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In principle, people can eat grass; it is non-toxic and edible.
There are two main problems with a grass diet.
The first is that human stomachs have difficulty digesting raw leaves and grasses.
Moreover, eating grass has zero of the nutritional value for humans it does for cows, yaks, deer and sheep.
Animals such as cows, on the other hand, have a specialized stomach
with four chambers to aid in the digestion of grass (a process called rumination).
Aside from the digestion issues, a second problem with grass as a food source is the mastication.
Your dentist would not be pleased; grass contains a lot of silica, an abrasive which quickly wears down teeth.
Grazing animals have teeth that are adapted to continually grow, replacing the worn tooth surfaces quickly.
Interestingly enough, there was a period in history when humans could digest grass.
That was around 3.5 million years ago.
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