What about humans? I remember a plot point in a science fiction novel being that kudzu is technically edible, if not particularly interesting - and thus, a lar

What about humans? I remember a plot point in a science fiction novel being that kudzu is technically edible, if not particularly interesting - and thus, a large famine was averted. If we could do the same to grass... (I won't name the novel, because although it's only a minor plot point, I don't particularly want to spoil it.)