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If a healthy person stopped eating anything but powdered starch, or sugar (i.e. nothing but carbohydrates) what would he die of first? The vitamin deficiencies that people get most often, they get because those vitamins are hard to come by. For instance, vitamin E is everywhere in nature, and people almost never die of deficiency.

But suppose someone cut vitamins and minerals (and protein and fat) out of his diet altogether. Would he die of protein deficiency? I don't think protein deficiency even has a name. Is there such a thing as fat deficiency? I guess you could calculate how fast each nutrient is used in the body, and how much we start with, and extrapolate, but the curve would probably be non-linear in a dying man. I cannot believe that this has not been studied in rats.