1. Tea can increase and decrease blood pressure
Tea contains tea polyphenols, alkaloids, vitamins and other substances. Among them, tea polyphenols and vitamins have a protective effect on blood vessels, can increase blood vessel elasticity, and drinking tea will also produce diuretic effects, which can promote sodium ion in the body. Excretion, these effects all contribute to the reduction of blood pressure.
But tea also contains alkaloids such as caffeine and theophylline, which can excite nerves. There is a traditional Chinese saying that drinking tea is refreshing, which is to take advantage of this. Nerve excitement will speed up the heartbeat and constrict blood vessels, so drinking tea may also increase blood pressure. Therefore, people with high blood pressure can drink tea, but they must master the correct way to drink tea.
2. People with high blood pressure should drink weak tea
There is a saying in science called “to talk about toxicity without dosage, it is to be a hooligan”, this sentence also applies to tea drinking. If you want the caffeine in the tea to affect blood pressure, you need to take enough doses. Although tea contains caffeine, the content is not high. As long as the tea is not very strong, the effect on blood pressure is not significant.
Alkaloids have a bitter taste, so when you drink tea, you can roughly judge the amount of caffeine in the tea by taste. If it is too bitter, it means that it contains more caffeine, which may affect blood pressure. Normal tea, except for those who are extremely sensitive to caffeine, most people with high blood pressure can drink it normally.
3. Things to pay attention to when drinking tea for hypertensive patients
1. Green tea is better than black tea: The tea polyphenols in tea help regulate blood pressure, blood lipids, and maintain the vascular intima. The content of tea polyphenols in green tea is about 18%, while the content of tea polyphenols in black tea is about 10%. Therefore, from the perspective of cardiovascular benefits, people with high blood pressure are more suitable to drink green tea.
2. Don’t drink hot tea: Some people like to drink hot tea when they drink tea. This habit is not good. The water temperature is too hot to damage the esophageal mucosa and gastric mucosa. If you are used to drinking hot tea for a long time, the mucosa is repeatedly damaged and repaired, which will increase the probability of esophageal cancer and gastric cancer.
3. Do not take the medicine with tea: the tea polyphenols in tea are a kind of tannins, which will form insoluble complexes with protein and metal ions. However, most medicines contain metal ions. If the medicine is taken with tea, it may interact with each other and affect the absorption of the medicine. Therefore, use normal cold water when taking medicine, and there should be more than 2 hours between taking medicine and drinking tea.
4. Do not drink tea before going to bed: The caffeine and theophylline in the tea will excite the nervous system and will also produce diuretic effects, resulting in difficulty falling asleep and increasing the frequency of urination at night. Poor sleep can lead to increased blood pressure, which is an unfavorable factor in blood pressure control.
To sum up, the tea polyphenols in tea can nourish blood vessels and are beneficial to blood pressure, while caffeine and theophylline can excite nerves and raise blood pressure. People with high blood pressure can drink normally as long as the tea is not very strong. In the choice of tea, green tea has better cardiovascular benefits than black tea. Note that tea and medicine should be taken separately, the water temperature should not be too hot, and it is best not to drink tea before going to bed.