The human body mainly relies on its own immunity to resist foreign pathogens, which includes the immune function of blood and lymph system and the immune function of intestinal tract.
The immune function of haemolymph system is to recognize the pathogens invading human body through the formation of immune protein bodies, and then eliminate these pathogens by white blood cells and lymphocytes in the human body.
Modern research on tea has shown that drinking more tea can increase the number and activity of white blood cells and lymphocytes in human body.
In addition, tea drinking can promote the formation of interleukin-I in spleen lymph. Interleukin I is a kind of substance that can enhance human immunity, so its increase can improve the immune function of human body correspondingly.
The immunity of human intestinal tract is the fundamental reason to maintain the health of intestinal tract. The immunity of intestinal tract is closely related to the microorganisms. An adult’s digestive tract contains about 100 trillion bacteria of more than 100 species, some of which are beneficial and others are harmful.
Many domestic studies have proved that tea can kill harmful bacteria in the intestine, such as Vibrio cholerae, Staphylococcus aureus, Escherichia coli, Salmonella enteritidis and so on. Even if the concentration of tea soup is general, the active ingredients can inhibit the growth and reproduction of harmful bacteria.
On the other hand, there are many beneficial bacteria in the gut, such as bifidobacteria, which are particularly important. The number of bifidobacteria decreases with age. It can account for 95% of the total intestinal bacteria in infancy, 15% in youth, and only 5% in over 50 years old.
The reduction of beneficial bacteria will bring adverse effects on human body. It was found that drinking tea can increase the growth and reproduction of bifidobacteria. Therefore, on the one hand, tea drinking can inhibit or even eliminate harmful bacteria, on the other hand, it can promote the growth and reproduction of beneficial bacteria, which can improve the intestinal microbial structure, improve the intestinal immunity and enhance human health.
At present, the efficacy of tea in the treatment of dysentery has been confirmed in clinical practice. It is reported that the effect of the concentrated extract of green tea on dysentery is better than that of chemical drugs, and the duration of effect is longer.
In the experiment, after the treatment of dysentery with green tea, Shigella was inhibited 2-3 days, and the patient recovered completely from 5 to 10 days. Half a year later, re examination found that the patient still showed negative reaction, which proved that the effectiveness was relatively long.
The reason why tea can treat dysentery is that catechins (especially EGC and EGCG) have obvious inhibitory effect on pathogenic bacteria.
In the hospitals left over from the former Soviet Union, strong green tea decoction is still used for patients with intestinal diseases. It has both therapeutic and preventive effects, and can inhibit the proliferation of harmful bacteria for months.
Therefore, drink more tea, less sick, because the effective ingredients in tea can enhance human immunity, effectively resist the invasion of foreign pathogens. At the same time, the various components in tea also have good therapeutic and preventive effects on some diseases.