Listen, I am busy.  I've got four little kids, two cats, a husband, and a mountain of laundry that never seems to go away.  I've got way better things to do with my time than carefully treating cut apples to keep them from browning.  It's funny though, the things that never occur to you until other people mention it.  I've been putting apples in the lunches since the beginning of lunches, and never really given it much thought. They're just apples.  I cut them, they eat them.