Like many Americans, you may have heard so many mixed messages about caffeine and your health that you don’t know if it’s good or bad. Unfortunately, when it comes to caffeine and your heart, the jury is still out. Some studies have shown that consuming coffee or tea regularly is associated with reduced risk of heart attacks and strokes. However, it is unclear if it is the caffeine or some other substance in the coffee or tea that offers the protective effect.
Does caffeine affect your blood pressure? Caffeine increases blood pressure by raising the resistance of blood flowing through your blood vessels. This has been shown in studies of individuals who consumed a one-time dose of 200 to 300 mg of caffeine (or the amount in 1½-3 cups of coffee, 4-6 cups of tea or 4-8 cups of soft drink). What is not clear is how it affects blood pressure over time. Consuming coffee regularly does not seem to have the same effect as a one-time dose. It could be that some people develop a tolerance to caffeine. If you have high blood pressure and you consume caffeine, check with your doctor to see how much caffeine is safe for you.
Caffeine consumption in moderation is acceptable. Most experts recommend no more than 300 mg per day. Overuse of caffeine can lead to irritability, anxiety, sleeplessness, and trouble sleeping. Pregnant women, or women who wish to become pregnant, should consume caffeine only in moderation. Breastfeeding women should avoid caffeine, as it can pass into breast milk.
References
American Dietetic Association. What evidence suggests a relationship between caffeine intake and blood pressure in healthy and hypertensive adults? http://www.adaevidencelibrary.com. Accessed on March 24, 2010.
Ruxton C. Health aspects of caffeine: benefits and risks. Nursing Standard. 2009; 24:41-48.
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