I'm lucky to have been in a job where people are encouraged to take their whole lunch break, away from the desk.
I'm on lunch break in a new job now and there seem to be quite a number of desk eaters. I really hope it's not that kind of place. Of course if it's a particularly busy day, I'll happily shorten or skip lunch, but I won't work through lunch on a normal day, where my work's all on track, just for the sake of presenteeism.
What's the norm for others?