
Hypertension research studies have shown that the caffeine in coffee, as well as in other drinks such as tea and sodas, raises blood pressure only temporarily. Once the caffeine is out of the body, the blood pressure returns to its "normal" level. Studies have also shown that in people who drink coffee on a regular basis, blood pressure does not increase as much as in someone who does not drink coffee regularly.
Therefore, for a person with normal blood pressure, drinking coffee will not increase the risk of developing high blood pressure (also called hypertension). People with high blood pressure should be able to continue to have drinks that contain caffeine. However, they should talk to their doctor about coffee and high blood pressure.
For some, especially those who are sensitive to coffee or have heart disease, their doctors may recommend that they limit caffeine consumption. Some healthcare providers recommend only two cups of coffee a day or two to four cans of soda for those people with high blood pressure.
A study published in the Journal of the American Medical Association (JAMA) in November 2005 further clarified that coffee does not increase the risk of developing high blood pressure. Interestingly, however, this study showed that sugar and diet colas did increase the chances of developing hypertension. These study results need to be further clarified.