If you force feed someone with any food, let's say can of beans, and while force feeding you open your inventory and drop the clothing piece which stores the food item. After you drop your piece of clothing which stores the food, the guy you were force feeding gets the benefits of eating the food, and you can pick your piece of clothing back up and you still have the same food at 100%, even thought the guy got fed.

In example: Player X has pants with 4 slots, only thing in his pants are an open can of beans (100%). You find a friend who is starving, you then force feed him, while in the animation you go to your inventory then drop your pants which store the beans. After the animation ends and you sucsessfully force feed him you can pick your dropped pants back up and you still have the food item at 100% and you have fed your friend.