Moderate caffeine consumption, mainly through coffee intake, has generally proven safe for most adults and may be associated with a lower risk of certain cardiovascular diseases. This is the takeaway from the American Heart Association (AHA) new scientific statement, which re-evaluated the available evidence on the cardiovascular effects of caffeine and the main beverages that contain it.
Not just caffeine: the role of other coffee compounds
Interpreting coffee’s impact on cardiovascular health is not straightforward. Although caffeine is the most studied compound, coffee contains numerous other bioactive substances, including chlorogenic acids, diterpenes, trigonelline, and melanoidins, which may contribute to the outcomes seen in epidemiological studies.
An especially interesting finding is that several studies have documented favorable associations with decaffeinated coffee as well. This suggests that part of the observed benefits does not depend solely on caffeine, but also on other bioactive components present in the beverage. Among the proposed mechanisms are antioxidant and anti-inflammatory effects, improved endothelial function, greater insulin sensitivity, and modulation of the gut microbiota.
Blood pressure: a complex relationship
According to the evidence reviewed by the AHA, the relationship between habitual coffee consumption and blood pressure appears complex and non-linear. In most prospective studies, moderate coffee intake is not associated with a significant increase in hypertension risk and may even be linked to a lower risk than not consuming coffee at all.
The acute effects of caffeine and those from habitual consumption seem to differ. While occasional intake can cause a modest transient rise in blood pressure, habitual consumers develop a tolerance that may blunt this effect. Overall, the statement concludes that the long-term effects of caffeine on blood pressure appear modest.
The situation is different for energy drinks. The available evidence, though limited, points to a possible rise in blood pressure and other unfavorable cardiovascular effects, probably tied not only to caffeine but also to other ingredients commonly added to these beverages.
The link with type 2 diabetes
Epidemiological evidence shows rather consistently an association between habitual coffee consumption and a reduced risk of type 2 diabetes. In particular, numerous observational studies and meta-analyses have reported an inverse relationship between the amount of coffee consumed and the incidence of the disease.
The mechanisms behind this association are not yet fully understood. Beyond caffeine, other coffee components, such as chlorogenic acid, a polyphenol involved in glucose metabolism, may play an important role. Additionally, micronutrients such as magnesium and chromium could contribute to the improved insulin sensitivity observed in some studies.
Coffee and lipid profile: the method of preparation matters
Regarding lipid metabolism, the statement notes that any potential rise in LDL cholesterol is attributable mainly to the diterpenes found in unfiltered coffee, particularly cafestol.
Paper-filtered coffee contains very low amounts of these compounds and does not appear to significantly affect cholesterol levels. Preparations such as espresso and moka show intermediate concentrations. Therefore, when evaluating coffee’s cardiovascular health effects, the method of preparation is a relevant factor.
Coronary disease, heart failure, stroke and arrhythmias
The available evidence indicates that moderate coffee consumption is not associated with an increased risk of coronary heart disease and may, conversely, be linked to a lower incidence of coronary disease and heart failure. Similarly, numerous studies have documented an association between moderate coffee intake and a reduced risk of stroke.
On the arrhythmia front, the data are broadly reassuring. The habitual consumption of caffeinated coffee is associated with a lower frequency of atrial fibrillation. However, some randomized studies have observed an increase in premature ventricular contractions (PVCs), suggesting that effects may differ depending on the type of arrhythmia considered.
The cardiovascular benefits observed could arise from multiple mechanisms, including anti-inflammatory effects, metabolic improvements, and interactions with adenosine receptors. However, given that the data are predominantly observational, a definitive causal relationship cannot be established.
The AHA conclusions
Overall, the American Heart Association’s document concludes that moderate caffeine consumption, about 400 mg per day (roughly 3–5 cups of coffee), is generally safe for most adults and is not associated with an increased cardiovascular risk. In contrast, habitual coffee consumption appears to be linked with a lower risk of several conditions, including type 2 diabetes, stroke, atrial fibrillation, heart failure, and coronary artery disease.
However, the authors note that effects may vary based on individual characteristics, consumption patterns, and the caffeine source. In particular, high-caffeine energy drinks represent a distinct category and warrant greater caution, in light of potential adverse cardiovascular effects reported in the literature.
Study
Marcus GM, Hu FB, van Dam RM, et al. Caffeine and Cardiovascular Disease: A Scientific Statement From the American Heart Association. Circulation. 2026;154(9):e345-e355. doi:10.1161/CIR.0000000000001454
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