Demographic And Anthropometric Factors
During a clinic visit, all participants completed a questionnaire, which collected information about age, smoking history, physical activity and residential postal code. Weight and height were measured, and the BMI was calculated in kg/m2. Smoking status was coded into nonsmoker, ex-smoker and current smoker. For physical activity, the women filled in a questionnaire that included the following question: Do you participate in any sports recreation or regular physical activity? Those who answered yes to this question were asked to list up to four activities and the duration that they engaged in each activity. Women who answered no to the activity question were classified as being sedentary and scored zero for activity. Activity levels in the active women were calculated in kJ/d using published energy costs of listed activities. Socioeconomic status was assessed using relative social advantage according to residential postal codes. This variable was divided into two levels: high and medium-to-low advantage.
Can Green Tea Help Lower Blood Sugar New Study
Lab research has linked green tea and its compounds to many potential health benefits, including preventing cancer and type 2 diabetes. High blood sugar, also known as hyperglycemia, is a risk factor for diabetes, and having diabetes also increases your chances of getting cancer.
A new animal study now suggests that a compound found in green tea may reduce the spike in blood sugar that occurs after eating starchy foods.
The study was published in the journal Molecular Nutrition & Food Research.
In the study, mice were placed on a corn starch diet to mimic what happens when humans eat starchy foods. The mice were then fed an antioxidant found in green tea called epigallocatechin-3-gallate . The researchers found that, in mice given EGCG, the blood sugar spike that typically occurs after eating was significantly reduced compared to mice that were not fed the antioxidant.
If we were to drink the amount of EGCG given to these mice, it would be approximately the same as one and a half cups of green tea, according to the authors.
The study suggests that this green tea effect is limited to starchy foods consumed simultaneously with green tea. Meaning that, drinking tea hours after eating a sleeve of crackers probably wont help reduce the rise in blood sugar that is bound to happen. Also, adding sugar to a cup of tea may actually eliminate the effect since table sugar is already in a simplified form that can readily enter the bloodstream.
Does Caffeine In Green Tea Constrict Blood Vessels
No! In fact, green tea helps in keeping the arteries relaxed and supple so that there is no problem when there are changes in blood pressure.
A study indicates that green tea is capable of helping vessels relax.
Green tea makes the cells on the lining of the blood vessels secrete chemicals that facilitate the relaxation of the vessels.
The flavonoids in green tea are the antioxidants that ensure the flexibility of the blood vessels. They also have a role to play in preventing the formation of blood clots.
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This Drink Can Be Served Both Hot And Cold
I usually drink this hibiscus tea as an iced tea, but it can also be consumed hot.
- Hibiscus Iced Tea: After adding the lime juice and water, let it cool in the fridge. Or if youre impatient, add a few ice cubes to a glass and pour yourself a glass of delicious hibiscus tea.
- Hibiscus Hot Tea: Run it through a sieve when its still rather hot, add the lime juice, hot water, and enjoy right away.
I do hope youll try to incorporate hibiscus into your diet and enjoy this refreshing herbal tea. It is a perfect pairing with a baked grapefruit, scrambled eggs or chocolate coconut overnight oats as a wholesome and healthy breakfast.
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Chamomile Tea: Sleep Enabler
Though herbal teas do not come from the traditional tea plant, they still have some health benefits, says Brill of soothing herbal teas like linden or chamomile. These teas help with a less-direct, but still crucially important, benefit for cardiac wellness: sleep. One of the things many of my patients have issues with is getting enough sleep, says Steinbaum. Sleep is such an important part of restorative health for everyone. I tell people to get into the habit of having a nighttime routine to wind down, and include a cup of warm chamomile tea right before bed.
Patients with a coronary artery stent, or who are taking aspirin or Coumadin blood thinners, should consult their doctor before drinking chamomile tea, because it may increase risk for internal bleeding.
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White Tea: Good For Circulation
White tea is harvested from the young buds of the tea plant and only briefly processed. This is probably the purest tea, and I recommend it for overall heart health, says Steinbaum. The flavonoids are good for the heart and help dilate the arteries, she explains, by thinning the blood, lowering blood pressure, and reducing bad cholesterol. White tea may help protect not just your heart, but also the entire circulatory system.
But double-check with your doctor if youre taking a blood thinner like Coumadin or are sensitive to caffeine. White tea does contain caffeine, which can speed your heart rate or increase your risk for high blood pressure.
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How Green Tea Raises Blood Pressure
It is thought that the caffeine content in green tea is responsible for causing a rise in blood pressure.
For those who are unaware, green tea is not caffeine-free, although some market it as so. Green tea has some caffeine content, although not as much as coffee.
On average, one cup of green tea contains 35 mg of caffeine.
Considering just the caffeine element of green tea, it generally causes a short and temporary, but dramatic increase in your blood pressure.
