This article blows my mind!
I graduated from a private high school in '99, and yes, we all had lunch breaks, which were scheduled during periods four through six; as they were during regular periods, that meant you would have about 50 minutes for your lunch break.
While some of us may have used the time to go to the library to catch up on work, we at least had the *option* of doing so. It's a long day as it is, especially if you were like me and were involved in a number of organizations that met before and after school. And I'm not trying to negate anyone else's after-school curricular activities, but I ran cross-country - I needed to eat!