Here is an interesting news item that appeared in the Times of India on 02 November 2007, that will gladden many a hearts!
According to a research carried out at the Granada University in Spain, a glass of beer is a better option than water to replace body fluids lost while exercising.
Read details here...
Obviously this need not be taken as a license to go overboard. Remember discretion is the key word.
The bottom line: exercise if you want to truly enjoy your pint!