Many people who have to start the day early, find it
difficult to wake up properly.
For some of them the solution is very straightforward:
they drink two cups of coffee and the feelings of the
fatigue disappear. This is the effect of coffee, but also in
such drink as tea, cola and cocoa taken in reasonable amounts,
the stimulating chemical may help some people to work
more efficiently. However, excessive quantities of caffeine
can cause several irritating, unhealthy side effects.
Studies show, in fact, that more than two cups of coffee
a day can cause unpleasant symptoms such as
*nervousness, *irritability,
*stomach pain and *insomnia !

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