Caffeine is a compound found in a variety of plants and acts as a natural pesticide which protects plants from the insects that feed on them. In the human body, however, caffeine behaves like a psychoactive stimulant drug by arousing the central nervous system and it is also a gentle diuretic. Caffeine is most prevalently found in the cherries of coffee plants, in leaves of tea bushes, in the kola nuts, in yerba mate, in guarana berries, in cocoa plants, in yaupon hollies and in certain species of beans. Most of our caffeine intake, and we take in quite a bit of it, is through the consumption of coffee, tea, cocoa, soft drinks as well as sports and energy drinks.