(I've never posted a suggestion before so sorry if I did it wrong)
I've seen text from the player character saying that "it's time for food" or something along those lines
There's also some people who have suggested injuries/not being able to regen naturally as a human and whatnot.
So, I have a suggestion of my own. Food/meals that you could either make yourself or buy from NPCs that sell food.
My inspiration for this idea came from a mix of The Legend Of Zelda: Tears Of The Kingdom, and The Witcher 3.
I was interested in the ideas of "not being able to regen" so I feel like The Witcher style food system that allows you to heal over time mixed with the ability to cook your own meals would make for a good way to regen health and also add more content to the game like hunting, fishing, or farming to get the ingredients.
(I had images but idk how to show them also sorry if this is a bad idea I just thought it would be cool since there's also temperature and freezing in cold areas)