Caffeine is chemical that is known to stimulate the CNS (central nervous system). It inhibits the activity of adenosine’s effector and helps a person avoid the feelings of drowsiness caused by adenosine typically.

More facts about caffeine:

• The majority of people drink their caffeine in drinks (coffee tea, tea, soda as well as energy drinks) and it is present in chocolate (all kinds).
• The most common guidelines for consumption of caffeine recommend that people limit their consumption to less than 400mg per day and that those who are expecting should limit their consumption to 200 mg per day (for information that a cup of coffee can contain 100-200 mg in it).
• Although caffeine is quickly absorbed in the bloodstream of your body (about 45 min) It can take up to 12 hours to go out of the body.