Is a ‘superfood’ containing all essential nutrients feasible?

Is it possible that when we have discovered all the nutrients and substances we need in our diet, there be some kind of food that contains all of this in the correct proportions to the average consumption of each? Has this ‘superfood’ been attempted? Is it not economical, have we not discovered enough about the human diet to know what well need in it, or is it just not possible?

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