I just took the DAT today and you can bring food. They give you a little 1' by 1' locker to put your keys, wallet, and snack in. I would not recommend eating a big meal beforehand, it tends to make people sluggish and you need to be on top of your game. I took an apple and juice, but a sandwich would be good too. Just something to give you a little boost between sessions. Just remember that you only have 15 minutes, and they go by pretty quickly. Also, don't drink a lot of water before the test, there's nothing more distracting than having to pee during a timed test.