Coffee remains one of the most popular beverages in the world, and its impact on human health continues to be actively studied by scientists. For a long time, it was believed that caffeine could harm the cardiovascular system and trigger dangerous arrhythmias [1]. However, modern clinical and epidemiological studies are forcing a reconsideration of established medical dogmas.
Coffee and Heart Rhythm: Debunking Myths
Traditional views often linked coffee consumption to proarrhythmic effects. Nevertheless, large-scale scientific work in recent years shows a different picture. For example, the randomized clinical trial DECAF evaluated the effect of regular caffeinated coffee consumption on patients with atrial fibrillation [1]. Additional statistical and Bayesian analyses of such trials help to accurately assess the clinical significance of the results and understand the real balance between benefits and potential risks [7].
Furthermore, systematic reviews and meta-analyses of population cohorts (including hundreds of thousands of participants) show that moderate coffee consumption — for instance, about one cup per day or less — not only does not increase the risk of atrial fibrillation, but in some cases even demonstrates a slight inverse association with newly diagnosed pathology [2].
The Effect of Caffeine on the Nervous System and Parkinson's Disease
Of particular interest to researchers is the link between coffee consumption, blood levels of caffeine metabolites, and the risk of developing neurodegenerative diseases. Large European studies (the EPIC4PD project) and multicenter works confirm an inverse association between caffeine consumption and the risk of developing Parkinson's disease [3].
Scientists are studying not only the beverage itself but also biomarkers — caffeine breakdown products (metabolites) in blood plasma, as well as their interaction with the gut microbiome [6]. At the same time, studies of brain dopamine system functions show that even in the early stages of the disease, caffeine metabolism characteristics may be linked to clinical symptoms and the state of brain pathways [8].
Potential Risks and Concomitant Factors
Despite numerous beneficial properties, including significant antioxidant potential, coffee abuse or its combination with adverse lifestyle factors requires caution. In gastroenterological scientific literature, diet is often considered comprehensively: for example, the impact of ultra-processed foods and associated habits on the development of peptic ulcer disease is evaluated [5], where protective plant extracts are also studied [4].
- Moderate consumption (1 cup per day) is in some cases safe for heart rhythm [1, 2].
- Caffeine and its metabolites are associated with a reduced risk of Parkinson's disease [3, 6].
- Individual physiological characteristics and concomitant gastrointestinal diseases must be taken into account [4, 5].
Sources
- 1. Caffeinated Coffee Consumption or Abstinence to Reduce Atrial Fibrillation: The DECAF Randomized Clinical Trial. PubMed
- 2. Is Coffee Consumption Associated With Increased Risk of Atrial Fibrillation: A Systematic Review and a Meta-Analysis. PubMed
- 3. Association of Coffee Consumption and Prediagnostic Caffeine Metabolites With Incident Parkinson Disease in a Population-Based Cohort. PubMed
- 4. Diospyros kaki fruit aqueous extract mitigates peptic ulcer induced by alcohol in rats. PubMed
- 5. Association between consumption of ultra-processed foods and incidence of peptic ulcer disease. PubMed
- 6. Investigating Plasma Metabolomics and Gut Microbiota Changes Associated With Parkinson Disease. PubMed
- 7. Understanding unexpected results from randomized clinical trials - Does coffee reduce atrial fibrillation recurrences? PubMed
- 8. Dietary Caffeine and Brain Dopaminergic Function in Parkinson Disease. PubMed
Disclaimer: The information provided in this article is for informational purposes only and does not replace an in-person consultation with a medical specialist.