Drink Up: Coffee Won’t Affect Your Heart Rhythms

“Most people have around 100,000 heartbeats per day,” said David Kao, an associate professor of medicine and cardiology at the University of Colorado School of Medicine. Doing the math, he said, on days when trial participants drank coffee, about 0.15% of their heartbeats involved a premature ventricular contraction -- versus 0.1% on no-caffeine days.