Is drinking black tea good for heart health?
What is black tea ?
Black tea is fermented and dried. When fermented, the tea turns into a red oxide under the action of oxidase and becomes black tea. Black tea has a mild taste and a mellow taste. In addition to a variety of water-soluble vitamins, it is also rich in trace element potassium. When brewed, 70% of potassium is soluble in tea. Potassium has the effect of enhancing blood circulation in the heart and can reduce the consumption of calcium in body.
Rich flavonoids in black tea can eliminate free radicals and have anti-acidification effect, which reduces incidence of myocardial infarction. Drinking black tea for long term is good for your health,especial good for heart health to avoid coronary artery disease.
Is black tea good for you?How to improve heart health ?
Black tea is the most oxidized and therefore black. Most of benefits of black tea come from strong phytochemical polyphenols. Does black tea have caffeine ?In the same size cup, caffeine content in black tea is about half that of coffee. Clinical trials published in Preventive Medicine Journal showed that 36% of people who drank 3 cups of black tea a day had reduced levels of triglycerides and 17% had improved cholesterol levels.
According to the latest research, drinking three cups of tea a day not only quenches thirst but also stabilizes blood pressure - not only lowers blood pressure, but also makes blood pressure index more stable at night.
Drinking 3 cups of black tea a day is more beneficial.
Black tea benefits come mainly from the flavonoids, an antioxidant that prevents cardiovascular disease.
According to relevant data, in UK 350 people suffer from stroke or heart disease every day due to high blood pressure, which can be predicted and prevented. High blood pressure can cause heart disease, which is a clear conclusion. The new study shows that blood pressure changes during the day is also a risk factor. Professor Jonathan Hodgson of the University of Western Australia said: "Drinking tea is good for your heart health, because it proves the specific relationship between tea and important risk factors for heart disease. That show black tea can reduce nighttime blood pressure fluctuations.
Hypertension refers to a blood pressure measurement index that is 140/90 mm hg higher, and 140 is a contraction value, which represents pressure value that each heart beat brings to blood. In experiment, 111 men and women with a blood pressure contraction value of 115-150 mm hg drank 3 cups of black tea per day for 6 months, or a cup of beer containing no flavonoids or caffeine. They measured blood pressure at three time points: first day, third month and sixth month.
The data showed that people who drank black tea had a 10% lower rate of blood pressure change at night, and this effect was evident from the first day of tea drinking and continued after 6 months. Researchers said that this is because of flavonoids, past studies have found that drinking 3 cups of black tea a day can lower blood pressure by 2 to 3 mm hg. Moreover, another study found that even adding milk to black tea would not affect this benefit.
The research paper has been published in The American Journal of Clinical Nutrition.
Dr. Tim Bond, of the Tea Association Advisory Board, said: "Hypertension is a widely recognized cardiovascular and lethal risk factor. Traditionally, blood pressure values are a risk, but blood pressure changes are now considered a Potential risks. Black tea and its flavonoids are closely related to improving blood pressure and cardiovascular health. Regular consumption of black tea is thought to lower blood pressure. Because black tea contains flavonoids, there are many other health benefits. Especially for the heart, many recent studies have shown that flavonoids are like magic, whether it is increased milk or not. It is very simple to drink four or more black tea a day, which is very good for us."
As part of a heart-healthy diet plan, doctors or dietitians may recommend drinking more tea for good reason and healthy lifestyle.Soothing aromatic teas can bring many physical and mental benefits. Caffeine in tea is significantly lower than coffee, and there are many differences tea brewing methods for different type, brand and processing tea.
There is no harm in black tea, but some side effects exist. For example, people with anemia, mental weakness and insomnia. Refreshing effect of black tea will make them worse for insomnia.
Drinking black tea side effects notes:
1.Drink black tea should be appropriate. Generally, adults take 9-15 grams per day, 5-8 grams per time. It is advisable to drink more than 3 times a day. Avoid excessive drinking black tea.
- Warm black tea is better.
- Sugar black tea or milk black tea is good choice for english breakfast or afternoon tea - black tea with sugar, black tea with milk, but need to be used with caution, overweight or obese and diabetics avoid drinking sugar tea, allergies or poor gastrointestinal function, drink carefully or avoid drinking milk tea.
4.Avoid drinking fresh black tea, fresh black tea should not drink too much. After drinking fresh black tea, there will be "drunken tea syndrome", dizziness, insomnia, limb weakness, stomach pain, abdominal distension, constipation and other symptoms, so fresh black tea is not suitable for drinking less than half a month after storage.
- Avoid drinking black tea before sleeping. Avoid drinking black tea within 2 hours before going to bed to prevent mental excitement, affects sleep and even insomnia. People with neurasthenia should ban tea afternoon.
- Avoid steeper black tea for long time, long time steeper will lose vitamins and other black tea benefits nutrients, but also easy to sputum deterioration. Don't drink overnight black tea.
- Prohibited drink black tea to take drug, and do not drink black tea within 1 hour before and after taking drug.
In addition, it is necessary to pay attention to: avoid drinking inferior tea or metamorphic tea; high blood pressure patients, diabetics, etc. avoid drinking strong black tea.
Conclusion:Black tea is a whole fermented tea. Black tea is rich in carotene, vitamin A, calcium, phosphorus, magnesium, potassium, caffeine, isoleucine, leucine, lysine, glutamic acid, alanine, aspartic acid. And many other nutrients. The chemical reaction of polyphenols in the fermentation process of black tea makes the chemical composition of fresh leaves change greatly, which will produce components such as theaflavins and thearubigins. Aroma of black tea is significantly higher than that of fresh leaves, forming black tea unique color and fragrance and taste.
Drinking black tea for long term is good for your heart health.Avoid heart failure,heart rhythm,atrial fibrillation,coronary arteries, etc .,reduce high cholesterol, high blood pressure risk factors, risk of stroke.Start healthy lifestyle with a cup of black tea everyday.