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Live for how long?We could certainly live a short while like so, and none of us are immortal (and both statements are true of cattle and sheep).Cattle and sheep (and most herbivores) have bacteria, and other means, to obtain more food from grass than we could. I suppose one analogy would be that cattle feed the grass to bacteria in their intestines, which then extracts the nutrients which help the cow survive. We feed the grass to cows (who are feeding it to their bacteria) which then extracts the nutrients that when we feed of the cattle we can then survive. So, I suppose the difference is that we externalise what a cow internalises.The other difference is that we have a very greedy organ, a massive brain, that needs far more nourishment than the counterpart in a cow; so we have discarded (or, more accurately, outsourced) many of the inefficient parts of the process of obtaining nutrients (i.e. let the cow chew the cud, and spend all its life doing that, and so concentrating all of the goodness from that, and thus allow us to obtain more concentrated nutrients from the cows flesh, while allowing us also to obtain benefit from the more highly concentrated and digestible vegetable matter, such as fruits.
"could we eat only one type of food and live?"For a while we do. It's called milk.