Alcohol
 

Alcohol is dehydrating -- that may sound like a good thing. However, if your body is dehydrated due to alcohol consumption, it’s more prone to hold onto water from any other source to try and compensate for fluid loss. It’s best to avoid alcohol of any sort if you want well-defined muscles, especially if you’re prepping for an event. You’re better off to save the alcohol consumption for after the event.

I know this to be true, but man I love my whiskey on a Saturday evening. :p