6 Surprising Things That Can Cause Killer Hangovers

Though you may prefer Guinness to Bud Light or Bourbon to vodka, research has found that your body may not. Dark beers, wines, and liquors all get their color from something called congeners, which are the byproducts from fermentation and distillation. ““The color is basically a chemical soup," says Dr. Schaefer, "and your body has to process the chemicals on top of the alcohol— that means it takes longer to get them out of your system." Enter headache and nausea.