Originally posted by Dandello:
One thing nobody mentioned 'closed campus' vs 'open campus' - a closed campus is one where the students are prohibited from leaving the school grounds during school hours. An open campus is one where students are allowed to leave. (And there are combinations - maybe freshmen are banned from leaving and the others are allowed, or maybe only seniors are allowed off campus.)
So for students with wheels on an open campus - lunch is frequently at the nearest pizza place or burger joint.
(This info spans the 1960s to the 2000s. I went out to lunch and my DS went out to lunch (30 years apart.)
On a closed campus the students will complain about the 'prison guards'. On an open campus, the neighbors will complain about the noise during lunch time with all the students waking by.
And in an urban, suburban setting, there will be restaurants like pizza and burgers, within a few blocks of campus.
And (at least currently) it's possible to have food delivered to a high school. Enterprising students on a closed campus might take orders for pizza slices then order in a couple pizzas. 
Very true. At my school upper classmen (seniors and juniors) were allowed off campus for lunch, but under classmen (freshmen and sophomores) were barred from that. Of course, there was still the chance to sneak off campus in those grades, which might be interesting.
And yes, I forgot about security. My school had a handful of security guards, each dubbed with a specific nickname (like "Terminator" or "Grandma"). Some were nice, some you avoided at all costs. I didn't even consider this, but they're there for disciplinary action, too. Though mostly for the immediate stuff- they break up the fights and make sure you have your student id's with you- which reminds me we also had to wear lanyards with are id cards on them. All. The. Time. Looking back, it wasn't a big deal, but everybody hated it.
