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Coffee

If you’re a regular coffee drinker, skipping java when you’re hung over may—or may not—be a good idea, Brick says. You may wind up layering a pounding caffeine-withdrawal headache on top of your hangover woes when you miss your regular morning fix.

That said, caffeine narrows your blood vessels and boosts blood pressure. "Both of these may make the hangover worse," Brick says. "If you drink coffee regularly, you might try a very small amount in the morning. Wait 30 to 60 minutes and see how you feel."

Next: Water and sports drinks