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
