Tons of ideas. Usually I will bring some leftovers and either heat them up or eat them cold. There are tons of neat bento boxes and insulated food containers for soups and other hot dishes. I generally go out for lunch or order in because I am usually not good enough to pack a lunch I hope to get better at that but at the moment I have some decent places to eat right across the street or a couple blocks up so I really don't worry or if I can I snack a bit and then have a heartier dinner or earlier dinner.