Whether you favor a strong espresso, a creamy latte, or decaf, your coffee preference might reveal more about your cardiovascular health than you realize. In a world-first study of 390,435 people, researchers at the University of South Australia (UniSA) uncovered causal genetic evidence linking heart health—specifically blood pressure and heart rate—to coffee consumption.
Working with the South Australian Health and Medical Research Institute (SAHMRI), the team found that individuals with high blood pressure, angina, or arrhythmia are more likely to consume less coffee, opt for decaf, or skip it entirely compared to those without these conditions—a pattern driven by genetics.
Lead researcher and director of UniSA's Australian Centre for Precision Health, Professor Elina Hyppönen, highlights this as a reassuring discovery: our genetics actively regulate coffee intake to safeguard against excess.
"People enjoy coffee for many reasons—boosting energy, savoring the taste, or as a daily ritual," says Prof. Hyppönen. "Yet, we often overlook how individuals instinctively self-regulate caffeine based on blood pressure levels, thanks to protective genetic mechanisms."
"Heavy coffee drinkers likely have a higher genetic tolerance for caffeine, while those who drink little or choose decaf may be more sensitive to its effects and prone to hypertension."
In Australia, high blood pressure affects one in four men and one in five women, raising risks for stroke, heart failure, and chronic kidney disease.
Analyzing UK Biobank data on coffee habits alongside baseline systolic/diastolic blood pressure and heart rate, the researchers used Mendelian randomization to confirm causal links.
Prof. Hyppönen notes that coffee consumption serves as a subtle indicator of cardiovascular health. "Whether you drink lots, a little, or none, genetics guide these choices to protect your heart," she says. "If your body resists that extra cup, trust it—it's attuned to your well-being."
