American Heart Association research confirms most adults can safely consume up to 400 mg of caffeine daily through coffee, but energy drinks may pose cardiovascular risks, according to a new scientific statement published in Circulation.
The American Heart Association (AHA) has issued a scientific statement clarifying that most adults can safely consume up to 400 mg of caffeine per day—equivalent to up to five 8-ounce cups of coffee—without increasing cardiovascular risk. However, the statement warns that energy drinks, which often contain concentrated caffeine, may harm heart health, particularly when consumed in large quantities.
Safe Caffeine Limits and Coffee’s Potential Benefits
The AHA’s statement, published in its peer-reviewed journal Circulation, emphasizes that moderate coffee consumption is generally safe for most adults. Caffeine consumed in coffee is a key part of daily life for millions of people, and in our review of the most recent research, for most adults, intake of up to 400 mg of caffeine/day, the equivalent of up to 5 cups of caffeinated coffee per day without added sugars or fillers, is safe and does not increase cardiovascular risk,
said Dr. Gregory M.
Research reviewed in the statement suggests that habitual coffee drinkers may experience lower risks of heart disease, stroke, and Type 2 diabetes. For instance, patients who had undergone treatment for an irregular heart rhythm experienced a 39 per cent lower risk of the condition returning when they consumed coffee regularly, IBTimes UK reported. Additionally, habitual coffee drinkers were found to have a 20 to 30 per cent lower risk of developing Type 2 diabetes.
For more on this story, see American Heart Association: Up to 5 Cups of Coffee Daily Is Heart-Safe.
Coffee’s potential benefits may stem from its bioactive compounds, which researchers suggest have antioxidant and anti-inflammatory properties. However, the statement cautions that these benefits are most pronounced when coffee is consumed without added sugars, creams, or flavorings.
Energy Drinks and Cardiovascular Risks
While coffee is generally safe, the AHA’s statement highlights significant risks associated with energy drinks. High doses of caffeine, such as those found in energy drinks… may have harmful effects on the heart and should be avoided,
the statement warned.
Dr. Jennifer Miao, a cardiologist and fellow with the ABC News Medical Unit, emphasized that energy drinks can trigger life-threatening heart rhythm issues. The statement also linked energy drinks to sudden spikes in blood pressure, even among otherwise healthy adults.
The AHA’s findings align with other research showing that energy drink consumption is associated with a higher risk of arrhythmias and hypertension.
Genetics, Preparation Methods, and Individual Variability
The statement also underscores that caffeine affects people differently due to genetic variations. A liver enzyme gene, CYP1A2, determines how quickly individuals metabolize caffeine.
Preparation methods also matter. The AHA found that paper-filtered and instant coffee, which remove a compound called cafestol, may offer greater heart health benefits than unfiltered varieties like French press or espresso. Elevated LDL cholesterol is a known risk factor for heart disease.
This follows our earlier report, American Heart Association Sets Daily Coffee Limit.
Adding sugar, cream, or flavorings to coffee may reduce its health benefits, though further research is needed. Adding sugar, flavored syrups, milk and/or cream may weaken coffee's potential health benefits,
ScienceDaily noted. The AHA recommends moderation, especially for those with existing cardiovascular conditions.
For most healthy adults, the AHA’s guidelines provide clarity on caffeine consumption. However, the statement acknowledges gaps in understanding, particularly regarding other caffeine sources like tea, chocolate, and medications.
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