1. Constipated person

People with constipation are not suitable for drinking tea, because their intestines are dry when they are constipated, so they are suitable for eating some food that can moisten the intestines and relieve constipation. Some ingredients in the tea have a certain astringent effect on the gastrointestinal mucosa, thus affecting the digestion and absorption of food, making the stool dry, causing constipation or aggravation.

2. People with neurasthenia and insomnia

Because the caffeine in tea has an obvious excitatory effect on the central nervous system of the human body, drinking tea, especially strong tea, will make the human brain in an overexcited state without rest.

3. Anemic person

Because the tannic acid in tea will make the iron in food form sediment that is not absorbed by human body.

4. People with calcium deficiency or fracture

Because the alkaloids in tea will inhibit the absorption of calcium in the duodenum. At the same time, it can also promote the excretion of calcium in the urine, make the calcium in the body less and more, lead to calcium deficiency and osteoporosis, and make it difficult to recover from fractures.

5. People with gastric ulcer

Because there is a phosphodiesterase in the human stomach that can inhibit the secretion of gastric acid by gastric parietal cells, and theophylline in tea will reduce the activity of phosphodiesterase and make gastric parietal cells secrete a large amount of gastric acid.

6. Gout patient

Because the tannic acid in the tea will aggravate the patient's condition, it is not suitable to drink tea, especially tea that has been soaked for too long.

7. Patients with hypertension or heart disease

Because caffeine in tea has a strong cardiac excitatory effect on the human body, this excitatory process will affect the physiological activities of the body and improve some basic metabolism.