There is so much to do during the World Series of Poker, it's not hard to forget about staying in shape and being healthy. At the same time, optimal poker play — especially during long tournaments — depends a lot on being at your best physically.
Even more important, without at least a reasonable amount of attention to your health, you can suffer medical problems during your stay. Believe me, from personal experience of severe dehydration and fatigue in the emergency room at Las Vegas's Sunrise Hospital & Medical Center, that's a real inconvenience.