A scientific statement from the American Heart Association has concluded that moderate caffeine intake poses no added danger to the heart for most adults. Published on 20 July 2026 in the journal Circulation, the review synthesises observational studies, trials and mechanistic data to draw a clear line between traditional coffee and high-dose alternatives.
Up to 400 milligrams of caffeine daily, the amount found in roughly three to five eight-ounce cups of black caffeinated coffee, is generally safe. Habitual consumption of caffeinated coffee without added sugar or cream is associated with lower risk of type 2 diabetes, heart disease, stroke, heart failure and certain irregular heart rhythms.
The distinction between coffee and energy drinks emerges sharply from the evidence. High doses of caffeine, such as those found in energy drinks including energy shots, may have harmful effects on the heart and should be avoided, said Gregory M. Marcus, chair of the scientific statement writing group and professor of medicine at the University of California San Francisco.
Differences in outcomes appear linked to both caffeine concentration and accompanying compounds. Coffee contains chlorogenic acid and other natural elements absent from many processed beverages, while energy drinks often deliver taurine, extra sugars and far higher caffeine loads per serving. Unfiltered coffee can raise low-density lipoprotein cholesterol levels, the statement notes, yet filtered versions largely avoid this effect.
Individual responses to caffeine vary widely. Although research suggests that caffeine consumption may be associated with certain cardiovascular benefits for some people, it is important to remember that there is no one-size-fits-all strategy for safe caffeine consumption, Marcus added.
