According to a Japanese study involving over 18,600 men and women, drinking more than two cups of coffee per day may increase the person’s risk of death if the person has severe hypertension or a related medical history. The results of the study showed that drinking one cup of coffee or one cup of green tea does not increase the risk of cardiovascular disease associated with high blood pressure. However, because some people with more severe hypertension are more vulnerable to the effects of caffeine, its harmful effects may outweigh its life-saving benefits, increasing the likelihood of death. This study b the researchers found out that people who were much younger that consume more than two cups of coffee and also consume much cholesterol without having much effect on them
In contrast, the researchers found that consumption of one cup of coffee or one cup of green tea per day—both of which contained caffeine—did increase the risk of death from cardiovascular disease at any blood pressure measurement. According to the U.S Food and Drug Administration (FDA), an 8-ounce cup of green or black tea contains 30–50 milligrams of caffeine, while your 8-ounce cup of coffee has a range of 80–100 milligrams.
Green tea may be beneficial due to polyphenols, which are micronutrients with healthy antioxidant and anti-inflammatory properties found in producers (plants). The researchers noted that polyphenols were the reason why only coffee consumption was associated with an increased risk of death in people who have hypertension, despite green tea and coffee, which contain caffeine.
The goal of the study, according to its senior author, Hiroyasu Iso, M.D., Ph.D., M.P.H., director of the Institute for Global Health Policy Research, Bureau of International Health Cooperation, and National Center for Global Health and Medicine in Tokyo, Japan, and professor emeritus, was to determine whether the known protective effect of coffee also applies to people with various degrees of hypertension. To their knowledge, this is the first study to discover a link between drinking two or more cups of coffee per day and cardiovascular disease mortality in individuals with severe hypertension.
When the force of blood pushing against blood vessel walls is excessive, high blood pressure results, forcing the heart to pump blood more forcefully than it is capable of. It is measured in mercury millimeters (mm Hg). Hypertension is defined as a blood pressure value of 130/80 mm Hg or greater in the most recent blood pressure recommendations from the American Heart Association and the American College of Cardiology.
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The ACC/AHA recommendations do not exactly match the blood pressure criteria used in this study. Researchers divided blood pressure into five groups: low (less than 130/85 mm Hg), high (between 130 and 139/85 and 89 mm Hg), grade 1 hypertension (between 140 and 159/90 and 99 mm Hg), grade 2 (between 160 and 179/100 and 109 mm Hg), and grade 3 (more than 180/110 mm Hg). In this study, severe hypertension was defined as blood pressure readings in grades 2 and 3.
At the beginning of the research of drinking more than two cups of coffee per day may increase the person’s risk of death if the person has severe hypertension, there were more than 12,000 women and over 6,570 men who participated in the study. Participants’ ages ranged from 40 to 79. The participants were recruited from the Japan Collaborative Cohort Study for Evaluation of Cancer Risk, a large prospective study of people residing in 45 Japanese municipalities, carried out between 1988 and 1990. Data from the participants’ physical examinations were also gathered using self-administered questionnaires that inquired about diet, lifestyle, and medical history.
Trough 2009, almost 19 years of follow- up, cardiac mortality were documented. Analysis of data for all participants showed that:
- People whose blood pressure was 160/100 mm Hg or greater were twice as likely to die from cardiovascular disease if they drank two or more cups of coffee per day compared to those who did not.
- In no blood pressure category was a daily cup of coffee related with a higher risk of dying from cardiovascular disease.
- Across all blood pressure groups, drinking green tea was not linked to an increased risk of cardiovascular disease death.
The assumption that patients with severe blood pressure should refrain from excessive coffee intake may be supported by these data, according to ISO. “because people with high hypertension are more likely to die.”
The study has several limitations, including the self reporting of coffee and tea consumption, and the use of a single point of measurement for blood pressure that didn’t account for changes overtime, and the observational design that disallowed the creation of a cause-and-effect relationship between coffee intake and the risk of cardiovascular disease in the individuals with extremely high cholesterol.
Additional research is needed, according to the experts, on the effects of coffee and green tea consumption in people with high blood pressure as well as on the effects of coffee and green tea consumption abroad.
Conclusion
This research has brought to light how drinking more than two cups of coffee per day may increase the person’s risk of death if the person has severe hypertension. It is worthy thing to note. Let us know what you think in the comment section.
