Is coffee bad if you have high blood pressure

March 26, 2002 -- Although drinking a cup of coffee a day may slightly raise your blood pressure, it won't likely increase your risk of developing high blood pressure.

In a new study, researchers say a connection between high blood pressure and coffee drinking has been discussed for decades, but no studies have actually established this link. Previous research has shown that coffee temporarily increases blood pressure immediately after consumption, but the body quickly adapts to that effect. Other studies have hinted that there might be a more persistent relationship between coffee drinking and the risk of developing high blood pressure over time.

In this study, which appears in the March 25 Archives of Internal Medicine, researchers tracked the coffee intake and blood pressure of a group of male medical school graduates for 33 years. They found that drinking one cup of coffee a day led to small increases in blood pressure, but long-term coffee drinking did not significantly increase the risk of developing high blood pressure.

People who didn't drink coffee were less likely than coffee drinkers to have high blood pressure, but there was no progressive increase in risk associated with higher levels of coffee intake, according to the researchers.

Researchers say the impact of coffee on the heart and blood vessels may also vary according to how the coffee is prepared. For example, passing boiled coffee through a paper filter removes compounds that have been shown to raise cholesterol levels.

The authors note that studies have shown that stopping coffee drinking can lower blood pressure in people who already have high blood pressure, and the results of this study may not apply to that group of people.

High blood pressure can often be prevented or reduced by eating healthily, maintaining a healthy weight, taking regular exercise, drinking alcohol in moderation and not smoking.

Healthy diet

Cut down on the amount of salt in your food and eat plenty of fruit and vegetables. 

The Eatwell Guide highlights the different types of food that make up our diet, and shows the proportions we should eat them in to have a well-balanced and healthy diet.

Salt raises your blood pressure. The more salt you eat, the higher your blood pressure. Aim to eat less than 6g (0.2oz) of salt a day, which is about a teaspoonful.

Find out how to cut down on salt

Eating a low-fat diet that includes lots of fibre, such as wholegrain rice, bread and pasta, and plenty of fruit and vegetables also helps lower blood pressure.

Aim to eat 5 portions of fruit and vegetables every day.

Find out how to get your 5 A Day

Limit your alcohol intake

Regularly drinking too much alcohol can raise your blood pressure over time.

Staying within the recommended levels is the best way to reduce your risk of developing high blood pressure:

• men and women are advised not to regularly drink more than 14 units a week
• spread your drinking over 3 days or more if you drink as much as 14 units a week

Find out how many units are in your favourite drink and get tips on cutting down.

Alcohol is also high in calories, which will make you gain weight and can further increase your blood pressure.

Lose weight

Being overweight forces your heart to work harder to pump blood around your body, which can raise your blood pressure.

Find out if you need to lose weight with the BMI healthy weight calculator

If you do need to lose some weight, it's worth remembering that just losing a few pounds will make a big difference to your blood pressure and overall health.

Get advice on losing weight safely

Get active

Being active and taking regular exercise lowers blood pressure by keeping your heart and blood vessels in good condition.

Regular exercise can also help you lose weight, which will also help lower your blood pressure.

Adults should do at least 150 minutes (2 hours and 30 minutes) of moderate-intensity aerobic activity, such as cycling or fast walking, every week.

Physical activity can include anything from sport to walking and gardening.

Cut down on caffeine

Drinking more than 4 cups of coffee a day may increase your blood pressure. 

If you're a big fan of coffee, tea or other caffeine-rich drinks, such as cola and some energy drinks, consider cutting down.

It's fine to drink tea and coffee as part of a balanced diet, but it's important that these drinks are not your main or only source of fluid.

Stop smoking

Smoking does not directly cause high blood pressure, but it puts you at much higher risk of a heart attack and stroke.

Smoking, like high blood pressure, will cause your arteries to narrow.

If you smoke and have high blood pressure, your arteries will narrow much more quickly, and your risk of heart or lung disease in the future is dramatically increased.

Get help to stop smoking