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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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Heavy coffee consumption increases the risk of cardiovascular disease mortality in individuals with severe hypertension, while green tea consumption does not.
2023 Journal of the American Heart Association Coffee and Green Tea Consumption and Cardiovascular Disease Mortality Among People With and Without Hypertension Teramoto M, Yamagishi K, Muraki I, Tamakoshi A, Iso H
Cohort Study Cardiovascular Disease Coffee Green Tea
With the use of the Japan Collaborative Cohort Study, researchers assessed 18,609 participants, both male and female, aged between 40 to 79 years. These participants had varying blood pressure levels, categorized into optimal and normal BP, high-normal BP, and two stages of hypertension. They completed a questionnaire about their lifestyle, diet, and medical history, and underwent health examinations, which were followed up until 2009. The association of coffee and green tea consumption on cardiovascular disease mortality was then calculated using a Cox proportional hazard model.
It was found over an 18.9 year follow-up period that heavy coffee consumption was linked to increased risk of cardiovascular disease mortality among those suffering from the second to third grade of hypertension. In stark contrast, people with optimal and normal, high-normal blood pressure and first grade hypertension did not show such associations between coffee consumption and cardiovascular disease mortality. Interestingly, the risk of cardiovascular disease mortality was not found to be increased across any blood pressure categories in relation to green tea consumption.
Consumption of tea and coffee may possibly provide anti-inflammatory effects, contributing to reduced cardiovascular risk and mortality.
2023 Pharmacological Research Coffee or tea: Anti-inflammatory properties in the context of atherosclerotic cardiovascular disease prevention Surma S, Sahebkar A, Banach M
Review Article Anti-Inflammatory Cardiovascular Disease Coffee
The methodology of this narrative review examined the potential anti-inflammatory properties of consuming tea and coffee as a factor in reducing the risk of cardiovascular disease. This was done by analyzing a plethora of studies and meta-analyses that explored the impact of diet on inflammation, with a keen focus on the consumption of these beverages. The studies looked at a variety of risk factors for atherosclerotic cardiovascular disease, including inflammation biomarkers such as C-reactive protein, along with the impact of modern lipid-lowering treatments.
In discussing the results, it was noticed that inconsistent findings were produced from the analysed studies which made a conclusive determination challenging. However, a trend was observed where drinking tea and coffee seemed to raise adiponectin levels, reduce reactive oxygen species and lower low-density lipoprotein cholesterol levels. Despite these potential anti-inflammatory properties of tea and coffee being somewhat uncertain due to various confounding factors, their consumption is still recommended as part of a healthy diet.
Drinking coffee may be linked to lower mortality risk in type 2 diabetes patients.
2021 Nutrition, Metabolism and Cardiovascular Diseases Coffee consumption and cardiovascular diseases and mortality in patients with type 2 diabetes: A systematic review and dose–response meta-analysis of cohort studies Shahinfar H, Jayedi A, Khan TA, Shab-Bidar S
Systematic Review Cardiovascular Disease Coffee Type 2 Diabetes
In this study, the researchers conducted an exhaustive literature search through PubMed, Scopus, and Web of Sciences up to November 2020. They were looking for prospective cohort studies that evaluated the link between coffee consumption and the risk of cardiovascular disease and mortality in patients with type 2 diabetes. Two reviewers took on the work of extracting relevant data and assessing the certainty of evidence using the GRADE approach. A random-effects model was deployed to estimate hazard ratios. Dose-response connections were modeled using a one-stage mixed-effects meta-analysis. The researchers included ten prospective cohort studies that totalled 82,270 cases.
The results showed an interesting trend: compared to those who did not consume coffee, the hazard ratios were consistently lower for mortality outcomes and cardiovascular disease, especially where the consumption rate was four cups per day. Importantly, no such association was found for either cancer mortality or stroke. The evidence suggested a potential inverse monotonic association between coffee drinking and mortality across all causes and cardiovascular disease, alongside a linear association for coronary heart disease and total cardiovascular events. The degree of certainty in these results was moderate for all-cause mortality, but was low or very low for all other reported outcomes.
Coffee consumption, particularly boiled coffee, may increase levels of certain cardiovascular risk markers, but no strong link was found to anti-inflammatory effects.
2021 The American Journal of Medicine Impact of Coffee Consumption on Physiological Markers of Cardiovascular Risk: A Systematic Review Daneschvar HL, Smetana GW, Brindamour L, Bain PA, Mukamal KJ
Systematic Review Cardiovascular Disease Coffee
Methodically considering pre-selected databases such as PubMed, Embase, CINAHL and more, this study rigorously searched for randomized controlled trials to analyse the impacts of coffee consumption on inflammatory indicators of cardiovascular risk. Duplicate data and trials that did not meet the study's criteria were removed. The remaining 17 studies that passed scrutiny were included in the analysis, looking particularly at effects of coffee on cholesterol levels, apolipoprotein B levels and interleukin 6 levels.
This comprehensive review resulted in interesting findings. Boiled coffee emerged as a potential culprit for increased levels of total and low-density lipoprotein cholesterol along with apolipoprotein B. Filtered coffee, on the other hand, did not show similar trends. In one trial, caffeinated coffee showed a noteworthy increase in blood interleukin 6 levels compared to participants who did not consume coffee. However, no robust anti-inflammatory effects connected to coffee consumption could be confidently ascertained to be a significant factor in reducing mortality rates related to cardiovascular disease.
The literature overall supports an inverse association between green tea and cardiovascular disease-related health outcomes, while the included meta-analyses generally suggested an inverse association between green tea and BMI-related and blood pressure outcomes.
2020 European Journal of Clinical Nutrition Green tea and cancer and cardiometabolic diseases: a review of the current epidemiological evidence Abe SK, Inoue M
Systematic Review Cancer Cardiovascular Disease Endometrial Cancer
The evidence on green tea consumption and health outcomes presented in this review suggests green tea may be favorable for cardiovascular disease, particularly stroke, and certain cancers such as endometrial, esophageal, lung, non-Hodgkins lymphoma, oral, and ovarian cancer. More evidence is needed to assess the impact of green tea on breast, gastric, and liver cancer risk. Additional studies could also help clarify the suggested null association with certain cancer sites: colorectal, pancreatic, and prostate cancer. Possible minor adverse events on health from green tea consumption were reported in one study, however these must be interpreted cautiously within the study context and possible finer dose-response implications. The findings for green tea and diabetes risk were inconclusive. For BMI the current evidence suggests a possible weak association, while the evidence is stronger supporting a decrease in blood pressure from green tea. More studies investigating a possible association between green tea consumption and other health outcomes such as cognition, injuries, respiratory disease would be informative to more completely assess the impact of green tea on human health.
In conclusion, our review suggests green tea may have health benefits especially for cardiovascular disease and certain cancer sites.
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