I'm a serious lardass with a monstrous appetite, but I never stop for food at the turn and don't enjoy playing with people who do. I just can't stand the flow of the round being interrupted. If I've had a crappy front 9, I'm in a hurry to try to get things turned around. If I've had a good front, I want to see if I can keep up the momentum. If my play has been average for me, I'm in a hurry to see if the round is going to go one way or the other. Basically, I just have no patience.
If there's a backup on the 10th tee, that's a little different in regard to one of my playing partners grabbing a quick bite. If there's no logjam, I prefer no delays at all. I don't ever want to play a round that features a full meal in the middle, no matter how good the food is. I'll wait until we're done.
As far as nature calling, most golf courses (with their trees and other physical features) are among the easiest places in the world to achieve on-ground relief in the absence of a nearby facility (at least in regard to No. 1 for males). I accomplished it right off the back of the 18th tee at Pebble Beach, right over the rustic-looking wooden rail. I was paired with a guy from Minnesota and he opted to do it, too. Granted, it was getting near dark. If it hadn't been, I doubt I would've done it and I know the Minnesota guy wouldn't have.