I went back quite a few pages in this section and didn't see anything on this, so I figured I'd suggest it.

Sorting food by expiration dates.

If you only have one of a particular food item, you can see the expiration date right on the inventory page. That's all fine and dandy. But if you have a stack of food, you have to click into that stack to see the expiration dates. (I, personally, have a lot of stacks of a lot of food...) There's only a range of 10 days, so making a dropdown list for selecting the date to sort by would be a good option. I'm sure all of the data that would be needed to do the search is there as well, anyways.

Edit: Fixed typos and clarified a tad more.

Others' ideas;

LissaJo (#17833): A "Food expiring tomorrow" option for the "Feed all" button.

Tau : [Maasai] - [200-reds] (#21486): Sorting by number of uses as well as expiration dates.