depends on what you drink, some works fine, but dont expect a miracle, some does not really work, and some are just plain bad for you.
I do think they require you to eat before drinking them tho, the way most of them works, is releasing certain chems into your system, some of them (like coffeine) you get resistant to fairly fast but others (like magnesium salts) works pretty well, requires some substance in the stomache to work well tho.
Then there is gaurana (spelling?) which is a substance somewhat like coffeine but slightly more powerful, and takes longer to get out of your system (the mody will neutralice it in 2-5 hours)
then ofcourse there is sugar in some of them, which is not really a natural-pick-me-upper, it will not do wonders.
If you can find them, there are some energy drinks, made from healthier substances, lige veggeis, tastes horrible tho :s
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