This spike is experienced even among those who are not predisposed to high blood pressure.
If you are looking at improving your blood pressure, you might want to consider our list of morning drinks for high blood pressure.
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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
Respiratory Conditions Or Asthma
More and more people are discovering natural ways to minimize the symptoms of asthma and respiratory conditions. Drinking an herbal tea blend can soothe the throat and relax the airways.
- Licorice root makes saliva thicken and triggers mucus production which gently coats and soothes the airways. It also reduces inflammation. Licorice root can raise blood pressure if taken over a long period. Marshmallow root and honey can be used instead.
- The caffeine in black tea can provide up to 4 hours of relief. It works by relaxing the lungs and opening the airways.
- Ginger is an anti-inflammatory as well as an anti-histamine. It relaxes and soothes the throat and lungs.
- Eucalyptus and peppermint have antispasmodic properties that can relax muscles and open airways. They are both powerful decongestants by limiting the production of phlegm and breaking up mucus.
- Thyme reduces the duration of an asthma attack when taken over the long term.
Herbal Tea Blend for Asthma
- Place 1-2 slices of ginger and licorice root in a pot and bring to a boil.
- Add 1 sprig of thyme and simmer for 10 minutes.
- Remove from heat and add a regular black tea teabag and a small handful of either mint or eucalyptus leaves.
- Cover and allow to brew for 5 minutes.
- Strain and serve.
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Effect Of Green Tea Consumption On Blood Pressure
As shown in , a significant reduction in SBP was observed in subjects supplemented with green tea when compared with control subjects. The mean difference in DBP was reported in 13 trials and was found to be significantly different . In addition, no significant differences were detected when we used the different model to pooling the data .
Meta-analysis of effects of green tea on systolic blood pressure .
Weight was assigned with STATA by using number of subjects and SD. Sizes of data markers indicate the weight of each study in this analysis. The diamond represents the overall estimated effect and the result was obtained from a fixed-effects model. WMD, weighted mean difference.
Meta-analysis of effects of green tea on diastolic blood pressure .
Weight was assigned with STATA by using number of subjects and SD. Sizes of data markers indicate the weight of each study in this analysis. The diamond represents the overall estimated effect and the result was obtained from a random-effects model. WMD, weighted mean difference.
Final Thoughts On Tea For High Blood Pressure
A healthy diet plays a major part in decreasing high blood pressure, and tea consumption can be a big part of your diet and overall healthy lifestyle.
In this article, we reviewed the best tea for high blood pressure. The teas we featured for lowering blood pressure included black tea, green tea, oolong tea, white tea, hibiscus tea, basil tea, nettle tea, lemon tea, garlic tea, java tea, rooibos tea, barley tea, and jasmine tea. The caffeine and polyphenols in many of these teas are responsible for the blood pressure reduction.
How do you make tea to lower blood pressure? Steeping green tea will take about three minutes however, any longer and the tannins in this tea will make it bitter. Other teas will take up to five minutes or more to steep.
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Best Tea For Blood Pressure: 2021
High blood pressure has become a common and severe phenomenon today. Hypertension, another name for high blood pressure, has affected many adults. Nearly half of American adults have it. Hypertension is so ordinary it almost becomes like an epidemic. Lack of physical activity, poor eating habits, increased stress, work pressure is significant contributors to hypertension. There are multiple health issues linked to hypertension. It is one of the major causes of various cardiovascular diseases. High blood pressure should not be ignored. It requires on-time treatment. Natural remedies for high blood pressure help control blood pressure. Fiber-rich foods are also helpful.
Similarly, certain teas can help you control hypertension. Your morning cup of fresh, hot tea can make it easier for you to manage hypertension. Teas for hypertension are loaded with other health benefits, resulting in better overall health.
Medications and lifestyle changes help treat the condition. However, the side effects that come with drugs can be worse than the actual hypertension problem. Non-compliance with the medications is also dangerous. As a result of non-compliance, we live with uncontrolled hypertension, which is also tricky. So what do we do if we want to lower and control our hypertension and yet be drug-free?
Flavanols & Blood Pressure
The first study looked at the diets of 25,618 people in the UK and how these foods and beverages affected their blood pressure. And, rather than relying on the participants to self-report what they ate, the researchers used biomarkers in the blood to analyze flavanol intake and metabolism. That way, the study remained as objective and accurate as possible.
The results showed that those with the highest flavanol intake had the greatest reduction in blood pressure, between 2-4 mmHg. According to the researchers, this is comparable to the positive changes in blood pressure experienced by those following a Mediterranean diet or a reduced salt program, such as the DASH meal plan.
Further analysis showed that already-hypertensive participants had a greater response and saw more improvement compared to those with normal blood pressure. The researchers wrote that flavanol intake could therefore have a role in the maintenance of cardiovascular health on a population scale.
