The real secret to avoiding hangovers is not to drink, or drink very little. But on the odd occasion when you over do it and need to function the next morning here are a few ways to prevent hangovers.  First, it is important to understand what causes a hangover.  As you will find out in the morning after a long night of drinking, alcohol evaporates water molecules in your system and hence dehydrates you.  It also affects your nervous system, as alcohol is a mild depressant, so when you wake up your body counter acts the affects and puts you in a hypersensitive state. As well, all the drinking has caused malnutrition, by flushing your nutrients and vitamins needed for your natural defense system. To prevent hangovers, you need to re-balance your body by focusing on these three areas.