There are a lot of moving parts to this, but I think RAW the answer is "Yes, with restrictions."
Other users have pointed out that, per the text of Creation, the food conjured must be unambiguously vegetable matter and not alive; that's easy enough. Most people seem to be hung up on whether or not any of the nutrition sticks with you, though, and that's the tricky part. There's no part in the spell that says "any benefit gained from the material is lost when the spell ends," or anything to that effect, so the core question (by my reckoning,) then becomes "What distinguishes this food from normal food?" As far as I can tell: nothing.
The spell specifically states that it uses wisps of Shadowfell material to "Create" an object. Not to mimic an object's properties; to create one. Now in the real world, we clearly understand conservation of mass: when the object disappears it should disappear from everywhere, even on the smallest level, no matter where it is. But DnD isn't the real world, conservation of mass clearly doesn't apply or half the spells in this game would be impossible: and as a game governed by rules the only relevant rule is that you must consume one pound of food a day. Doesn't matter if it's mundane, magical, meaty, vegetarian, vegan, preserved, organic, or even made of shadowstuff, you just need a pound a day (PHB, pg 185.)
This (barely,) edges into "Create Food and Water"'s territory, but a spell somewhat mimicking the effects of a lower level spell of a different class is hardly newsworthy in 5e. I don't see why you couldn't describe "a crate of lettuce," as an object, but a ration is specifically listed as an object in the PHB; so that should be the absolute smallest unit of food you're able to create per casting.
The real answer, as ever, is to consult with your DM and discuss expectations beforehand, but RAW I can't see anything that expressly forbids it or incurs consequences.