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Green tea supplementation improves total antioxidant capacity and impacts oxidative stress based on dose levels in adults.
The research's methodology involved a systematic search of research materials published in English language up to 21 August 2021. Recognized online databases such as Scopus, PubMed, Embase, and ISI Web of Science were utilized with the appropriate keywords. The study focused on randomized controlled trials that evaluated green tea supplementation, and its relationship with malondialdehyde and total antioxidant capacity in adults. A random-effects model quantified the difference, and the researchers carried out meta-regression and non-linear dose-response analyses to investigate the association between the quantity of green tea consumed and the duration of the intervention.
The research analysed the results obtained from sixteen randomized controlled trials, which amount to seventeen study arms comprising a total of 760 participants. The study found that green tea supplementation did have significant effects on total antioxidant capacity, and these effects were chiefly linked to gender and body mass index. However, the results showed that these effects were not significant in cases of low-dose supplementation and obese individuals. On the other hand, no relationship was found between malondialdehyde and green tea supplementation in any subgroup. Nonetheless, meta-regression analyses indicated an inverse linear connection between the change in MDA and the dosage of green tea.
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Green tea and its component EGCG, demonstrate potential as a treatment for endometriosis by inhibiting growth, invasion, adhesion and angiogenesis.
2021 Critical Reviews in Food Science and Nutrition Therapeutic effects of green tea on endometriosis Chen X, Man GCW, Hung SW, Zhang T, Fung LWY, Cheung CW, et al.
Review Article Anti-Inflammatory Antioxidant EGCG
The main research methodology of this work is a narrative review. The paper comprehensively collects and reviews various preclinical studies that propose the use of green tea as a potential treatment for endometriosis. These studies explore the diverse biological properties and activities of green tea and its major bioactive component, (-)-epigallocatechin gallate, including anti-angiogenic, anti-proliferation, anti-metastasis, and apoptosis induction functions. Different potential mechanisms used by green tea to inhibit the growth of endometriosis are considered, such as its effects on inflammation, oxidative stress, invasion, adhesion, and apoptosis.
The discussion of the reviewed data highlights the potential therapeutic effects of green tea acting on different molecular and cellular mechanisms in endometriosis. The researchers keenly discussed how green tea exhibited an inhibitory effect on the disease through multiple avenues, including reducing inflammation and oxidative stress, preventing tumor invasion and adhesion, promoting apoptosis (cell death), and limiting angiogenesis (the development of new blood vessels) - all these factors contribute to the growth and progression of endometriosis. The discussion elaborates on the significant roles and wider implications of these processes in understanding and potentially treating endometriosis.
Green tea therapy can significantly improve rheumatoid arthritis symptoms, correlating with changes in specific circulating serum molecules, miR-125b and miR-146a.
2021 Journal of Herbal Medicine Circulating microRNAs expression as predictors of clinical response in rheumatoid arthritis patients treated with green tea Al-Rawaf HA, Alghadir AH, Gabr SA
Clinical Study Antioxidant Green Tea
In this study, 100 female patients suffering from rheumatoid arthritis and 50 healthy female subjects were examined. Patients with rheumatoid arthritis underwent green tea therapy, where they consumed 5 cups of green tea daily, delivering a total of 1230 mg of catechins, over a span of 24 weeks. During this time, researchers used real-time PCR analysis to measure the levels of miR-146a and miR-125 b in the patients' peripheral blood mononuclear cells. These cells were isolated from the subjects at three distinct stages: the starting point (baseline), after 12 weeks, and finally after 24 weeks of the treatment.
The observations revealed a notable increase in the level of circulating miR-125 b and decrease in miR-146 expression, and these shifts were seen to correspond positively with measures of disease activity and pain intensity in the patients after 24 weeks of the green tea therapy. Also of note was that the levels of miR-146a and miR-125b could accurately predict the clinical response to green tea therapy in 65% of the rheumatoid arthritis patients. Discrepancies in miR-146a and miR-125b levels following green tea therapy suggests that they may be attributed to the joint protective, antioxidant, and anti-inflammatory effects of green tea. It was therefore proposed that both miR-146a and miR-125b could potentially serve as diagnostic, therapeutic, and predictive biomarkers in green tea therapy and may even have valuable application in related non-drug rheumatoid arthritis therapy.
