He looks down at what she's indicating, then looks up at her face again, and frowns. "Yeah. That's... definitely not enough for you. We'll stop by a diner on our way. It's pretty cheap, but it should be filling." It might not be the most nutritious, but it'll have a good meal for her.

Maybe he won't be able to eat tomorrow, but she's still growing. She needs it more than he does. "Don't worry. You'll be okay." ... He can only hope, at least.