College hostel, the night before an exam. Everyone has a book in one hand, and either coffee or some sort of energy drink in the other. The later it gets, the greater the number of guys with the latter. It started with Red Bull, but now there are too many different brands to keep track of. One thing is certain, though, they all contain large amounts of caffeine and sugar, and new research links energy drinks to, among other things, seizures, diabetes and cardiac abnormalities.