If I was playing a live tournament and knew I was going to be playing (potentially) for a long period of time, I would come prepared with healthy snacks. The way I look at it, your body is like an engine that needs fuel to function, so when I need something, I will fuel up (be it food or water).
When I played the Moneymaker tournament back in July, I had water with me the entire duration of the tournament, and on each break, I would have a small snack, and had a meal for dinner as well. That first day started at 1pm, and finished almost 12:30am the next morning, so I felt fairly fresh towards the end of the night, which helped me to chip up a little bit, especially in the last half hour when some people were started to fade.
To me, if you're doing something that requires ANY kind of endurance, whether it's mental or physical, it's absolutely necessary to make sure you are fully prepared, because any mistakes made can result in you losing a game or getting hurt (if what you are doing requires physical exertion).
So it's not so much do I like to eat while I play, it's more do I feel it necessary to have something to eat while I play, and the answer to that is yes.
