1. Help to regulate blood pressure and blood sugar and prevent cardiovascular diseases.

2. Keep fresh, improve alertness and attention, and relieve fatigue.

3. Strong antioxidant effect, which can inhibit and repair cell damage and prevent cancer.

4. Improve breath, reduce oral bacteria, and prevent dental caries and bad breath.

The disadvantages of drinking green tea:

1. Change sleep. Because tea contains caffeine, it will stimulate the nervous system and affect the quality of sleep.

2. It will affect the human body's absorption of iron, especially pregnant women and children who need more iron in medicine.

3. Tea may contain a lot of heavy metals, which has adverse effects on human health.

4. Causing stomach discomfort, excessive drinking will cause gastrointestinal discomfort, diarrhea, nausea and other symptoms.

To sum up, drinking green tea in moderation is good for your health, but you should also pay attention to the control of the amount. Especially for some people with moderate and severe gastrointestinal problems, it is not suitable for drinking a lot of green tea. Moreover, you should choose high-quality and pollution-free green tea to drink, so as to avoid damaging your health because it contains harmful substances such as heavy metals.