everything will rot, food included. but i guess, it will be a bit easier than realistic. with a day being about 2.5 hours, we would have to produce new food 3-5 times per rl day otherwise. and there will be lots of different types of food. obviously, a cake rots faster than travelrations or heavily salted/smoked fish. it will depend on storage and what type of food you use. salt/sugar is not going to rot, some food might transfer into poison over time. so there is a large area from no-problem-food over consume-within-weeks to consume-within-hours.