I mean that the days that I am working, I eat lunch and dinner there, whatever I have packed and I won´t cheat as I don´t have other option. So I don´t need to bother much about what to pack, anything easy that is on the diet will do. That is why I have decided to have those days as my PP days.
It just works for me. I might have not explain myself cleary enough. English is not my 1st language.