In some places the 'proper meal' of the day isn't eaten at lunch time, but rather in the afternoon. Lunch is a quick sandwich and some fruit to get you through the rest of the day and then you have your proper meal at 4-5 after you get home.
The social part at school came after lunch when you go out to play. When I was at school lunch was story time, and we would sit and listen to the teacher read us a book while we ate.
No, a decent breakfast, then sandwiches for lunch, maybe a small snack around 2, then a warm dinner at 4-5.
edit: in general I would say that focusing what and how much you eat is far more important than focusing on when you eat if you care about health outcomes. Eating a quick healthy snack once every other hour is a lot better than junk food twice a day.
If you care about health outcomes, teenage boys should eat 3000 calories or more. Teenage girls should eat 2500 calories or more. Packing it into meals like described is basically impossible without junk food in the mix, if they do not have real lunch. There is decent breakfast, then nothing but snacks and sandwiches until dinner at 4-5 and I guess maybe second dinner after.
The social part at school came after lunch when you go out to play. When I was at school lunch was story time, and we would sit and listen to the teacher read us a book while we ate.