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Consuming 2-3 cups of coffee daily can help prevent cardiovascular disease and drinking at least 3 cups of green tea has similar benefits.
In this review, researchers examined the effects of habitual coffee and tea consumption on cardiovascular disease (CVD) prevention. Specifically, they studied the association between 2-3 cups of coffee or tea consumed daily and their beneficial effects on metabolic syndrome, including hypertension and diabetes mellitus, focusing on how these popularly consumed beverages might affect lipid levels.
The analysis of findings drew a correlation between moderate coffee intake and a reduced risk of several cardiovascular conditions, such as coronary heart disease, heart failure, arrhythmia, stroke, and CVD, in addition to lowering mortality from all causes. It was also noted that the benefits extended to higher tea consumption as well, particularly in the case of green tea, where it led to improved survival rates in population-based studies.
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Higher coffee consumption, specifically 3-4 cups daily, is associated with a 21% lower risk of stroke, with no further reductions with increased intake.
2021 Journal of Stroke and Cerebrovascular Diseases Coffee Consumption and Stroke Risk: Evidence from a Systematic Review and Meta-Analysis of more than 2.4 Million Men and Women Shao C, Tang H, Wang X, He J
Systematic Review Coffee Stroke Stroke Risk
The research utilized a systematic review and meta-analysis approach to investigate the link between coffee consumption and stroke risk. Random-effects models were employed to compile relative risk estimates. The assessment was structured to compare the highest and lowest categories of coffee consumption and utilized a one-stage robust error meta-regression model for stroke risk assessment. The study incorporated 21 separate studies which in total included over 2.4 million participants.
The findings suggest a significant inverse connection between coffee consumption and the risk of stroke. According to the pooled relative risk analysis, the highest versus the lowest categories of coffee consumption showed a decrease in stroke risk. There seems to be a nonlinear (U-shaped) relationship between stroke risk and coffee consumption, with the lowest risk (21% lower) associated with consuming 3-4 cups of coffee per day. Sensitivity analysis suggested the influence of each individual data set on the overall result wasn't significant, and while some evidence of publication bias was witnessed, additional analysis established that potential bias didn't impact the findings noticeably.
Regular coffee consumption, due to its bioactive compounds, may have protective effects against chronic disorders and certain neurodegenerative conditions.
2020 International Journal of Molecular Sciences Neuroprotective Effects of Coffee Bioactive Compounds: A Review Socała K, Szopa A, Serefko A, Poleszak E, Wlaź P
Review Article Alzheimer's Disease Cardiovascular Disease Coffee
The paper evaluates the neuroprotective potential of the main bioactive elements in coffee: caffeine, chlorogenic acid, caffeic acid, trigonelline, kahweol, and cafestol. The analysis is focused on the coffee beverage as a complex mixture of these bioactive compounds. The comprehensive study includes in vitro and in vivo preclinical tests to determine the specific health benefits each of these compounds can offer.
The results indicate that regular coffee intake may have defensive effects against a variety of enduring disorders; including cardiovascular disease, type 2 diabetes, obesity, and some forms of cancer. Additionally, an interesting correlation is found between coffee consumption and a lower risk of developing certain neurodegenerative conditions such as Alzheimer's disease, Parkinson's disease, and dementia. The study also highlights that regular coffee intake could possibly lower the risk of stroke. However, the study mentions that the mechanisms enabling these effects are yet to be fully understood.
Coffee's bioactive compounds may exhibit various health benefits such as antioxidant and anti-inflammatory properties on the digestive tract and stimulating effects on motor function.
2020 Nutrients Effects of Coffee and Its Components on the Gastrointestinal Tract and the Brain–Gut Axis Iriondo-DeHond A, Uranga JA, del Castillo MD, Abalo R
Review Article Anti-Inflammatory Antioxidant Coffee
The methodology involved a narrative review of the impact of coffee; its by-products; and its bioactive components on the gastrointestinal system and the brain-gut axis. The gastrointestinal mucosa's reactions, mainly involving permeability, secretion, and proliferation, the neural and non-neural elements of the gut wall contributing to its motor function, and the brain-gut connection were all elements of critique and consideration.
The results from the in vitro, in vivo, and epidemiological studies demonstrated that coffee induces various effects on the digestive system. For instance, it might act as an antioxidant, have anti-inflammatory effects, and act against cell overgrowth in the mucosa. In addition, coffee seems to promote motor functions in the gastrointestinal tract's external muscle layers. Nonetheless, despite these affirmed possible effects, much about coffee's accurate and detailed influence remains largely unexplored.
Coffee, like many fruits and vegetables, activates a cellular response that boosts antioxidants and repair enzymes, which contributes to a lower risk of several diseases.
2020 Nutrients Health Effects of Coffee: Mechanism Unraveled? Kolb H, Kempf K, Martin S
Theoretical Article Antioxidant Coffee
The research paper proposes a new perspective on the health benefits of habitual coffee consumption. Instead of focusing on individual elements in coffee, the study compares coffee as a whole, acting as a plant food, with the advantageous properties of many vegetables and fruits. By linking coffee, vegetables and fruits, researchers identified a common mechanism that promotes health - the activation of an adaptive cellular response which leads to an upsurge of proteins involved in cell protection such as antioxidant, detoxifying and repair enzymes. It was also noted that this response hinges on the activation of the Nuclear factor erythroid 2-related factor-2 (Nrf2) system by phenolic phytochemicals, leading to the expression of cell defense genes.
The discussion of the paper's results reveals that coffee plays a significant role in health promotion, the main reason being that it is the primary dietary source of phenolic acids and polyphenols in the developed world. Additionally, a supportive function might be associated with the modulation of the gut microbiota by non-digested prebiotic constituents of coffee. Conclusively, the paper suggests that coffee uses similar health promotion pathways as other vegetables and fruits, and that coffee beans could be seen as healthy vegetable food and a leading supplier of dietary phenolic phytochemicals.
Green coffee supplementation significantly decreases fasting blood sugar, insulin, and triglycerides while boosting high-density lipoprotein levels.
2020 Journal of Diabetes & Metabolic Disorders The effect of green coffee extract supplementation on cardio metabolic risk factors: a systematic review and meta-analysis of randomized controlled trials Morvaridi M, Rayyani E, Jaafari M, Khiabani A, Rahimlou M
Systematic Review Blood Sugar Coffee
In methodology, a comprehensive literature review was carried out across PubMed, Embase, Scopus, and the Web of Science databases until October 2019. The objective was to scrutinize all randomized controlled trials of the impact of green coffee supplementation on various cardio metabolic risk factors in adults. These risk factors included fasting blood sugar, insulin, triglycerides, high and low-density lipoproteins and C-reactive protein. Data was then extracted from the relevant studies for analysis.
From the selected 27 studies for final analysis, the pooled results depicted that green coffee supplementation had a significant effect in reducing fasting blood sugar, insulin, and triglyceride levels. In addition, it was found to increase the levels of high-density lipoprotein. Conversely, it was determined that the supplementation did not lead to any notable changes in the Homeostatic Model Assessment for Insulin Resistance, low-density lipoprotein and C-reactive protein levels.
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