As an older player I have to be careful. The pool room food where I play is not the best, so I try to eat at least two hours before I play and keep some trail mix or energy bars in my case to snack on.
Our monthly one pocket is this Saturday and likely to last 10/12 hours if I am lucky enough to remain to the end. There is usually a 1/2 hour waiting period if you are around late in the tournament and that is when I refuel.
If you play in tournaments, sometimes you have to each and play. Yr. ago I learned to always Eat and then ''Play'' . Why Not? You now have more energy, and it's good getting the OLD oil rig doing it's thing keeping the hydraulics workin' .
They used to tell me (grew up on a WI lake) to never go swimming right after you eat..........phew.
For me, if I eat just before playing I get light headed, or foggy, if you will. The blood leaves the head and goes to the stomach to help digest the food. Eating light snacks helps in keeping the energy up.
I have to eat before I play and for sure have energy bars / snacks / smoothies and other things at my disposal so i can consume if and when I start to feel bad from going too long without eating. When I was younger not so much but now, absolutely!
My problem is I eat too much all the time. But seriously back when I used to play long sessions, I ate very little. The old Mexican players and I mean the top players of that time 60s-70's used to eat small portions of honey. I mean they'ed have small packages of honey and eat maybe a half ounce or so every hour and drink lots of water during extended matches. They felt that the honey took a little longer to digest and stayed in their system longer, was not filling and could regulate the calories and energy required for long sets.