What does a coffee on your body :)

So much talking about studies proving the beneficial effects of caffeine that we forget that caffeine is a drug, and in large quantities can be dangerous.
Even if now you settle for a cup a day, soon you might need a higher dose, and high doses means a number of serious problems, from addiction and mental illness reaching.
Even if you can not kill someone, coffee does have some effects on your body, you want some other less desirable.
Caffeine in the category of psychoactive substances, ie those that reach the brain and central nervous system effects. Globally, caffeine is the most widely used psychoactive stimulant, but compared to other such substance - amphetamines, cocaine, nicotine - its consumption is not regulated in any way.
The quantity to be consumed to him feel the effects vary from person to person, depending on the degree of tolerance and body weight. If you feel energized immediately after you drink coffee, it just means that your subconscious. The coffee reaches the bloodstream about 45 minutes after you drink it. In the next quarter of an hour to reach the brain where they start replacing adenosine, a substance that signals the need for sleep. As a result, increase heart rate, blood sugar and body temperature.
In fact, caffeine does not cancel the need to sleep, but only for a time reduce fatigue. No matter how much coffee you drink, your body still needs eight to nine hours of sleep each night.
Coffee is a drog
Like other substances that act on the brain, caffeine is addictive and tolerance. If you drink coffee every day, the brain adapts and produces higher amounts of substance that signals the need for sleep.