Well, I like to drink, coffee and/or wine, if Im on beer I tend to be wasted, bad habbit to be wasted especially after 3 hours of play and 12 beers in your system.
Cash games with friends we are all drunk, so it rarely matters, and cannot lose much money because it is a drag to go to the bank while wasted and high.
Live tournaments or cash, I go gor radlers, better to have to go to the corner every hour than to be wasted.