Luke's response to Misa gets something akin to a laugh from him. "She'd rather eat her hand." Not that there were many rations aboard his ship - he didn't need them and stormtroopers carried their own. There'd be enough for one person, barely, and not split between two people. One of which needed calories due to healing him.

"And I'm not sure the Alliance will share an expensive supply with me. That's what she's worried about." It would serve him right to be refused, he knows. "I'll be fine without it for a while. It's not the first time I've had to wait." After Palpatine turned his temper on him, he means. No need to say that - he'd rather Misa have never known. He doesn't want Luke to know those details.

"She's correct in that you both need to eat."