Somewhere along the way, the lunch break went the way of the DVD player and a tradie who actually turns up "between 9 and 11" on the dot, mostly mythical.
We used to take lunch like civilised people. You'd leave the building, get a bit of sun, smash a sandwich, sit on a bench and pretend you weren't thinking about emails. Lunch was a reset, not a background activity you did while refreshing your inbox.