The researchers also noted that genetic variation among individuals could affect how they metabolize caffeine. A review concluded that people with high blood pressure should exercise some caution when drinking coffee but do not need to avoid it. The review found that although there were older reports of a link between coffee drinking and hypertension, more recent studies suggested that 3—4 cups a day had either a neutral or beneficial effect.
A study of 40 healthy regular coffee drinkers found that all types of coffee increased blood pressure but that the levels stayed within healthy ranges. The increase in blood pressure was temporary but still measurable 3 hours after consumption. Some research suggests that the amount of coffee that someone drinks determines its effects on blood pressure. A study indicated an increase in systolic blood pressure only in people who did not consume coffee frequently.
Another review found that habitual coffee consumption of more than 3 cups a day did not increase the risk of hypertension. However, there was a slightly elevated risk associated with 1—3 cups a day. As coffee contains many different compounds aside from caffeine, other compounds could be responsible for its effects on blood pressure. However, a person could try switching to decaffeinated coffee to see whether their blood pressure decreases.
Some people find drinking coffee causes insomnia , anxiety , or tremors. Others may notice reflux and heartburn. Anyone who experiences these symptoms due to coffee should avoid drinking it.
According to researchers , regular coffee drinkers may experience withdrawal symptoms, such as headaches and low mood, if they suddenly stop consuming it. Therefore, if they wish to reduce their consumption, they should cut down the number of cups gradually. The authors of a review in JACC: Clinical Electrophysiology note that some doctors recommend that people with atrial fibrillation or other conditions involving an irregular heartbeat avoid coffee.
However, they concluded that a regular intake of up to milligrams of caffeine per day appears to be safe and may even be protective against heart rhythm disorders.
The researchers cautioned, though, that if there is a clear association between arrhythmia episodes and caffeine, a person should not drink coffee. Some alternatives to coffee contain caffeine, while others are naturally caffeine-free. People can try:. If someone experiences concerning symptoms when they drink coffee, they may wish to speak to a doctor. Those who notice an increase in blood pressure should seek medical advice. Research suggests that people with high blood pressure can drink coffee as long as they are cautious.
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Reading food labels Renal diet for vegetarians Resperate: Can it help reduce blood pressure? One very well-known study examined more than 85, women over a ten-year period and found that there was no increased risk of these diseases, even in women who drank more than six cups of coffee per day.
While some studies have shown a weak link between caffeine and elevations in blood pressure, the results are complicated and only consider short-term effects. For example, one widely quoted study found that blood pressure rose slightly in subjects almost immediately after consuming a caffeinated beverage and that this blood pressure rise was more pronounced in people with pre-existing high blood pressure.
However, these elevations were not very large and only lasted a short time. The study also showed that in about 15 percent of people with existing high blood pressure, drinking a caffeinated beverage actually caused a decrease in blood pressure.
Two important studies published in further supported the existing body of evidence by again demonstrating that:. One interesting study showed that the caffeine-blood pressure relationship may be more complicated than expected. The study examined how the amount of coffee consumed affected the risk of developing high blood pressure.
While the results showed that the risk of high blood pressure was the lowest for those who drink no coffee, it also showed that those who drink a lot of coffee have almost the same risk. In an unexpected twist, people who drank only small amounts of coffee cups per day seemed to have the highest risk.
It is believed that over time, the body becomes tolerant to the stimulant effects of caffeine. Coffee and tea may actually have many health benefits.
While green tea was popular for several years as a healthy source of vitamins and antioxidants , newer research has shown that darker beverages like black tea and coffee may actually be better for you.
These dark beverages are a rich source of compounds called polyphenols, which may protect against both heart disease and several types of cancer. Some studies, for example, have consistently demonstrated a decreased risk of liver cancer in men who drink coffee. Coffee and tea polyphenols have been shown to lower the level of activated platelets in the blood, which may help prevent blood clots that can lead to stroke.
Decreases in CRP have previously been shown to lower the risk of cardiovascular disease, heart attack, and certain types of kidney disease. Though coffee and tea contain a lot of polyphenols, other types of polyphenols can be found in different foods. All polyphenols have been shown to have health benefits, but the most beneficial besides those in coffee and tea seem to be:.
While the scientific evidence should reassure you if you are a coffee or tea drinker, it doesn't mean you should start because of the potential health benefits. A balanced diet rich in fruits and vegetables is also a great source of polyphenols and polyphenol-related compounds. Looking to start a diet to better manage your high blood pressure? Our nutrition guide can help. Mechanisms of caffeine-induced diuresis. Med Sci. Coffee consumption and coronary heart disease in women.
A ten-year follow-up. Coffee consumption and risk of hepatocellular carcinoma: a meta-analysis of eleven epidemiological studies.
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