If I recall correctly this was a feature in the original Spice of Life, or at least in one of its derivatives.

It would be wonderful if you could add either a lunchbox item or a number of different tiers of lunchboxes. These would be items with their own inventories which can only hold food items. While holding a lunchbox you could right click to eat an item from it. The most effective food item, taking into account your most recently eaten foods, would be selected from the lunchbox for you to eat. You could open the lunchbox gui with a right click while sneaking.

This would make it more convenient to deal with needing to consume (and therefore needing to carry) a variety of different foods, and would remove the need for players to put effort into tracking which specific food they should eat next.

If you were to add only one lunchbox, I think that somewhere from 5 to 10 slots would be a fair capacity. I think that a higher tier lunchbox could reasonably have up to 20 slots.

Well, I originally planned to do that but refrained from it because I allowed this project to be used server-side only.

I might wanna try Polymer to implement this in the future.
5 slots would be nice cause I could just use the hopper gui for it :)