Caffeine is commonly consumed in our society through coffee, tea, and caffeinated sodas. The document discusses both the beneficial and harmful effects of caffeine consumption. In moderation (up to 3 cups of coffee per day containing 250mg of caffeine), caffeine consumption provides benefits like increased alertness but has minimal health risks. Excessive caffeine intake above 10 cups of coffee per day can cause negative side effects like headaches and difficulty sleeping. Overall, moderate caffeine consumption is considered safe for most people.