Only if you are able to track the deficiency back to its cause. To reuse scurvy, how many realized that their deficiency was of fresh fruits and vegetables? As opposed to bad air or bacterial poisoning or whatever… If you felt the symptoms of rabbit starvation but had never heard of it or been told about it, would you realize what the problem was in your diet before you happened to eat something fatty and noticed your vague hunger was finally satisfied?
Not to mention, worst case scenario, if you experience a deficiency, you are still in civilization and may switch back to a normal diet.
Only if you are able to track the deficiency back to its cause. To reuse scurvy, how many realized that their deficiency was of fresh fruits and vegetables? As opposed to bad air or bacterial poisoning or whatever… If you felt the symptoms of rabbit starvation but had never heard of it or been told about it, would you realize what the problem was in your diet before you happened to eat something fatty and noticed your vague hunger was finally satisfied?