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Effect Of Caffeine On Blood Pressure

Does Caffeine Increase Blood Pressure

Does Caffeine cause High Blood Pressure?

Caffeine is a natural stimulant found in the nuts, berries, and leaves of certain plants. Caffeine is most commonly consumed as coffee or tea products, and some have estimated that these beverages may be the most widely consumed foods in the world.

Because caffeine is so common in all human cultures, a great deal of research has been done to discover the health effects of caffeine. Relationships between caffeine and heart disease, as well as the caffeine-blood pressure link, have been especially active fields of study.

May Increase Blood Pressure Temporarily

Science suggests that the physiological effects of drinking coffee can extend beyond a small dose of wakefulness. Research indicates that it may increase blood pressure for a short time after consumption.

A review of 34 studies showed that 200300 mg of caffeine from coffee approximately the amount youd consume in 1.52 cups resulted in an average increase of 8 mm Hg and 6 mm Hg in systolic and diastolic blood pressure, respectively .

This effect was observed for up to three hours after consumption, and results were similar in people with normal blood pressure at baseline and those with pre-existing high blood pressure.

Interestingly, regular coffee consumption is not associated with the same impact on blood pressure which may be due to the caffeine tolerance that develops when you habitually drink it .

Based on this data, a small to moderate increase in your blood pressure may occur after drinking a cup of coffee especially if you drink it infrequently.


Research indicates that coffee may increase blood pressure for up to three hours after consumption. However, if you drink it regularly, this effect is diminished.

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Effect Of Coffee On Physiological Well

Firstly, it is important to understand the physiological effect of coffee and its chemical nature. Coffee is a daily staple for many and it is an extremely popular beverage. This can be seen through the growing amount of coffee shops on UK High Streets. It is however important to note that Britains intake of coffee is relatively low in comparison to other countries in Europe

An ingredient in coffee called caffeine is a naturally occurring chemical stimulant called trimethlxanthine and this acts as a stimulant in the body and antagonises the A1 and A2 adenosine receptors.

Figure 2.

In the cells caffeine stops the development of a chemical named phosphodiesterase that breaks up the second chemical messenger cyclic adenosine monophosphate inside cells. These second messengers are molecules that transmit messages acquired at receptors that exist on the surface of the cell to specific molecules in the cytosol or nucleus.

Some Reports Say Theres No Direct Link Between Caffeine And Blood Pressure

Health Effects Of Caffeine

According to Mayo Clinic:

Caffeine can cause a short, but dramatic increase in your blood pressure, even if you donât have high blood pressure. Itâs unclear what causes this spike in blood pressure. Some researchers believe that caffeine could block a hormone that helps keep your arteries widened. Others think that caffeine causes your adrenal glands to release more adrenaline, which causes your blood pressure to increase.

Recent studies, however, have repeatedly reported that caffeine doesnt necessarily lead to an increased blood pressure, nor does it up the risk for cardiovascular diseases like high blood pressure, heart disease and cardiac arrest. also states a well-known study stating that theres no direct link between caffeine and a rise in blood pressure:

One very well-known study examined more than 85,000 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.

The Joint National Committee on Hypertension likewise reports that theres indeed no evidence that caffeine leads to high blood pressure.

And heres another silver lining:

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The Effects Of Caffeine On Your Body

Many of us rely on a morning cup of coffee or a jolt of caffeine in the afternoon to help us get through the day. Caffeine is so widely available that the U.S. Food and Drug Administration , says about 80 percent of U.S. adults take some form of caffeine every day. But caffeine does so much more than just keeping you awake. Its a central nervous system stimulant that affects your body in numerous ways.

Knowing the symptoms of caffeine and its long-term effects on your body may make you think twice about having that fourth cup of coffee. Read on to learn more about these effects.

Caffeine provides no nutritional value on its own. Its tasteless, so you wont necessarily know if its in your food either. Even some medications may contain caffeine without your knowledge.

This ingredient almost always causes some symptoms. At a minimum, you may feel more energetic, but over time, too much caffeine may cause withdrawal symptoms. According to the Mayo Clinic, its safe for most healthy adults to consume up to 400 milligrams of caffeine per day. Keep in mind that a standard size cup of coffee is eight ounces. If youre using a mug or getting your fix at a coffee house, chances are youre drinking 16 ounces or more, so reading labels is important.

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How Coffee Affects Blood Pressure Readings

A blood pressure reading consists of two numbers, each of which measures the pressure against your arteries as your blood is moving through them systolic blood pressure is the reading when your heart beats, and diastolic blood pressure is the reading between beats. According to the CDC, a normal blood pressure reading falls under a systolic reading of 120 and a diastolic reading of 80.

