Caffeine and Heart Health: Up to 400 mg a Day Is Safe for Most Adults
October 1, 2026
Caffeine and Heart Health: Up to 400 mg a Day Is Safe for Most Adults
A recent scientific statement from the American Heart Association reviews the available evidence: moderate caffeine consumption, particularly from coffee and tea, does not appear to harm the cardiovascular system and may be associated with a lower risk of certain cardiovascular diseases.
Up to approximately 400 mg of caffeine per day, equivalent to roughly 3–5 8-ounce cups of coffee, is considered safe for most adults. Available evidence also shows an association between moderate caffeine consumption and a lower risk of coronary heart disease, stroke, heart failure, and atrial fibrillation. However, much of the research is observational and therefore does not establish that caffeine itself directly causes these potential benefits.
The source and preparation of the beverage may also matter. Unfiltered coffee, such as coffee prepared with a French press or in the Turkish style, contains cafestol, a compound that can increase LDL cholesterol. By contrast, coffee prepared with a paper filter has not been shown to have this effect in controlled studies.
The situation is different with energy drinks. Although the available evidence is limited, studies generally suggest potentially unfavorable cardiovascular effects, particularly in the presence of high doses of caffeine and other stimulants.
Experts nevertheless emphasize that these findings do not constitute a recommendation for people who do not currently consume coffee or tea to start doing so. Individual responses to caffeine vary considerably, including because of genetic factors and previous patterns of caffeine consumption.
The Original Source
This summary is based on the article by Rita Rubin, MA, Caffeine and Cardiovascular Health: What the Science Says, published online in JAMA on September 18, 2026 (DOI: 10.1001/jama.2026.16716).
The article discusses the American Heart Association scientific statement on caffeine and cardiovascular health. The statement emphasizes that moderate consumption of naturally occurring caffeine is likely not harmful to the cardiovascular system for most adults and may be associated with protective effects, while noting substantial individual variability in caffeine metabolism and response.
Source: Rubin R. Caffeine and Cardiovascular Health: What the Science Says. JAMA. Published online September 18, 2026. doi:10.1001/jama.2026.16716.