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Green Tea & Longevity
Along with its cardiovascular benefits, green tea has been linked to lower risk of dying from any cause among people with type 2 diabetes. Coffeea perennial favorite in the USalso appears to have this benefit.
This too is promising news, as people with diabetes are at a higher risk of succumbing to a host of serious and often fatal complications including cancer, cardiovascular disease, and dementia.
In this five-year study, researchers examined the effects of green tea and coffee , on the risk of death among 4,923 patients with diabetes.
Unlike the first study that relied on biomarkers, this one involved having the participants fill out food and drink questionnaires. They also provided other pertinent information on lifestyle and other health habits
The results showed that compared to not drinking green tea at all:
- One cup of green tea daily was associated with a 15% lower risk of death
- Two to three cups daily were associated with a 27% reduced risk of death and
- Four or more cups per day were associated with a 40% decreased risk of death
Similarly, compared to non-coffee drinkers, coffee drinkers who enjoyed:
- One cup daily had 12% lower odds of death
- Two or more cups every day had 41% lower risk of death
The researchers also found that the people who drank both coffee and green tea every day experienced a:
As you can see, individually, green tea and coffee have some powerful effects. But together, the benefits multiply.
Not Just A Snake Oil Myth Green Tea Can Really Lower Blood Pressure
Overall, green tea is a great choice for hypertension sufferers, helping to correct root causes of high blood pressure:
- Reduce stress levels
- Reduce sugar intake and weight
- Improve arterial size and heart function
- Increase mental clarity
Many studies have been performed showing the effectiveness of green tea on health, but green tea has been used for centuries by Japanese who knew the health benefits before our modern societies started conducting tests. Japanese people have one of the arguably healthiest diets in the world, and the best life expectancy in the world, mainly due to diet, which includes a healthy amount of green tea. In fact, green tea is so popular you can find many other foods in green tea flavors. Not only is green tea delicious, its a great way to increase your overall health and life expectancy by helping to take care of your vascular system and decrease blood pressure and the work your heart has to do on a daily basis.
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Role Of Caffeine In Tea To Lower Blood Pressure
The simulant caffeine is found in traditional black, green, white, and oolong teas. The teas also contain small amounts of theophylline and theobromine, which are stimulants as well. Moreover, they belong to a class of organic compounds called xanthines, which are similar to caffeine.
Theobromine, also found in chocolate, is known to stimulate the heart however, it also improves blood flow, dilates blood vessels, and has a mild diuretic effect. As a result, theobromine is able to reduce high blood pressure.
Role Of Polyphenols In Regulating Blood Pressure
The main polyphenols in teas include theaflavins, catechins, flavonoids, and tannins. In particular, green tea and black tea contain the catechin epigallocatechin gallate , plus other catechins like epicatechin, epigallocatechin, and epicatechin gallate. Green tea also contains flavonols like quercetin and kaempferol.
What are the benefits of catechins in tea for high blood pressure? Catechins are able to maintain blood pressure balance through the regulation of nicotinamide adenine dinucleotide phosphate oxidase gene subtype and promote the expression of heme oxygenase.
Research also shows that catechins can inhibit RNA expression in patients with high blood pressure.
The EGCG and epicatechin have particularly strong heart health-promoting, antihypertensive capabilities. The concentration of catechins in green tea is also thought to be much higher than that of black tea.
Studies show that EGCG significantly reduces blood pressure in hypertensive rats. EGCG stimulates nitric oxide production, and this suggests that it can improve symptoms of hypertension.
The tannins, flavonoids, and theaflavins in tea have also been reported to lower blood pressure. Quercetin is also able to reduce blood pressure and lower the severity of hypertension, according to human studies. Quercetin is able to improve heart health by reducing oxidative stress.
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Green Tea And Diabetes
A growing body of research shows how drinking green tea can help people prevent the onset of diabetes. But green tea is also good if you are already diagnosed with diabetes. The polyphoenols in green tea help reduce oxidative stress and widens the arteries, decreasing blood pressure, prevents clotting and reduces cholesterol. All these activities reduce the risk of heart disease, which is elevated in people with diabetes.
Lower blood pressure and weight loss, increases insulin sensitivity and lowers blood sugar levels. Green tea contains high levels of catechins that helps reduce the effects of insulin resistance by decreasing the digestion and absorption of carbohydrates.
Green tea alone will not control blood sugar and cholesterol levels, it needs to be complemented with a balanced diet that’s low in added sugars, simple carbs and saturated fat. Follow up with monitoring your numbers carefully to track progress.
Drinking green tea may also of developing type-2 diabetes. Studies have shown that those drinking green tea were up to 33% less likely to develop this form of diabetes. Green tea has other benefits including a calming effect due to it containing L-theanine. It helps reduce anxiety and stress and prevents stress-related increases in blood pressure.