Caffeine, found in coffee, tea, energy drinks, and some sodas, can have both positive and negative effects on health. On the positive side, moderate caffeine consumption can enhance alertness, concentration, and cognitive function. It may even provide a temporary mood boost. Additionally, caffeine can increase metabolism and promote fat burning, making it a component in some weight loss supplements. However, excessive caffeine intake can lead to negative health consequences. It can disrupt sleep patterns, causing insomnia and restlessness. Overconsumption may also result in jitteriness, increased heart rate, and elevated blood pressure. Some individuals are more sensitive to caffeine and may experience anxiety or digestive issues. Pregnant individuals should be cautious, as high caffeine intake may harm the fetus. Overall, moderate caffeine consumption, typically up to 400 mg per day for most adults, can be a part of a healthy diet, but individual tolerance should be considered.