Could humans survive off a single food block

Could humans permanently live off a single food-like block, made of various edible materials, which contains all their daily requirements of calories, vitamins, and minerals?

Preferably is there a way for this food block to be in a dehydrated state, allowing it to be as portable as possible (only requiring the person to add water for consumption)?

How long would the shelve life be, preferably while being stored unrefrigerated?

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Could humans survive off a single food block

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