That is the key thing that is wrong with the whole "work ethic" rhetoric. Working longer hours is not good for productivity unless you have a job that basically has no quality metric attached to anything you produce and quantity is just measured in time worked.

Chances are many are still working. They're combining eating with socialising with peers in the hundreds of bars and restaurants and discussing many things, including work related stuff... which is a lot healthier than always eating alone at your desk.