How Much Coffee Is Too Much? New Research Shows Four Cups a Day Could Be Dangerous

A new study has raised alarms about the health risks of drinking more than four cups of coffee a day, even for those in good health.

The New York Post reported on research presented at the American Heart Association’s annual meeting. The study showed that ingesting over 400 mg of caffeine per day—roughly equivalent to four cups of coffee, ten cans of soda, or two energy drinks—may elevate the risk of heart disease.

Dr. Nancy Kagathara from India’s Jiddu Medical College explained, “Regular caffeine consumption can disrupt the parasympathetic nervous system, leading to higher blood pressure and heart rate.” She warned that even healthy people could be at risk for hypertension and cardiovascular issues due to caffeine’s effects on the autonomic nervous system. Kagathara emphasized the need for more awareness to protect heart health.

The study tracked 92 healthy adults aged 18 to 45, finding that about 20% consumed more than 400 mg of caffeine daily. Those drinking this amount showed significant heart rate and blood pressure increases over time. Participants who consumed over 600 mg of caffeine a day—roughly six to seven cups of coffee—experienced even more significant cardiovascular impacts.

The U.S. Food and Drug Administration (FDA) states that a daily intake of 400 mg of caffeine is generally safe for healthy adults, though some individuals may be more sensitive to its effects. Other studies have found that coffee can offer benefits, such as lowering the risk of certain cancers or enhancing mood.

A 2021 study indicated that consuming 75 mg of caffeine every four hours can lead to sustained mood improvements, and even the aroma of coffee may enhance memory. However, the current research underscores the risks associated with excessive caffeine consumption, stressing the importance of staying within recommended amounts.