system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do sugary drinks give people worse hangovers?
gpt
I don't know about hydration issues, but the biggest factor in a hangover is the length of time you're exposed to acetaldehyde (a metabolic byproduct of ethanol in the liver) and to a lesser extent, methanol. It's hard work for the liver to manage, but it does it like a champ, however sugar competes with alcohol for metabolic resources. 

The more sugar you take in along with your alcohol, the longer it's going to take to break down the most noxious byproducts of ethanol metabolism, and the worse your hangover is.