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>  Logic tells me obviously that humans aren't meant to eat grasses, but
> the particular ones are so packed with nutrition, it is hard to deny
> them nonetheless.  Some proponents of them just refer to them as
> another land vegetable.

Simplest explanation (some might say simplistic) is that we do not have the
digestive "tools" to process grasses. So, we get them second hand by eating
animals who do possess those tools. In other words, we let animals
"pre-digest" grasses for us.

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