Jersey said:
I eat EARLY and HEALTHY...don't drink anything but H2O during play...if its an all day affair...I eat only protein, and not to much...meat digestion is the hardest on the body...makes you lathargic...if I have a liquid lunch or a buger and fries or something like that...save that for after the win!
Meat doesn't affect me that way, but even so I make sure I get a good dose (~1/3 cup or so on cereal) of soy protein
before bed, as the body rebuilds itself during rest and needs protein to do it. Soy has a bunch more advantages, too.
I also avoid simple carbs before/during play to keep the blood sugar somewhat steady (except a beer, perhaps

)
I've observed my mentor, Don McCoy, during day-long tournaments and he oscillates between a cup of coffee, perhaps a beer, more coffee, water, some light food, maybe another beer, then some coffee, water, etc. etc. He never gets drunk or speedy, or filled up, he just kind of maintains a level demeanor throughout the day. His successful experience through the years has more than demonstrated the effectiveness of this technique---for himself, anyway.
One thing I've discovered, having been in the nutrition business now for over 23 years, is that every body is different and what works for one may not work for another. So, experiment, keep track, and do what works.
Jeff Livingston