1. Reduce fat and lose weight: Black tea is rich in polyphenols and other ingredients, which can effectively inhibit the synthesis and absorption of fat and promote the metabolism of fat, thus achieving the effect of reducing fat and losing weight.

2. Anti-cancer and anti-cancer: Black tea contains a lot of tea polyphenols, which has a strong antioxidant effect and can effectively inhibit the growth and spread of cancer cells, thus achieving the effect of preventing and treating cancer.

3. Protect the liver: Black tea contains a variety of bioactive substances, which can enhance the detoxification function of the liver and help protect the health of the liver.

4. Anti-aging: Polyphenols and other components in black tea can inhibit the generation and destruction of free radicals, protect body cells and help delay aging.

However, for hair, black tea has some taboos and disadvantages. First of all, black tea contains some ingredients that are irritating to hair and scalp, such as caffeine and theophylline. Excessive drinking may damage the health of hair and scalp. Secondly, theophylline in black tea will make hair greasy, which is not suitable for people with oily hair. In addition, excessive drinking of black tea may also lead to insufficient water, aggravating the situation of dry and broken hair. Therefore, when the hair needs to drink black tea, it is necessary to drink it in moderation and pay attention to keeping the scalp and hair healthy.