What Advantages Does Green Tea Have For Your Health?

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What is green tea?

One of the most widely favored drinks consumed worldwide is Green tea. Green, black, or oolong tea made from the “Camellia sinensis” plant is enjoyed throughout the world. But out of all of these, green tea drinking has been found to have the greatest effects on human health.

In the seventeenth century, India sent the first green tea to Japan. Around 2.5 million tones of tea leaves are reportedly produced annually around the world, 20% of which are green teas that are primarily consumed in Asia, some regions of North Africa, the United States, and Europe.

Black tea and green tea go via various manufacturing processes. Freshly collected leaves are steamed as soon as possible to prevent fermentation, creating a dry, dependable green tea. The subsequent rolling and drying operations enable the tea to keep its green color because the steaming process kills the enzymes that degrade the color pigments in the leaves. These procedures maintain the health-promoting qualities of natural polyphenols. The polyphenol chemicals (catechins) in green tea are dimerized to generate a variety of theaflavins as it is fermented to Oolong and then to black tea, hence these teas may have various biological functions.

Green tea composition

The chemical composition of green tea is complex: proteins (15-20% dry weight), whose enzymes constitute an important fraction; amino acids (1-4% dry weight) such as theanine or 5-N-ethylglutamine, glutamic acid, tryptophan, glycine, serine, aspartic acid, tyrosine, valine, leucine, threonine, arginine, and lysine; carbohydrates (5-7% dry weight) such as cellulose, pectins, glucose, fructose, and sucrose; minerals and trace elements (5% dry weight) such as calcium, magnesium, chromium, manganese, iron, copper, zinc, molybdenum, selenium, sodium, phosphorus, cobalt, strontium, nickel, potassium, fluorine, and aluminum; and trace amounts of lipids (linoleic and α-linolenic acids), sterols (stigmasterol), vitamins (B, C, E), xanthic bases (caffeine, theophylline), pigments (chlorophyll, carotenoids), and volatile compounds (aldehydes, alcohols, esters, lactones, hydrocarbons).

Green tea
Green Tea

Health benefits of green tea

Following are the most prominent benefits of green tea.

Green tea affects the absorption of metal ions

Tea catechins may impact iron absorption, especially in populations at risk for iron deficiency, although it is unclear how they may affect other ions. Long-term consumption of green tea has little effect on the apparent absorption of copper, but it decreases zinc absorption and enhances manganese absorption. The plasma concentration of these ions is unaffected by catechin consumption. Because flavonoids interact with a variety of metal ions, green tea catechins may have an impact on ion absorption and metabolism.

 Effect of Green tea on drug-metabolizing enzyme

Green tea consumption for an extended period enhances UDP-glucuronosyl transferase activity, and after absorption, catechins are metabolized by numerous organ-specific drug-metabolizing enzymes. As a result, it is hypothesized that the enhanced glucuronidation caused by the stimulation of UDP-glucuronosyl transferase contributes to green tea’s anticarcinogenic action by promoting the conversion of chemical carcinogens into inert byproducts that are easily eliminated.

Effects of Green tea on antioxidant markers and oxidative stress

A well-liked nutraceutical used as an antioxidant is green tea. Antioxidants are substances that defend cells from reactive oxygen species, including singlet oxygen, superoxide, peroxyl, hydroxyl, and peroxynitrite radicals. Oxidative stress, which causes cellular damage, is the outcome of an imbalance between antioxidants and reactive oxygen species. It is believed that catechins, in addition to antioxidant vitamins (such as vitamins C and E) and enzymes (such as catalase and superoxide dismutase), aid in the body’s overall antioxidant defense system.

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Green tea catechins have been shown in studies to improve total plasma antioxidant activity. Superoxide dismutase activity in serum and catalase expression in the aorta are both increased by the consumption of green tea extracts; these enzymes are important for cellular defense against reactive oxygen species. Nitric oxide plasma concentration is reduced, which combines this activity with direct action on oxygen species. After consuming green tea, malondialdehyde, a sign of oxidative stress, also drops. These findings imply that catechins may have an impact either directly (antioxidant) or indirectly (increased activity or expression).

Effects of green tea on carbohydrate metabolism

Some research has revealed that those who drink green tea have a lower chance of developing type 2 diabetes than those who don’t. Randomized control studies discovered a link between drinking green tea and lower fasting blood sugar and insulin levels.

Green tea consumption as part of a Mediterranean-style diet was also linked in a 2017 review of dietary polyphenol studies to a lower risk of type 2 diabetes. Other research, however, has found no connection at all between drinking tea and diabetes.

Effects of Green tea on obesity

Recent findings from human research suggest that drinking green tea and green tea extracts may increase postprandial thermogenesis and fat oxidation, which may help reduce body weight, primarily body fat. In a cross-over, randomized, double-blind, placebo-controlled trial, six obese men received 300 mg of EGCG daily for two days. Energy expenditure and substrate oxidation variations while fasting and after meals were evaluated. Although during the first postprandial monitoring phase, respiratory quotient values were considerably lower with EGCG therapy compared to the placebo, resting energy expenditure did not differ significantly between EGCG and placebo treatments. According to these results, EGCG may boost fat oxidation in males and so help explain why green tea has an anti-obesity impact. To determine the ideal dose, additional research with larger sample size and a wider range of age and body mass index is necessary.

Active memory

According to certain studies, green tea may improve one’s working memory and other cognitive abilities. Green tea may have promise in the treatment of cognitive deficits linked to neuropsychiatric disorders like dementia, according to the double-blind volunteer trial.

Skin inflammation conditions

Anti-inflammatory effects are found in green tea. a summary of clinical research on people Green tea and its main ingredient, epigallocatechin-3-gallate (EGCG), has been shown to have demonstrable anti-inflammatory benefits in cellular and animal investigations, according to Trusted Source.

This was supported by a reliable source that uses tea extract in cosmetics. Researchers found that topical application of solutions containing tea extracts improved anti-inflammatory effects. They also discovered that the skin’s microcirculation in the damaged areas had improved.

Green Tea
Green Tea

Side effects of Green tea

Green tea extract’s cytotoxic EGCG can cause acute cytotoxicity in liver cells, the body’s main metabolic organ when consumed in greater quantities. According to a different study, drinking more green tea may result in oxidative DNA damage to the liver and pancreas. In pancreatic cells in vivo, EGCG works as a pro-oxidant rather than an antioxidant, according to Yun et al. As a result, excessive consumption of green tea may make it more difficult for diabetic animals to regulate hyperglycemia.


Green tea has positive health impacts, according to laboratory studies. Future study is required to determine the precise quantity of health benefits, establish the safe range of tea consumption associated, and clarify the mechanisms of action because the human clinical data is currently limited. A deeper knowledge of how green tea interacts with endogenous systems and other external elements will be possible with the development of more precise, sensitive, and representative approaches with more representative models.

Only carefully planned observational epidemiological research and intervention trials will be able to draw definitive findings about the preventive impact of green tea. Future studies in this area will be facilitated by the creation of biomarkers for green tea consumption and molecular markers for its biological effects.

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