Coffee and other caffeinated beverages cause the muscles of the arterial walls to tighten and the blood vessels’ diameter to decreasea process called vasoconstrictionwhich raises blood pressure, notes cardiologist Dr. Seamus Whelton of Johns Hopkins Medicine. But studies have shown that blood pressure spikes from coffee last only a few hours. Habitual coffee drinkers likely develop a tolerance. In fact, one study showed that after two weeks of drinking coffee, the blood pressure increase had vanished. However, says Dr. Whelton, if you are keeping a close watch on your blood pressure, you should refrain from caffeine for at least half an hour before taking your readings.

Caffeine As A Stimulant

Caffeine & the Heart: Your Health

Caffeine is considered as a stimulant because it can increase the activity of your central nervous system that keeps you awake, alert and focus. But this increased activity could also trigger your blood vessels to constriction. With this, your blood pressure will increase and alter the blood supply of the heart. Expert says that this is the most dangerous effects of strong stimulant like cocaine and methamphetamine.

However, caffeine is a very mild stimulant and stays quickly in your body and it is a self-limiting stimulant as it acts on the kidneys increasing its excretion rate.

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Caffeine And Blood Pressure Response Over Sex Age And Hormonal Status

Caffeine may impact blood pressure depending on your age and gender, but exactly how much is unclear, and likely unimportant for most of the population. The only group that might want to be careful about caffeine intakeor at least monitor its effect on blood pressureare people over 70. And women over 70 should be the most careful, if they are hypertensive.

I dont think caffeine poses any severe risks to people with blood pressure in the normal range, and it doesnt have to be avoided. There is really no solid science pointing to potential dangers, regardless of sex or age. If you drink a coffee or two in the morning and feel OK, I see no reason to stop.

But if you have high blood pressure or are hypertensive, it might be worthwhile switching to decaf. Ultimately, your current blood pressure is the determining factor on whether or not caffeine can pose a risk.

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High Blood Pressure Is A Real Problem

Surprising Effects of Caffeine on the Brain and Nervous System

High blood pressure is one of the most common health ailments we face. Nine out of ten individuals in the U.S. will face it at some point in their lives .

There are two main forms of it, primary and secondary. Primary tends to develop over time with no specific known cause. Secondary is the result of another condition, such as sleep apnea, drug abuse, or kidney disease .

Either one can be seriously problematic if left alone and untreated. They can raise your risk for heart disease or stroke, among other things.

The secondary variety is more straightforward to deal with. You treat the cause and it should get better. When the cause is unknown however, you have to start studying the problem for risk factors.

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Negative Effects Of Caffeine

Caffeine can have a disruptive effect on your sleep. The most obvious effect of the stimulant is that it can make it hard for you to fall asleep. One study also found that caffeine can delay the timing of your body clock. These effects will reduce your total sleep time. Caffeine also can reduce the amount of deep sleep that you enjoy.

The effects of caffeine can occur even when you consume it earlier in the afternoon or evening. One study found that consuming caffeine 6 hours before bedtime reduced total sleep time by 1 hour. These effects also can be stronger in older adults. It takes their bodies a longer time to process caffeine. Regularly consuming high doses of caffeine may cause complications during pregnancy.

At high doses, caffeine can produce these common side effects:

  • Increased breathing rate
  • Muscle tremors

Withdrawal symptoms can occur when you stop taking caffeine after using it regularly for a long time. These symptoms include:

  • Low energy levels

The FDA is collecting reports of adverse events that have occurred in people who took products marketed as energy drinks or energy shots. The FDA cautions consumers that products marketed as energy shots or energy drinks are not alternatives to sleep.

Caffeine powder is highly potent, and a safe serving size is extremely small. It is nearly impossible to measure caffeine powder accurately in the home. As a result the risk of an accidental, lethal overdose is high.

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How To Drink Less Coffee

There are various ways to drink less caffeine without having to give up coffee completely.

One thing to keep in mind though is that its best to reduce the amount of caffeine youre getting gradually as a sudden drop in can give you mild withdrawal symptoms like headaches. Heres what you can do:

Drink coffee thats lower in caffeine

As well as simply drinking less cups of coffee, you can also lower your caffeine intake by switching to a lower-caffeine kind of coffee if you really cant bear to drink decaf!

In general, espresso coffees contain less caffeine than brewed/filter coffee, and coffee made from Arabica coffee beans contains half the caffeine of coffee made from robusta beans.

A good way to control your caffeine levels is to make your own coffee. Experiment with different flavours and methods to see what you like, and take the time to make a really good coffee that youll really relish and enjoy quality rather than quantity and with less caffeine!

NOTE: Theres a very informative article on the caffeine content of different types of coffee here: High Caffeine Coffee Which Coffee is the Strongest?

Drink tea instead of coffee

You can also wholly or partially replace coffee with other less-caffeinated drinks like black tea and green tea. Remember that these still contain caffeine, though much less than coffee, so remember to factor in their caffeine content when figuring out how to stay under your daily caffeine limit.

Drink herbal teas and cordials


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