While it is still not clear how caffeine can contribute to hypertension, a 4-week study had suggested that people who are at risk of developing hypertension may want to reconsider before taking another cup of coffee.
During the study, healthy adult volunteers, who had their blood pressures measured to monitor their responses to caffeine intake, had minor change in blood pressure as a result of their morning coffee. However, a greater effect on blood pressure was found for people who had a family history of hypertension or with borderline blood pressure.
The research, therefore, concluded that people with or at risk of developing hypertension should not consume more than 4 cups of coffee a day.
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