How can I know the total stock of a certain food?

Kiff handles the same food with different due dates as separate items (cards). But you can know, at any time, how much stock of that food you have by accessing the food detail of any of them and checking the stock area.

The large number indicates how many units there are with that specific due date. The caption, however, shows how many units of this particular food are in total, regardless of when they will expire stop being fresh. Representation example: 3 unds. in total.