Oh right, I just remembered that Norway did make something like “bark bread” in the past during famines, and that linked Wikipedia article says:
The inner bark is the only part of a tree trunk that is actually edible; the remaining bark and wood is made up of cellulose, which most animals, including humans, cannot digest.
Oh right, I just remembered that Norway did make something like “bark bread” in the past during famines, and that linked Wikipedia article says: