Sounds like no fun, right? When you have 12 hours to kill on an airplane, a lot of people’s favorite way to kill time is to throw back a few drinks. When you’re 30,000 feet high, the stale air on the plane already puts you in a dehydrated state. Unfortunately, alcohol not only adds extra calories (don’t you want to fit in that bikini?), but it also parches your body, putting you further into a dehydrated state. “Being dehydrated worsens the physical symptoms of jet lag…and alcohol…can disturb your sleep,” according to Harvard Medical School’s Family Health Guide. Another Harvard Health Publication in Healthbeat goes on to say that “alcohol promotes dehydration, which worsens the symptoms of jet lag.” Make sure to drink lots of water before, during and after your flight to keep you hydrated. Once you get to your destination, drink plenty of water, and only then indulge in that piña colada you’ve been craving.