WAR INEVITABLY brings into focus problems of nutrition. The recent conflict, because of its global character and attendant malnutrition, added great impetus to the already expanding science of nutrition. The United Nations Conference on Food and Agriculture1 in May 1943 found the evidence convincing that malnutrition was "responsible for widespread impairment of human efficiency and an enormous amount of ill health and disease." Recent progress in the study of nutritional elements fires the imagination. Vitamins have been produced in pure and concentrated forms and their functions more clearly defined; the essential nature of fats has been demonstrated, and the role of proteins and minerals has been more fully clarified. But, more important, there has come an understanding of the deficiency state, with a fuller appreciation of the frequency with which these states impair tissue functions and man's usefulness. Unfortunately, the methods of diagnosis of nutritional abnormality remain inadequate; no