The human body does technically require certain amounts of nutrition.

[for a pretty boring and shitty diet his whole life, cassian isn't in terrible shape, but he chalks that up to all this infinite training. he knows proteins and veggies and all that important stuff, but sometimes you just gotta eat gross things to stay functional.]

It's likely all just meant to be convenient. [doesn't mean it is, of course. he glances at her again, a little curious.] What does your food come in usually, if not packets?