Caffeine: Friend or Foe?

Caffeine is a naturally occurring psychoactive stimulant in coffee berries, cacao fruits, and tea. Over 85% of U.S. adults drink at least one caffeinated beverage daily. Take coffee for instance. After learning this bitter-tasting beverage is not poisonous but rather spirit-lifting, ancient people invented different roasting processes and coffee variations with dairy products, sugar, and flavors. Till now, pseudoscience personality quizzes even randomly guess your personality type based on your go-to coffee choice. But what are some health effects of caffeine? What factors influence the amount of naturally occurring caffeine? How much should I consume each day?