Excessive caffeine consumption can lead to various potential consequences, including heightened anxiety, insomnia, and increased heart rate. Overstimulation of the central nervous system can result in jitteriness and restlessness. Additionally, high caffeine intake may disrupt sleep patterns, impacting overall health and well-being. A dependency on caffeine may develop, leading to withdrawal symptoms like headaches and fatigue when consumption decreases. Moderation is key; understanding personal tolerance can help individuals enjoy the benefits of caffeine without adverse effects on mental and physical health.