caffeine

Do you like coffee, tea or energy drink?
I often drink coffee or energy drink, but I worry about caffeine and caffeinism because they say that these drinks have much amount of caffeine.
So I will talk you about caffeine and caffeinism.
First of all, I will talk about what caffeine is.
Caffeine is one kind of alkaloids, like morphine or cocaine.
Coffee can make you awake because caffeine has an irritant action.
But too much amount of caffeine can cause caffeinism.
The main symptoms of caffeinism are a palpitation, a fretfulness and a hallucination．
There are two types of caffeinism, one is acute and the other is chronic.
If you take too much amount of caffeine in a short term, you can have an acute caffeinism.
Oppositely, if you take a certain amount of caffeine, you can have a chronic caffeinism.
There are nothing to do for caffeinism, so you should avoid to drink too much amount of coffee, tea or energy drink.