I got into an argument surrounding beer type and hangover. Apparently there is a opinion that ales give you less hangover than lagers do (considering same alcohol content consumed).
My understanding is that a hangover is nothing more than dehydration caused by alcohol. More alcohol per unit of mass - more dehydration.
Is there any biological evidence to show that the same amount of alcohol consumed (with a different type of yeast) per same body mass would have different effects?