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Coffee intake may have a variable effect on inflammation markers, with different responses noted between men and women and across various geographical regions.
The researchers carried out a systematic review and dose-response meta-analysis on the relationship between coffee intake and C-reactive protein (CRP) levels, an inflammation biomarker. They studied eleven previous studies involving a total of 61,047 participants from three different continents. These studies were chosen using the PubMed database. The selected studies had different findings: some showed a negative relationship between coffee and CRP levels, others showed a positive relationship while some showed no significant associations. The researchers analyzed the data from these studies using mixed-effects meta-regression models, with the volume of coffee consumed as the metric.
Regarding the discussion of results, there revealed to be considerable variation between the individual studies included in the meta-analysis. In three of the largest studies, it was found that the relationship between coffee consumption and CRP levels appeared to be different depending on the gender of the participant and their location. Women from Europe and the United States, as well as Japanese men, showed a decrease in CRP levels with increased coffee consumption. However, European men showed an increased inflammation marker. When all studies were considered together, no significant relationship between coffee consumption and CRP levels was found among all participants or when the data was stratified by gender or geographical location, showing the contradictory nature of the results noted in individual studies.
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Pomegranate juice consumption appears to somewhat enhance inflammatory status and complete blood count in hospitalized COVID-19 patients.
2023 Complementary Therapies in Medicine Adjuvant pomegranate juice intake improves the inflammatory status of hospitalized COVID-19 patients: A randomized and placebo-controlled trial Yousefi M, Sadriirani M, Mahmoodi S, Samimi B, Pourmahmoudi A, Hosseinikia M, et al.
Randomised Controlled Trial Common Cold, Flu & Viral Infections COVID-19 CRP
The study was a randomized, double-blinded placebo-controlled trial involving 48 patients and had two parallel arms. As part of their standard hospital care, patients were either given 500 mL of whole pomegranate juice daily or a placebo for a period of 14 days. The researchers focused on measuring inflammatory indicators and complete blood counts both at the start of the study and at the end of the 14-day intervention period.
Following the 14-day intervention, there was a distinguishable decrease in primary outcomes including inflammatory markers such as C reactive protein, interleukin-6, and erythrocyte sedimentation rate in the group that consumed pomegranate juice as compared to the readings before the intervention. In addition, considerable changes were also observed in secondary outcomes such as neutrophils, lymphocytes, platelets, platelets-to-lymphocyte and neutrophils-to-lymphocyte ratios in the pomegranate juice group compared to the parameters before the intervention. Finally, the mean changes in levels of interleukin-6, white blood cells, neutrophils, lymphocyte, platelets, platelets-to-lymphocyte ratio, blood oxygen saturation and MCV were significantly different between the two groups by the end of intervention, while no significant difference was noted in other blood indices.
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.
Almond consumption can significantly reduce the serum concentration of the inflammatory mediator, Interleukin-6, in adults but no significant effect is found on C-reactive protein.
2023 Complementary Therapies in Medicine A systematic review and meta-analysis of almond effect on C-reactive protein and interleukin-6 in adults Hariri M, Amirkalali B, Baradaran HR, Gholami A
Systematic Review Almond CRP IL-6
The methodology of this study involved running an electronic search for English-language studies across several databases such as Web of Science, PubMed, SCOPUS, ClinicalTrials.gov, and Cochrane library without any time restrictions. The effect sizes on serum concentration of C-reactive protein (CRP) and Interleukin-6 (IL-6) were calculated based on the mean changes of both intervention and control groups. Assessment of the overall effects and their heterogeneity was done using the DerSimonian and Laird random-effects model. To examine the statistical heterogeneity, Cochran's Q test and I-squared statistic were utilized.
With respect to the results, among the eleven studies involved, it was observed that almond consumption did not significantly affect serum CRP level. However, a significant decrease in serum IL-6 level was reported with almond consumption. Thus, reflecting the beneficial effects of almonds with regard to reducing the serum concentration of IL-6. The results derived for serum CRP were not substantial enough to be considered significant.
Consuming 2-3 cups of coffee daily can help prevent cardiovascular disease and drinking at least 3 cups of green tea has similar benefits.
2022 Trends in Cardiovascular Medicine Coffee and tea on cardiovascular disease (CVD) prevention Chieng D, Kistler PM
Review Article Cardiovascular Disease Coffee Green Tea
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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