Bukkit

This stat would only be added to food items.

ex. Pork chop with a lore "food: 2.5" would only feed the player 2 and a half chicken leg things (5 food points....). This would be a great feature when using some custom drop plugins and so on.

This would probably work best if the player right clicks on the food item while holding it, it would disappear and give the player the food points.
(this is just a side-idea if the normal way of eating food by holding right click for 3-4 sec doesn't work)

I think that's not possible. 'cause food, as ticks per second, cannot be modified by items that already give stats.