According to statistics, more than 20 laboratories in several countries have reported on the anti-cancer effects of tea extracts and tea polyphenols on different organs in animal experiments. A review has been conducted on the anti-cancer effects of tea [http://3tcha.com].
Using a tea infusion made from 1.25g of green tea with 100mL of boiling water as the sole beverage for mice can reduce chemically-induced lung tumors by 36% to 44%, and decrease tumor proliferation by 44% to 60%. Decaffeinated tea and black tea also show similar effects. Additionally, treating animals with green tea [http://3tcha.com] or black tea [http://3tcha.com] can reduce esophageal cancer, stomach cancer, or skin cancer in experimental animals by 70%.
Studies also indicate that feeding green tea [http://www.3tcha.com] or black tea [http://www.3tcha.com] at least two weeks before carcinogen treatment and continuing for one week after shows the best results. Epidemiological studies suggest that people who drink more tea have a lower risk of developing stomach cancer. Past reports indicating that tea consumption increases the incidence of esophageal cancer were due to drinking hot tea; drinking tea at normal temperatures can actually reduce the occurrence of esophageal cancer. Research on the effective dose of tea for cancer prevention indicates that when hamsters drink 2 to 3 cups of tea, the level of tea polyphenols in their blood reaches the effective concentration used in cancer experiments.
The anti-cancer mechanisms of tea [http://www.3tcha.com] include the following points:
① The antioxidant activity of tea polyphenols;
② Tea polyphenols inhibit the activity of enzymes (ornithine decarboxylase, protein kinase C, lipoxygenase, and cyclooxygenase) that promote tumor development;
③ Anti-tumor proliferation activity.
④ Enhancing immunity;
⑤ Tea polyphenols promote the activity of enzymes with anti-cancer properties (glutathione peroxidase, catalase, glutathione-S-transferase, NADPH-quinone oxidoreductase, uridine diphosphoglucuronosyl transferase, and methoxy-9-hydroxyisoquinoline D149-O-dealkylase).
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