acquire open can of beans/spaghetti/tuna/sardines or rice/cereals, a bottle of water or canteen, anything that has multiple portions of food/water in it
open inventory
right click item, left click "eat/drink"
close inventory (quickly)
spam use key (F in my case), and I mean SPAM until it says "there is nothing left"
observe as the item has gone out of your inventory (or stays in at 0%) but apparently your stomach will not be as full as it should be