Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Energy drinks are defined as highly caffeinated beverages designed to boost both mental and physical energy. Created primarily for students, athletes and others that may need an extra energy enhancement, energy drinks became well-known in Asia long before they reached the United States. Amongst most popular energy drinks are Red Bull, Rock Star, Spark, Monster and others. Learn more about energy drinks and their impact on human health, by reading this book.