Excessive caffeine consumption can negatively impact both health and fitness. It may lead to increased anxiety, sleep disturbances, and digestive issues. High caffeine intake can also contribute to elevated heart rates and blood pressure, potentially putting strain on the cardiovascular system. For athletes and fitness enthusiasts, excessive caffeine may result in dependence, leading to crashes in energy levels and diminished performance. It's essential for individuals to monitor their caffeine intake and find a balance that supports their health and fitness goals without adverse effects.