Tea contains organic chemical components and inorganic mineral elements, among which there are many nutritional and medicinal components.

The main organic chemical components include: tea polyphenols, plant alkaloids, proteins, amino acids, vitamins, pectin, organic acids, lipopolysaccharides, sugars, enzymes, pigments, etc. The main inorganic mineral elements include: potassium, calcium, magnesium, cobalt, iron, manganese, aluminum, sodium, zinc, copper, nitrogen, phosphorus, fluorine, iodine, selenium, etc.

Green tea is the best for preventing gastric cancer, followed by black tea.

Tea has the following effects in preventing gastric cancer:

(1) Tea can directly kill tumor cells

Certain components in tea, especially the combined effects of caffeine, flavonoids, and tea polyphenols in green tea, have anti-cancer properties.

(2) Enhances immune function and nutrition

Tea contains many essential nutrients, such as protein, amino acids, carbohydrates, minerals, vitamins A, C, E, K, and trace elements like selenium and zinc. These not only supplement nutritional deficiencies but also improve the body's immunity.

(3) Helps eliminate harmful substances

Since ancient times, tea has been recorded to have certain effects, which have now been scientifically confirmed. Certain components in tea can detoxify, inactivate, and promote the excretion of toxic substances.

(4) Inhibits the synthesis of carcinogenic nitrosamines, especially when drinking green tea after meals.

(5) Counteracts the harm of alcohol and tobacco

Drinking tea can promote the excretion of alcohol through urine, inhibiting the carcinogenic effects of alcohol. The caffeine in tea also counteracts the harmful effects of smoke.

(6) Tea contains an aromatic oil

It can stimulate gastric juice secretion, remove accumulated dirt in the stomach, and reduce the occurrence of gastric cancer.