The most popular drug in the world is a white powder. No, not that powder. This is caffeine in its most essential state. 'Caffeinated' reveals the little-known truth about this addictive, largely unregulated drug found in coffee, energy drinks, teas, colas, chocolate, and even pain relievers. We'll learn why caffeine has such a powerful effect on everything from boosting our mood to improving our athletic performance as well as how - and why - brands such as Coca-Cola have ducked regulatory efforts for decades. We learn the diffe.