At what point in Fellowship did the party not being able to see very far with their light sources, or being able to eat or not actually play into their traversal of the Mines? (I'm presuming movie here, as I do not know the books well enough to know the changes.) As far as I can remember... neither of those things came up. The group had torches and light sources that allowed them to see, and we never saw the actually three days of their traversal of them eating, sleeping or whatever.
Instead, it went from story beat to story beat-- getting into the Mines, noticing they were being followed by Gollum, the "skill challenge" of Gandalf deciding which path to take, finding the tomb, the fight within the tomb, the run and jump across the collapsing staircase, the awakening of the Balrog, and the stand-off at the bridge and them running away as Gandalf sacrifices himself.
Now if you wanted to add Darkness and a lack of food into the story... the DM would just need to set up rules within the Mines where Darkvision and Goodberry just don't work. That's completed doable. Now yes, some DMs and players might very well call that "cheating" because the DM is inventing a magic or a lack of magic for this encounter site that "the game rules" don't have in any of the books... but that's why this is 5E and not AD&D. in 5E the DM can just say this encounter site has been so overcome with infernal magic from digging down the the Balrog that any Goodberries produced come up rotten, and the entire Mine is overcome with essentially a Darkness magic that requires magical light sources to illuminate (like Gandalf's staff.)
We do this... and now both of these are part of THIS Story. This one time. Because it is different and original for the party than what they are used to. And that makes it more compelling (to a certain segment of the gaming populace) than having to deal with darkness and food every single in-game day. Because at that point, it's not a Story, it's just a Standard Operating Procedure that every party comes up with when find ways to deal with the exact same issues over and over and over again.