1. Digestive system: drinking black tea after meals dilutes gastric juices, increasing the difficulty of digesting food in the stomach, which may cause flatulence, indigestion, constipation and so on.
2. Nervous system: black tea contains caffeine, long-term consumption is likely to lead to difficulty in falling asleep, insomnia and so on.
3. Urinary system: long-term consumption of black tea will increase the burden on the kidneys.
4. Moderate consumption of black tea is beneficial: it can reduce blood lipids, remove body fat, enhance the body's anti-coagulant ability, rich in vitamins and minerals, mainly for the people with elevated blood lipids and blood sugar, but it is not advisable to drink a lot of it for a long time.
Long-term consumption of black tea may cause harm to the body, but drinking in moderation is beneficial:
1. Digestive system: drinking black tea after meals to dilute gastric juices, increase the difficulty of digesting food in the stomach, which may cause flatulence, indigestion, constipation and so on.
2. Nervous system: black tea contains caffeine, long-term consumption is likely to lead to difficulty in falling asleep, insomnia and so on.
3. Urinary system: long-term consumption of black tea will increase the burden on the kidneys.
4. Moderate consumption of black tea is beneficial: it can reduce blood lipids, remove body fat, enhance the body's anti-coagulant ability, rich in vitamins and minerals, mainly for people with elevated blood lipids and blood sugar, but it is not advisable to drink a lot of it for a long time.
1. Lead pollution: black tea production process may be contaminated by soil, fertilizers and other environmental factors, resulting in tea containing lead. Long-term consumption of black tea containing lead will cause some harm to the human body.
2. Gastrointestinal tract irritation: black tea is irritating, and it may irritate the gastrointestinal tract when on an empty stomach, leading to symptoms such as bloating and diarrhea.
3. Pigmentation: black tea contains a large number of flavonoids and a variety of organic acids and other substances, long-term consumption will produce pigmentation, so that the skin becomes black.
4. Tea stains: black tea contains high levels of tea oxidase and polyphenol oxidase and other enzymes, long-term consumption will lead to yellow teeth and tea stains.
5. Dietary balance: long-term consumption of black tea may affect the dietary balance, which adversely affects human health.
Overall, moderate consumption of black tea is beneficial to the human body, but long-term consumption of excessive or unhygienic black tea can be harmful to the human body. It is recommended to drink high quality black tea purchased through regular channels, to control the amount of consumption, and to ensure a balanced diet.