Walter said that hangovers are a modern phenomenon due to the way commercial alcohol is processed. Centuries ago, it would go straight from a brewery to a tavern. You could drink as much as you wanted and barely have a hangover. Today, it's been processed with so much chemicals and that's why you get a hangover. Thank you Walter. Also, as a bonus fact, Walter says that beer has helped with the civilization of mankind. Thank you Walter. Today I learned.