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in the world. People consume caffeine in [[coffee]], [[tea]], [[cocoa]], [[chocolate]], [[soft drink]]s, and some drugs. The source of caffeine is either the coffee bean, the tea leaf, the elusive kola nut, or the cacao pod. Pure caffeine is odorless and has a bitter taste.

in the world. People consume caffeine in [[coffee]], [[tea]], [[cocoa]], [[chocolate]], [[soft drink]]s, and some drugs. The source of caffeine is either the coffee bean, the tea leaf, the elusive kola nut, or the cacao pod. Pure caffeine is odorless and has a bitter taste.

==Caffeine and your Nervous System==

==Caffeine effects==

Caffeine is a central nervous system [[stimulant]]. In moderate doses, caffeine may:

Caffeine is a central nervous system [[stimulant]]. In moderate doses, caffeine may:

* increase alertness

* Increase alertness

* reduce fine motor coordination

* Reduce fine motor coordination

* cause [[insomnia]]

* Cause [[insomnia]]

* cause anxiety and dizziness

* Cause anxiety and dizziness

* Potentiates the action of epinephrine causing increased heart rate and blood pressure

* Potentiates the action of epinephrine causing increased heart rate and blood pressure

In superbly massive doses, caffeine is lethal. A fatal dose of caffeine has been calculated to be more than 10 grams (about 170 mg/kg body weight) - this would be equivalent to  drinking 80 to 100 cups of coffee in rapid succession - a feat only [[Voltaire]] is alleged to have achieved.

In superbly massive doses, caffeine is lethal. A fatal dose of caffeine has been calculated to be more than 10 grams (about 170 mg/kg body weight) - this would be equivalent to  drinking 80 to 100 cups of coffee in rapid succession - a feat only [[Voltaire]] is alleged to have achieved.