1. Strong tea greatly reduces milk and affects breast-feeding babies.

2. Strong tea promotes gastric acid secretion. Make the stomach secrete a lot of gastric acid, forming gastric ulcer and intestinal ulcer.

3. Excessive drinking of strong tea will lead to "tea drunkenness", palpitation, fatigue, irritability and general malaise.

Caffeine can inhibit the absorption of calcium and excrete calcium from urine. Osteoporosis occurs when calcium is lost.

Drinking strong tea often may lead to constipation. Tea polyphenols in tea have a strong convergence effect on gastrointestinal mucosa. Strong tea contains high content of tea polyphenols, which has stronger astringency, and will slow down the contraction of stomach and peristalsis of intestine, thus affecting the digestion and absorption of food, easily causing dry stool and even constipation.

6. Drinking more strong tea will hurt your stomach. After drinking strong tea, it will dilute the gastric juice, reduce the concentration of gastric juice, make the gastric juice unable to digest food normally, and have symptoms such as indigestion, abdominal distension and abdominal pain. Poor stomach function may even cause duodenal ulcer.

7. Strong tea promotes insulin secretion and hypoglycemia will occur.

8. Overexciting the brain, especially at night, will seriously affect sleep.

9. Strong tea has high fluorine content, which is easy to cause dental caries and make teeth grow a layer of glaze black.

10. Prompt the heartbeat to be too fast and the blood flow to be accelerated, leading to arrhythmia or tachycardia.