Research has shown that consuming two to four cups of coffee (200-300 mg of caffeine) can cause an average increase of 8.1 mmHg in systolic blood pressure and 5.7 mmHg in diastolic blood pressure. These changes are temporary and will return to normal within three to four hours. Studies have also revealed that coffee can raise blood pressure up to three hours after consumption, but this effect is reduced if it is consumed regularly. Despite this, experts are still investigating the effects of caffeine on the heart.
According to Dr. Charalambos Vlachopoulos from the cardiology department of the Athens Medical Faculty in Greece, caffeine can rapidly increase stiffness of large arteries in people with high blood pressure. This suggests that the physiological effects of drinking coffee may be more than just a short-term energy boost. Studies have found that consuming between 200 and 300 milligrams of caffeine can increase systolic blood pressure by 8 mm Hg and diastolic blood pressure by 6 mm Hg. However, this effect is reduced in people who are used to drinking large amounts of coffee.
Additionally, the amount of caffeine in coffee, energy drinks, and other beverages varies depending on the brand and method of preparation. It is also important to note that people who consume coffee often consume other things such as cream, sugar, or other foods which can dilute the effect of caffeine on blood pressure. To consume coffee in a healthy way, it is recommended to never drink it on an empty stomach and to have at least one small meal before drinking it in the morning.