It is not advisable to drink tea within 3 ~ 4 hours before going to bed. Tea contains a lot of caffeine, which has a strong exciting effect. According to the determination, each cup of strong tea contains 100 mg of caffeine, which will make the brain excited, increase blood flow and accelerate the heartbeat, making it unable to sleep for a long time.
2. Patients with heart disease and hypertension
Excessive drinking tea will increase the burden on the heart, increase the heart rate and blood pressure, which is extremely unfavorable to patients with heart disease and hypertension.
3. Patients with osteoporosis
Drinking strong tea often will lead to calcium deficiency, because on the one hand, caffeine in strong tea will promote the excretion of calcium in urine; On the other hand, caffeine can inhibit the absorption of calcium in the intestine, making the absorption of calcium incomplete.
4. Patients with atherosclerosis
Tea contains many bioactive substances, such as caffeine, theophylline and theobromine. It can accelerate the excitability of cerebral cortex, cause cerebrovascular contraction, insufficient blood supply, slow blood flow and promote cerebral thrombosis. It can also cause coronary artery contraction spasm, myocardial ischemia, angina pectoris, palpitation, chest tightness and arrhythmia.
5. Patients with ulcer disease
Drinking a lot of tea before and after meals will dilute gastric juice and affect digestion. Drinking a lot of tea will greatly increase the secretion of gastric acid, affect the healing of ulcer surface and aggravate the condition. Patients with ulcers should drink less tea, especially not a lot of strong tea.
6, habitual constipation
Soaking tea for too long will precipitate a lot of tannic acid, which will not only affect appetite, but also slow down intestinal peristalsis and aggravate constipation.
7, anemia patients
You can't drink tea. Tannic acid in tea can precipitate iron in diet, which is not easy to absorb. Iron is an important raw material for making red blood cells. Iron deficiency in the body will hinder the production of red blood cells and cause iron deficiency anemia. Long-term tea drinkers often have different degrees of iron deficiency, which has the greatest impact on the constitution of blood deficiency and blood deficiency.
8. High fever
It is not advisable to drink strong tea, and it is best for patients with fever to drink boiled water, mineral water or light tea. Theophylline can raise body temperature and aggravate fever, and its diuretic effect will also reduce the efficacy of antipyretic drugs.
9, gout patients
Not suitable for drinking tea. Tannic acid in tea will aggravate the condition, so it is not advisable to drink more tea brewed for too long.
There are three best times to drink tea:
1, a cup of scented tea at 9 am.
The first cup is morning tea, which is suitable for 9:00- 10 after breakfast. It can refresh, detoxify and resist fatigue, which is the most important of the three cups of tea. The best choice for morning tea is scented tea. After secondary processing, scented tea mixes the richness of flowers with the fragrance of new tea, which can refresh the mind. However, it should be noted that people with insomnia are not suitable for drinking scented tea, otherwise it will cause more serious sleep disorders, and people with allergies should not drink scented tea.
2. Afternoon 1 a cup of green tea.
The second cup is afternoon tea, preferably after lunch or nap 1 until 3 o'clock. Afternoon tea can be moderately dark, which can reduce blood fat and protect blood vessels. Jiang Yongwen said that green tea has health care functions such as antioxidation, scavenging free radicals and antivirus.
If the brewing temperature is too high or the time is too long, polyphenols will be destroyed. Generally speaking, the water temperature of green tea brewing is 85℃, and the water can be boiled at first. Brewing time is 2-3 minutes.
3. Have a cup of black tea at 6 pm.
The third cup is evening tea, which is suitable for drinking from 6: 00 to 7: 00 after meals. It has the effects of reducing blood fat and helping digestion. Black tea is most suitable for drinking at night, because fermented tea has low caffeine content and has little effect on sleep. People with cold constitution can drink more black tea.
In terms of tea making, unlike green tea, soaking in high water temperature can promote the effective dissolution of flavonoids in black tea, so it is best to use boiling water for soaking black tea for a relatively long time. Generally speaking, 5 minutes is the best.
Refer to People's Network-Ten Kinds of People Not Suitable for Drinking Tea
People's Network-There are three best times for drinking tea. Four types of people should not drink tea for health preservation.