There is a notable gap in scientific research on the potential health benefits and antioxidant activity of matcha tea compared to green tea.
2021 Applied Sciences Retrospecting the Antioxidant Activity of Japanese Matcha Green Tea–Lack of Enthusiasm? Sivanesan I, Gopal J, Muthu M, Chun S, Oh JW
Review Article Antioxidant Green Tea Matcha
The strategy used in this study was a literature review that critically evaluated existing research publications on both green tea and matcha tea. This focused primarily on the concentration and potential benefits of their bioactive components and polyphenols. Key areas of comparison included antioxidant activity and potential health benefits in each tea variety. The comparison was made simultaneously considering the scarcity of studies specifically focused on matcha tea.
The discussion of the results became apparent that there is a significant discrepancy in the volume of scientific literature available on green tea compared to that on matcha. Despite matcha tea being rich in bioactive components and polyphenols, the lack of research has left its potential health benefits and antioxidant activity largely unexplored. This discrepancy emphasizes the immediate need to address the gap between public usage and awareness of matcha tea's benefits with scientific approval and understanding.
Green tea, coffee, wine, and curry have beneficial health effects due to the polyphenols they contain, which possess both antioxidant and pro-oxidant properties.
2021 Molecules The Beneficial Effects of Principal Polyphenols from Green Tea, Coffee, Wine, and Curry on Obesity Ohishi T, Fukutomi R, Shoji Y, Goto S, Isemura M
Review Article Anti-Diabetic Anticancer Antioxidant
The research leverages epidemiological studies, clinical trials, cell-based studies and animal tests to examine the effects of green tea, coffee, wine, and curry -- and their key polyphenols -- on human health. The polyphenols investigated include epigallocatechin gallate in green tea, chlorogenic acid in coffee, resveratrol in wine, and curcumin in curry. The study concentrates on the workings of these polyphenols, primarily focusing on reactive oxygen species (ROS), and how they perform both anti- and pro-oxidant functions, fundamentally influencing different enzymes and factors with health contributions.
In the discussion of the results, it is mentioned that the anti-oxidative actions of these polyphenols assist in the scavenging of ROS and the downregulation of the nuclear factor-κB, yielding beneficial anti-inflammatory effects. Conversely, their pro-oxidant actions appear to elevate ROS production, encouraging the activation of 5'-AMP-activated protein kinase that regulates different enzymes and factors for health improvement. However, the exact mechanism of how these polyphenols exhibit either pro- or anti-oxidant effects remains unclear. Also, the research underscores that while many studies note their health benefits, some others show no positive effects on health conditions such as obesity, suggesting that outcomes could be influenced by various study factors.
Green tea and its compounds, especially catechins, may potentially prevent and treat osteoarthritis due to their potent antioxidant and anti-inflammatory properties.
2020 Longhua Chinese Medicine The possible role of green tea on osteoarthritis: a narrative report Barbalho SM, Goulart RA, Buglio DS, Araujo AC, Guiguer EL
Review Article Anti-Inflammatory Antioxidant Green Tea
The researchers performed an extensive review exploring the potential impact of green tea and its bioactive compounds, chiefly catechins, on osteoarthritis management. Their focus was on the anti-inflammatory and antioxidant abilities of these compounds. Based on the review, such compounds can quell inflammation by blocking various signaling pathways interconnected with inflammatory processes. Specifically, they have the potential to suppress the expression of several cytokines and enzymes related to inflammation.
In addition, green tea was noted for its property to neutralize free radicals, thus averting the formation of harmful reactive oxygen species and countering oxidative stress. While many conventional, non-surgical osteoarthritis therapies can lead to numerous adverse effects, the current review suggests that green tea could serve as a safer alternative. It may be a promising direction in the prevention and management of this chronic, painful, and inflammatory condition, which touches a significant number of people globally.
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