Drinking tea has many benefits, which is true for almost everyone. However, for some individuals, due to certain physical conditions, drinking tea can have both benefits and adverse effects. Weighing the pros and cons, it might be better for them to avoid tea.
1. People with constipation.
Because the polyphenols in tea have an astringent effect on the gastrointestinal mucosa, which affects the digestion and absorption of food, leading to dry, hardened stools, causing or worsening constipation. 2. People with neurasthenia or insomnia.
Because the caffeine in tea has a significant stimulating effect on the central nervous system, drinking tea, especially strong tea, can put the brain in a state of over-excitement without allowing it to rest. 3. People with anemia.
Because the tannic acid in tea can combine with iron in food to form precipitates that the human body cannot absorb. 4. People with calcium deficiency or fractures.
Because the alkaloids in tea can inhibit the absorption of calcium by the duodenum. At the same time, they can promote the excretion of calcium in urine, causing the body to lose more calcium than it takes in, leading to calcium deficiency, osteoporosis, and making it difficult for fractures to heal. 5. People with stomach ulcers.
Because the human stomach contains a phosphodiesterase that inhibits gastric acid secretion by gastric wall cells, while the theophylline in tea can reduce the activity of this phosphodiesterase, causing gastric wall cells to secrete large amounts of gastric acid. 6. People with gout.
Because the tannic acid in tea can worsen the patient's condition, so drinking tea is not advisable, and drinking tea that has been steeped for too long is even less advisable. 7. People with high blood pressure or heart problems.
Because the caffeine in tea has a stimulating effect on the heart, and this excitation process affects the body's physiological activities, increasing certain basal metabolic rates. 8. People with urinary system stones.