"Energy drinks," which usually contain caffeine and other additives, may be harmful to people with heart problems, according to a study presented at the American Heart Association's 2007 annual meeting. In 15 healthy adults who drank two cans a day of a popular energy drink, systolic blood pressure (the upper number) rose by as much as 9.6 percent, and diastolic blood pressure (the bottom number) increased by as much as 7.8 percent.
Heart rates increased five to seven beats per minute after consuming the drinks. Although the increases did not reach dangerous levels, the cardiac changes could be problematic for people with existing hypertension or heart disease. The researchers advise people with high blood pressure or heart disease to avoid energy drinks.
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