Are there any reliable researches defending the regular consumption of coffee at work?
closed as not constructive by Adam Wuerl♦, Tom Wijsman, HedgeMage Jul 7 '11 at 4:42
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"Caffeine is a stimulant which makes you feel less tired and, for athletes, delays exhaustion. So if the alternative is being asleep, caffeine cetainly helps.
The other issue is that the regular use of caffeine leads, as with other psychoactive substances, to dependency (tolerance or addiction are other words used). In such cases, lack of caffeine leads to withdrawal symptoms such as drowsiness and irratability. For dependent individuals, a cup of coffee will remove these symptoms in the short term, aiding concentration, though it is less clear whether this is an improvement on never having taken caffeine."
There are links on that page.
This article seems to suggest that there is a relationship with caffeine similar to a dependency, wherein after some time, the caffeine no longer makes you more stimulated, but rather brings you up to "normal". Or, put another way, it lowers your baseline, so that the stimulated state with caffeine of a dependent individual is only as good as the non-stimulated state of a non-dependent one.
There seem to be a lot of scientific literature around this question. Here is one article that seem to answer your question:
A. Smith: Effects of caffeine on human behavior
I also saw this article more about redbull but also comparing with coffee: C. Alford, H. Cox and R. Wescott: The effects of Red Bull Energy Drink on human performance and mood http://www.springerlink.com/content/xxdbgvjy9ke72wbl/