Insights & Discussion
Tea supplements, especially green tea, significantly decrease fasting blood glucose and fasting insulin levels and reduce body weight in women with polycystic ovary syndrome.
The researchers conducted a systematic review and meta-analysis by searching published literature in different databases from 1985 to September 2021. The data from randomized controlled trials were extracted to assess the effectiveness of tea versus placebo in women with polycystic ovary syndrome. Weighted mean differences were pooled using a random-effects model. A total of six trials with 235 participants were included in this review.
The study resulted in finding that consumption of tea supplements improved body weight, fasting blood glucose, and fasting insulin more significantly when compared with a placebo. Notably, green tea was effective on body weight, fasting insulin, fasting blood glucose, and certain reproductive hormone indexes. The therapy was also found to be safely tolerated by the patients. It's important to note that tea had significant effects on fasting blood glucose and hormone levels in trials with intervention duration of 3 months or more. Differences were noticed among Asian and Caucasian PCOS patients regarding the effect of tea on weight and fasting insulin.
Discover Related Insights
Green tea supplementation can significantly reduce body weight in women with polycystic ovary syndrome, hence potentially beneficial in its clinical management.
2022 Nutrition Research Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis Colonetti L, Grande AJ, Toreti IR, Ceretta LB, da Rosa MI, Colonetti T
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The research carried out was a systematic review of randomized controlled trials that focused on women with polycystic ovary syndrome, examining the effects of green tea supplementation versus a placebo. Relevant studies were sourced from electronic databases such as MEDLINE via PubMed, EMBASE via Elsevier, Cochrane Library, LILACS via BVS, and Web of Science using specific terms related to the illness and green tea. Criteria for the evaluation included effects on body weight, fasting insulin, body mass index, body fat percentage, daily caloric intake, waist and hip circumference, and the waist/hip ratio.
Among the studies considered, there were a total of 169 women, with 85 allocated to the green tea group and 84 to the placebo group. It became apparent that there was a significant reduction in body weight for the group that received green tea supplementation. This leans towards the potential of green tea to be beneficial in the management of this syndrome.
Green tea and its chief bioactive component have the potential to improve certain female reproductive disorders such as endometriosis, polycystic ovary syndrome, and dysmenorrhea.
2021 Molecules Beneficial Effects of Green Tea Catechins on Female Reproductive Disorders: A Review Kamal DAM, Salamt N, Zaid SSM, Mokhtar MH
Review Article Endometriosis Female Reproductive Disorders Green Tea
The study reviews the beneficial effects of green tea and its major bioactive component on female reproductive disorders, focusing on endometriosis, polycystic ovary syndrome (PCOS), and dysmenorrhea. The research highlights the role of catechins, phenolic compounds found in tea, which have been known for their health benefits due to their high antioxidative properties. The green tea or its derivative works on endometriosis through anti-angiogenic, anti-fibrotic, anti-proliferative, and proapoptotic mechanisms.
In the discussion of results, it was found that green tea not only enhances ovulation and reduces cyst formation in PCOS, but it also ameliorates generalised hyperalgesia, reduces plasma corticosterone levels, and mitigates uterine contractility in dysmenorrhea. Despite the promising findings, the study acknowledges the need for more comprehensive clinical trials to fully translate these findings into clinical practice.
Cinnamon supplementation may significantly enhance metabolic status in women with polycicstic ovary syndrome, notably improving high-density lipoprotein and insulin sensitivity, and decreasing low-density lipoprotein, triglyceride, and blood glucose levels.
2021 Journal of Ovarian Research Mechanistic and therapeutic insight into the effects of cinnamon in polycystic ovary syndrome: a systematic review Maleki V, Faghfouri AH, Tabrizi FPF, Moludi J, Saleh-Ghadimi S, Jafari-Vayghan H, et al.
Systematic Review Blood Sugar Ceylon Cinnamon HDL-C
The systematic review employed a PICO framework where the population was subjects with polycystic ovary syndrome (PCOS), the intervention was oral cinnamon supplement, the comparison group was either a control or a placebo group, and the outcome measured were changes in inflammatory, oxidative stress, lipid profile, glycemic, hormonal and anthropometric parameters, and ovarian function. To gather relevant research studies, databases including PubMed, Scopus, EMBASE, ProQuest, and Google Scholar were searched right from their inception until January 2020 using specific, relevant keywords. Out of the initial 266 studies found, only nine met the criteria for evaluation. The types of studies considered for this review included all clinical trials, animal studies, and english-language journal studies.
The results showed a promising improvement in metabolic status in PCOS patients with cinnamon supplementation. This was shown through increased high-density lipoprotein and insulin sensitivity, and a decrease in low-density lipoprotein, triglyceride, and blood glucose levels in these patients. However, the impact of cinnamon on body weight and body mass index was inconsistent across the studies. Similarly, while the studies showed improved results regarding the effects of cinnamon on oxidative stress and ovarian function, the specific mechanisms behind these effects still need to be fully elucidated. Future studies should focus on observing clinical changes after cinnamon supplementation in PCOS through clinical trials with higher doses of cinnamon and a longer duration of intervention.
Green tea supplementation significantly lowers fasting glucose levels but does not significantly affect fasting insulin and haemoglobin A1c values.
2020 Nutrition & Metabolism Effects of green tea consumption on glycemic control: a systematic review and meta-analysis of randomized controlled trials Xu R, Bai Y, Yang K, Chen G
Systematic Review Blood Sugar Green Tea Type 2 Diabetes
The researchers performed a systematic review and meta-analysis of randomized control trials which examined the effect of green tea on glycemic control. Using online databases like PubMed, Embase, and Cochrane Library, they identified relevant trials up until February 2020. They then employed a random-effects model in order to estimate the weighted mean difference.
In the discussion of the results, it was found that twenty-seven trials, including 2194 subjects, were part of the meta-analysis. The collected data indicated that green tea lowered fasting blood glucose levels significantly. However, the same was not observed for fasting insulin and HbA1c values, which remained relatively unchanged despite green tea consumption. Moreover, substantial differences were noted in the range of responses, indicating significant heterogeneity, especially for fasting insulin levels. Despite these discrepancies, the short-term trials collectively demonstrated the beneficial effect of green tea supplementation in reducing fasting glucose levels.
Coffee consumption, in the long term, improves glucose metabolism but may cause unfavourable acute effects.
2019 Journal of Traditional and Complementary Medicine Effects of coffee consumption on glucose metabolism: A systematic review of clinical trials Reis CEG, Dórea JG, da Costa THM
Systematic Review Blood Sugar Glucose Metabolism Insulin
Researchers undertook a systematic review to evaluate the impact of coffee consumption on glucose metabolism. They scanned two electronic databases, PubMed and Web of Science, for relevant studies published till September 2017. After thorough scrutiny, eight clinical trials involving 247 participants were earmarked for analysis. These trials were divided into short-term (1-3 hours) and long-term (2-16 weeks) studies for distinct evaluation. The participants' characteristics, major discoveries, and study quality were all meticulously noted and analysed.
The initial short-term studies revealed that consumption of caffeinated coffee might lead to an escalation in the area under the curve for the glucose response, an immediate effect. Conversely, long-term studies suggested that caffeinated coffee might contribute to the enhancement of glycaemic metabolism over time by reducing the glucose curve and bolstering the insulin response. Despite the immediate short-term effects, an overall positive long-term impact on glucose metabolism was reported.
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