I grew up in a house and have very defined thoughts on what "leftovers" to take home were.
What does growing up in a house have to do with the definition of "leftovers" vs. "staples"?
I thought that was odd, too, and concluded that something might've accidentally gotten deleted or missed typing in the post. Otherwise, I find it an incredibly bizarre correlation to make.
Sliced bread dries out. I'd think that it was OK to take some of it so it got eaten by somebody before it dried out.
I had this thought, too. To me, meat and veggies can always be frozen (that's what we did with the remaining leftovers from our wedding reception after we gave away all that we could). Bread could be frozen, too, but all that does is slow down the staling process; it doesn't stop it (and, in my and DH's home, we don't eat bread that often).
I grew up with a cultural heritage where we always give out food for the guests to take home and never for a moment considered any part of the meal wasn't available to take home. In fact, I remember one aunt actually went and bought take-out containers for everyone to pack up food to take home at the end. Also, Aunt wasn't afraid to tell everyone that they couldn't pack up food to go until the end of the party and that she was just letting one relative do it right that moment because that relative couldn't stay until the end (Aunt used her words to convey, specifically, the message she wanted to communicate
; we all who were staying acknowledged and didn't pack up food to go until the end).