I know how to avoid a hangover No coloured alcohol. Learned this from a doctor who explained coloured booze like red wine, whiskey, etc is what gives you hangovers, clear non-coloured booze like vodka and gin won't. Turns out he was right.
It's similar to the fruit juices, sugar-wise. The more pale it is, the less sugar there it contains. A lot of people don't realize how the concentration of congeners can affect a hangover. The paler the booze, the less the hangover. However, you still can get a hangover if you overindulge enough.