What are the benefits and contraindications of green tea and black tea? Green tea belongs to unfermented tea, which is cold and has the functions of relieving dryness and heat, refreshing the mind, diuretic drowsiness, and anti-oxidation. Drinking in moderation can promote metabolism and moisten the throat, but those with a deficient constitution should not use it. Black tea is a kind of fully fermented tea, which is mild and has the functions of warming the stomach and preventing cold, promoting body fluid and relieving fever, and improving color. However, it is forbidden for people with dry heat. The details are as follows:
What are the efficacy and taboos of green tea and black tea?
The benefits of green tea:
1. Slow down aging
Green tea contains tea polyphenols, which have strong antioxidant and physiological activities and are scavengers of free radicals in the human body. 1 mg of tea polyphenols scavenges excess free radicals harmful to the human body is equivalent to 9 micrograms of superoxide dismutase (SOD), much higher than other similar substances. Tea polyphenols can block lipid peroxidation and remove active enzymes.
2. Lipid-lowering aids digestion
Green tea is rich in caffeine, which can increase gastric secretion, aid digestion, and enhance the ability to break down fat. Green tea contains amino acids, phenolic derivatives, aromatic substances, vitamins, etc. The combined action of these substances, especially tea polyphenols, catechins, and vitamin C, can promote fat burning and lower blood lipids and cholesterol.
Contraindications of green tea:
1. It is forbidden to drink tea for the first time: because tea is polluted by harmful substances such as pesticides in the process of planting and processing, there will always be some residues on the surface of tea leaves.
2. Avoid drinking tea on an empty stomach: Drinking tea on an empty stomach will dilute gastric juice and reduce digestive function, causing a large number of bad ingredients in tea to enter the bloodstream, and causing symptoms such as dizziness, palpitation, and limb weakness.
3. Drink less new tea: Due to the short storage time of new tea, it contains more unoxidized polyphenols, aldehydes, and alcohols, which have a strong stimulating effect on the human gastrointestinal mucosa and easily induce gastric diseases. New teas that are less than half a month old should be avoided.
4. People with a cold stomach should not drink too much, it will cause gastrointestinal discomfort. Nervous, insomniacs should not drink tea before going to bed. Breastfeeding women should also drink less tea, which has astringent effects on milk.
5. Avoid taking medicine with green tea and drink overnight tea. The tannic acid in green tea will combine with many drugs to form precipitation, hinder absorption and affect drug efficacy.
The efficacy of black tea:
Laoshan black tea is rich in riboflavin, folic acid, carotene, tocopherol, phylloquinone, and other nutrients, and also contains fluoride, the main component of food, which can relieve bad breath and protect teeth.
Carbohydrates and fats: The carbohydrates in the tea soaked in boiling water are mostly polysaccharides, and the polysaccharides that can be dissolved in boiling water only account for 4% to 5% of the soluble substances in the tea. Therefore, tea is a low-sugar beverage, while the lipid content of black tea is only 3%.
Vitamins: Laoshan black tea soup contains a lot of vitamin C, second only to green tea; drinking Laoshan black tea can relieve visual fatigue.
Contraindications of black tea:
1. Patients with stones and tumors should not drink. Stone patients are generally not allowed to drink black tea.
2. People with anemia, mental weakness, and insomnia should not drink it. The refreshing effect of black tea exacerbated their insomnia symptoms.
3. People who are usually sentimental or sensitive, sleep well, and are weak should not drink it. Because black tea has a very good refreshing effect.
4. People with hot stomachs should not drink. Because black tea is warm tea, it can warm the stomach.
5. People with thick tongue coating, bad breath, acne, and red eyes should not drink it. Black tea is "hot", people who are afraid of getting angry should not drink black tea.
6. Those who are taking medication should not drink it. Black tea will destroy the efficacy of the medicine.
7. Menstrual women should not drink it, because menstruation will consume a lot of iron in the body, and the tannic acid in black tea will hinder the body's absorption of iron in food.
8. Pregnant women should not drink it, because the caffeine in black tea will increase the load on the heart and kidneys of pregnant women, making pregnant women uncomfortable.
9. Women who are breastfeeding should not drink it, because the tannic acid in black tea affects the blood circulation of the breast, inhibits the secretion of milk, and affects the quality of breastfeeding.
10. Menopausal women should not drink, because the tea polyphenols in black tea may make menopausal women's hearts beat faster, resulting in poor sleep quality.
The above is the introduction to the efficacy and taboos of green tea and black tea. I hope the above sharing will be helpful to everyone!