I've mentioned on here before that my T will sometimes schedule me during her planned lunch time. She always lets me know ahead of time that she will be eating lunch during our session and also says that it's fine if I want to bring my own lunch. I've never actually brought my lunch with me...but I might, some day. It would probably be good for me, as I kinda have issues with eating in front of other people. So, while I never have had lunch during a session, I know it's an option that I have.