Caffeine is everywhere in our society. It is in our most popular
beverages, our medications, and even in our desserts. The vast majority
of people consume caffeine in some form on a daily basis. Caffeine has
effects both good and bad. In small quantities it is considered a safe
stimulant. In large quantities it can make a person sick. Abuse of
caffeine over long periods of time can lead to severe health problems
and even death.
http://aarhealth.com/journal/?p=8