Since the cause of most deficiency diseases has been established, and since an efficacious and easily available cure has been found to exist in the observance of what is now regarded as a protective and well balanced diet, there is a strong tendency to regard these diseases as belonging to the bygone prescientific ages. This, together with the fact that ill health may be produced by deficiency of a food factor in amounts much smaller than those necessary to create the typical full-blown picture associated with its lack, explains why the deficiency syndromes are more common than their diagnosis. It is to be expected, therefore, that deficiency syndromes may occur in persons existing for any considerable length of time on a restricted diet, either therapeutic or voluntary, or as a result of dietary eccentricities.
Davidson1 reported three cases of deficiency disease in patients on a diet prescribed for ulcer.
DRY TJ. AVITAMINOSIS IN NATIVES OF RHODESIATREATMENT OF EPIDEMIC SCURVY BY THE INTRAVENOUS INJECTION OF CITRUS. Arch Intern Med (Chic). 1933;51(5):679–691. doi:10.1001/archinte.1933.00150240038003
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