The recently published paper by Conrad A. Elvehjem1 on the importance of food in preventive medicine reveals clearly the need for applying adequate nutritional standards to all populations. Nutrition has become so important that it cannot be regarded casually; on the contrary, it must always be remembered in most, if not all, thorough diagnostic and therapeutic procedures. Today one can even speak of food therapy, since the word food embraces such a broad field, since food has been broken down into many substances, and since these substances can be applied specifically for treatment as well as for the prevention of nutritional disorders. In fact, they are often used in what at first seem to be unrelated health problems; however, further study would reveal the reasons for such therapy and at the same time would indicate the complexity and scope of modern nutritional practices.
Nutritional deficiency cannot be regarded, as