I know some guys- Otter and Junebug and Jughead, only the state knows their real names, I guess- who live in the woods most of the year. Like, deep within no-car-access land on the border of the Hiawatha national forest. They take provisions, but since they have to cart in their tools (they build furniture and cut pulpwood, not to mention firewood to keep warm and heat water), they don't take much. They eat nuts, cattail roots, fish, fiddlehead ferns, wild mushrooms. One of their staples is soaked, dried acorns and dried grasshoppers. These are ground up into flour, mixed with water and cooked like pancakes. They usually don't bother with reduction boiling, and just put maple sap on them.
Yeah, they are all skinny.