The suggestion is in the title, basically.
There comes a point where all 4 consumable item slots will have combat potions in them (Health, Mana, Stamina and Rejuvenation). While buff food does not go in sacks, the plain food (i.e. 3 of the 4 foraging mats in every tier) does, and is needed to top off health and/or mana when out of combat.
Because of the action of the stack button, if you try to keep a separate stack outside of the bag for eating, it will disappear back into the bag the next time you use the stack button (which I use all the time).
So, if a sack contains an edible food, the right-click context menu should contain an "Eat" option, and it would be better if it's at the top of the list at the safe end. (Or, if it's easier, the context menu could always has the "Eat" option, but it is disabled when the sack does not contain food.)