1. Antioxidant effect: Green tea is rich in antioxidants, which can protect the body from free radicals.

2. Lose weight: Catechin and caffeine in green tea can accelerate metabolism and help the body burn fat.

3. Improve cardiovascular and cerebrovascular health: Tea polyphenols in green tea can lower cholesterol and blood pressure and prevent cardiovascular and cerebrovascular diseases.

4. Improve immunity: Catechin in green tea has antibacterial effect and can enhance immunity.

The disadvantages of drinking green tea:

1. Caffeine in it can cause nervous excitement and insomnia.

Drinking too much green tea will increase the burden on the liver.

3. Green tea contains a small amount of heavy metals, such as aluminum and manganese. Excessive drinking may lead to heavy metal poisoning.

The benefits of drinking black tea:

1. Provide energy: Caffeine in black tea can provide energy needed by the body.

2. Improve cardiovascular and cerebrovascular health: Black tea contains polyphenols, which helps to lower cholesterol and blood pressure and prevent cardiovascular and cerebrovascular diseases.

3. Promote digestion: Tea tannins in black tea can promote digestion and help relieve stomach discomfort.

4. Antioxidant effect: Polyphenols in black tea have antioxidant effect, which can protect the body from free radicals.

The disadvantages of drinking black tea:

1. Drinking too much black tea will affect the absorption of calcium and increase the risk of cartilage damage.

Drinking black tea for a long time is easy to cause anemia, because it hinders the body's absorption of iron.

3. Excessive drinking of black tea will lead to excessive caffeine, causing headaches, palpitations, shaking hands and other problems.