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There are predominant polyphenols in green tea that have antioxidant activity. Scientists think that These polyphenols, especially EGCG and ECG, contain free radicals, which may protect cells from DNA damage caused by reactive oxygen species.They also have the ability to inhibit the proliferation of body cells, protect against damage caused by ultraviolet (UV) radiation, and enhance immune system function. Additionally, green tea has been shown to activate enzymes responsible for detoxification, such as glutathione S-transferase and quinone reductase, which in turn help protect against tumor development. Dr, David Servan-Schreiber, MD, PhD, got cancer and recovered after many times of treatment. So, he decided to learn everything that he could about a lifestyle by which he can prevent and fight cancer. After 25 years, he knew that he had the way to fight and prevent cancer in his book, Anticancer:
The first food that he mentioned in his book is green tea. After that he mentions the spice turmeric and then mushrooms. Consequently, the first section is called “Green Tea Blocks Tissue Invasion and angiogenesis.” Studies that link tea to cancer prevention. According to many studies, tea polyphenols have been found in animal studies to inhibit the formation of cancer cells at different organs, including the skin, lung, liver, esophagus, stomach, small intestine, and mammary gland. On the other hand, the results of human studies have been inconclusive.
Furthermore, the participants in the first group had a fewer increase in lesion size (3%) than in the placebo group (7%). On the other hand, there was a second trial involved 39 people with high-risk premalignant oral lesions. Some of them received 500 mg of green tea per square meter of body surface area (mg/m2), and the others received placebo three times daily for 12 weeks. At the end of the trial, there were no differences in lesion responses between the groups.
Tea is recognized as safe by the Food and Drug Administration (FDA). The adverse effects reported in some studies included, dizziness, headache, excess intestinal gas, nausea, heartburn, stomach ache, abdominal pain, and muscle pain. Many scientists think that The tea as any other caffeinated beverages (such as coffee and colas) may potentially cause adverse effects, including tachycardia, insomnia, uncomfort, nervousness, abdominal pain, nausea, vomiting, diarrhea, and diuresis. However, there is not enough evidences of health risks for adults who consume moderate amounts of caffeine (300 to 400 mg a day). A review was held by Health Canada suggested that moderate amount of caffeine intakes (up to 400 mg per day or 6 mg per kilogram body weight) was not associated with adverse effects in healthy adults.
Additionally, The amount of caffeine content is higher in black teas (64 to 112 mg per 8 FL Oz serving) followed by Oolong tea (29 to 53 mg per 8 FL Oz serving). But, Green and white teas contain slightly less caffeine (24 to 39 mg per 8 FL Oz serving).Generally, caffeine doses of less than 3.0 mg per kg body weight have no adverse effects on kids. However, Higher doses have a bad impact in some behavioral effects, such as nervousness, anxiety as well as sleep disturbances.
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