Why can't humans eat trees?

Grass, leaves, and other plant materials provide plenty of metabolic energy for cows, goats, sheep and other ruminants. However, this kind of plant material is indigestible for humans. read more

Humans can digest the leaves, fruit, roots and sap of many trees. Some bark of some trees are edible and rich in nutrients. The human stomach can’t digest wood inside a tree as we lack the enzymes to break down the cellulose in the wood. read more

People can definitely eat acorns, and some do, but they do typically require a certain amount of preparation in order to be palatable. The acorn is an extremely abundant nut, but most people rarely consider it as a potential source of food. read more