There are many concerns about the usefulness of pigs...
So here's a fun idea:
Butchering an adult pig could possibly wield an unit of bacon. The greater the pig's quality, the more the chance to get it.
Bacon could then be roasted on a campfire/in an oven and once finished, it could be added to any food item by right clicking - just like Black Pepper - to dramatically increase FEP gains.
And when I say dramatically, I mean like 2~3 times better than pepper. However, as a 'price', bacon also increses the food's hunger gain.
Because it's bacon
