For many Hong Kong office workers who rely on coffee daily to stay alert, coffee is both a lifesaver and a source of concern. A long-standing myth suggests that caffeine causes heart palpitations and even heart disease. Nephrologist Dr. Jiang Shou-shan recently cited multiple large-scale medical studies to "clear" caffeine's name. He points out that the public generally misunderstands caffeine: feeling a faster heartbeat after coffee is not medically equivalent to "arrhythmia," and the two should not be conflated. Studies confirm that moderate caffeine intake is very safe for the cardiovascular system and even offers protective benefits.