Whether it's a latte, cappuccino, or black coffee, a morning cup kickstarts the day for millions. But how much is truly too much? Recent research from the University of South Australia shows that six or more cups daily can harm health, raising heart disease risk by up to 22%.
In Australia, cardiovascular disease strikes one in six people and causes a death every 12 minutes. Globally, it's the top killer but among the most preventable, according to the World Health Organization.
This study examined long-term coffee consumption's link to cardiovascular disease, pinpointing excess caffeine's role in elevating blood pressure—a key heart disease precursor. For the first time, it defines a safe upper limit for coffee intake and heart health.
“Coffee is the world's top stimulant—it energizes, boosts focus, and fights fatigue—but everyone wonders: 'How much caffeine is too much?'” notes the lead researcher.
“Drink too much, and you might feel jittery, irritable, or nauseous as caffeine revs your system. We also know high blood pressure from excess caffeine heightens cardiovascular risks.”
“To safeguard heart health and blood pressure, cap coffee at fewer than six cups daily. Our data shows six as the tipping point for negative effects.”
Analyzing 347,077 participants aged 37-73, the study assessed the caffeine-metabolizing CYP1A2 gene. Even fast metabolizers—processing caffeine four times quicker—faced elevated risks with high intake.
“Moderation is essential. Push limits, and your health suffers,” the researchers conclude.
