The Field Museum has two restaurants, and a good space for eating food you bring in. And, when there's good weather in the summer, you can grab food at a small restaurant outside. For all three options, I encourage you to get lunch early: be there by 11:30 at the latest, although that's particularly the case if you're buying food at the Field Museum.
The Field Bistro is a little like a food court, with trays and separate stations to pick up food. You'll then pay all together and then walk to the tables. Although a line usually forms at the first station, you only need to wait there if you're ordering food that needs to be prepared at that station. Often there are grilled cheese sandwiches (highly recommended for kids) and other food sitting out and ready to be grabbed. The next station has soup and salads, which are pretty good. Along the way, there are sides like whole fruit and fruit cups, as well as bottles of beer and one-person bottles of wine(!). Keep an eye out on cookie prices, I've grabbed a treat that cost more than $10 (fortunately the cashier double checked that I knew the price so I could swap it out for a cheaper treat). Take your tray to a table, ideally to the left of the pay stations, putting you out into the beautiful Stanley Field Hall, but if those are full there is additional seating behind the cashiers.
The Explorer Cafe is a little easier and kid-oriented, although with many fewer healthy adult options. It feels much more like a fast food restaurant, where you go to a cashier to order, and then grab a table until your buzzer goes off. It's not as nice, but a little cheaper, and the logistics are easier, particularly if you just have one adult: you can get kids seated before you need to go back up and carry your tray of food when it's ready. Because it is next to the 3-D movie theater, it will quickly get swamped after a movie gets out.
Menus for both restaurants are in the More Information section.
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