Of all your food, only sausages is "appropriate" for the swamps. All the other food is already either Mountain or already Plains food (which is currently "endgame").

In the swamps I used sausages, boar jerky, and whatever stamina food I could get. This served me pretty well. Now, I'm in the mountains, and I still use sausages, but also wolf skewer as health food, wolf jerky as alround base food and eyescream as stamina food.