1. Refreshing: Caffeine and theophylline in tea can stimulate the nervous system, make people refreshed and improve their alertness.

2. Improve digestion: Tea polyphenols, volatile oil and other substances in tea help promote gastrointestinal peristalsis, increase gastric acid secretion, and improve symptoms such as indigestion and loss of appetite.

3. Prevention and treatment of cardiovascular diseases: Tea polyphenols in tea can reduce blood fat, resist oxidation and help prevent cardiovascular diseases.

4. Antibacterial and moth-proofing: Tea polyphenols and theophylline in tea have antibacterial effects, which can prevent oral cavity and bad breath.

Functional taboo of kung fu black tea;

1. Drinking tea too late: Drinking tea at night will stimulate the nervous system and lead to insomnia and other problems.

2. Tea is too thick: making tea too thick will lead to too much tea gas, stimulate the digestive system and cause gastrointestinal discomfort.

3. Digestive system diseases: patients with gastritis, ulcers and other diseases should drink less tea, so as not to stimulate the gastric mucosa and aggravate the condition.

4. Pregnancy and lactation: Because caffeine and theophylline in tea can be transmitted to fetus or baby through placenta or breast milk, women during pregnancy and lactation should drink less tea or avoid drinking tea.