A new American Heart Association scientific statement says most adults can generally consume up to 400 milligrams of caffeine per day, roughly the amount in three to five 8-ounce cups of regular coffee.
The statement, published in Circulation, notes that research on coffee is not the same as research on caffeine alone. Coffee contains many compounds, and observational studies cannot prove that coffee directly causes better cardiovascular outcomes.
Moderate consumption of unsweetened coffee was associated in studies with lower risks of several conditions, including heart disease, stroke, heart failure and some abnormal rhythms. Preparation and additions matter: sugar, cream and syrups change the drink’s nutritional profile, while unfiltered coffee contains more cafestol, a compound that can raise LDL cholesterol.
The association cautioned that energy drinks, shots and supplements can deliver caffeine in far more concentrated doses and have been linked to higher blood pressure and irregular rhythms. People respond differently based on age, medications, health conditions and metabolism, so the 400-milligram figure is not a personal prescription.
Source: SciTechDaily summary of the American Heart Association scientific statement, July 30, 2026.
