Caffeine: The Moderate Killer
Dateline: 06/04/98
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New research suggests that moderate caffeine use over a lifetime can contribute significantly to the increased risk of heart disease. Researchers found that the equivalent of 4 to 5 cups of coffee a day elevated blood pressure approximately four to five points within an hour of consumption. The measured pressure also stayed elevated for the majority of the day.
This study was the first to measure the effects of caffeine on subjects during normal conditions. While many have studied the effects of caffeine on blood pressure, effects were usually tested in a controlled environment. Most of these studies compared a high dosage of caffeine to no dosage. While these were helpful in establishing the physical effects of caffeine, the subjects were removed from their normal activities. This study monitored 19 habitual coffee drinkers during their daily routine. Blood pressure readings were taken throughout the day and correlated with self reported stress and mood levels.
Researchers indicated that while a four or five point increase in blood pressure is not necessarily excessive, it can lead to complications over time. Previous studies have indicated that an increase of this magnitude in the diastolic pressure can be associated with up to a 34% increased risk of a stroke and a 22% increased risk of heart disease.
Meanwhile, corollary studies have indicted that a four to five point reduction in blood pressure has a positive effect on mortality statistics.
This study indicates that lifelong consumption of caffeine, even in people who don't currently have high blood pressure, can have a significant impact on heart disease and stroke over time.
What do you think? How important are the cumulative effects of any substance taken over time? Are there ways to reduce this lifelong risk? Does the public pay attention to these dire but distant warnings? Come over to the Biology Forum and share your thoughts, opinions, and feelings. 'Til next time...
For additional information see:
- Moderate Caffeine Use Boosts Blood Pressure, Potential For Heart Disease
Press release from Science Daily.
