Drinking two or more cups of coffee per day can double the risk of death from cardiovascular disease in people with very high blood pressure (160/100 mm Hg or higher), but not the same amount of risk for people with heart disease. Traditionally high blood pressure measures, according to research published in News Medical & Life Science citing the Journal of the American Heart Association.
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Just one cup.. advantages and disadvantages
In contrast, the study found that drinking one cup of coffee and consuming green tea per day did not increase the risk of death related to cardiovascular disease at any measure of blood pressure, even though both drinks contained caffeine. According to the FDA, a cup of green or black tea contains 30-50 milligrams of caffeine, while a cup of coffee contains approximately 80-100 milligrams.
Previous research has revealed that drinking one cup of coffee per day may help heart attack survivors by reducing the risk of death after a heart attack and may prevent heart attacks or strokes in healthy individuals. Separate studies have also suggested that drinking coffee regularly can reduce the risk of chronic diseases, such as type 2 diabetes. It also helps control appetite, along with reducing the risk of depression or increasing alertness. Although it is not clear whether this effect is due to the caffeine or something else in the coffee. But on the harmful side, excessive coffee consumption leads to high blood pressure, increased stress and anxiety, heart palpitations and difficulty sleeping.
blood pressure
High blood pressure occurs when the force of blood pushing against the walls of blood vessels is constantly too high, causing the heart to work harder to pump blood. It is measured in millimeters of mercury. Current blood pressure guidelines from the American Heart Association and the American College of Cardiology classify hypertension as a blood pressure reading of 130/80 mm Hg or higher.
But the blood pressure criteria for this study differed slightly from the ACC/AHA guidelines, as the researchers classified blood pressure into five categories: optimal, normal (less than 130/85 mmHg), normal (130-139/85-89 mmHg), and hypertensive. Grade I (140-159/90-99 mmHg), Grade II (160-179/100-109 mmHg), and Grade III (above 180/110 mmHg).
Blood pressure measurements in grades II and III were considered severe hypertension in this study. Over nearly 19 years of follow-up (up to 2009), 842 deaths related to cardiovascular disease were documented.
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Important results
The researchers revealed that an analysis of the data for all participants demonstrated the following:
• The association of drinking two or more cups of coffee per day with a double risk of death from cardiovascular disease in people whose blood pressure was 100/160 mm Hg or higher compared to those who did not drink any coffee.
• Drinking one cup of coffee per day was not associated with an increased risk of death from cardiovascular disease across any blood pressure category.
• Green tea consumption was not associated with an increased risk of cardiovascular disease in any blood pressure category.
Avoid excessive
“The results of the study may support the assertion that people with elevated Severe blood pressure, they should avoid drinking coffee a lot.
And since people with very high blood pressure are more susceptible to the effects of caffeine, the harmful effects of caffeine can outweigh its protective effects and possibly increase the risk of death.”
Benefits of green tea
The study found that people who consumed coffee frequently were more likely to be younger, current smokers, eat fewer vegetables, have higher total cholesterol levels and lower systolic blood pressure (the top number) regardless of blood pressure category.
The benefits of green tea can be explained by the presence of polyphenols, micronutrients with healthy antioxidant and anti-inflammatory properties found in the plants. The researchers noted that polyphenols could be part of the reason why only coffee consumption is associated with an increased risk of death in people with severe high blood pressure even though both green tea and coffee contain caffeine.