Woman with light muscular exercise 90 2400 5.5 Woman with moderate muscular work } 100 2700 5.6 Man without muscular work } Man with light muscular work 112 3000 5.5 Man with moderate muscular work 125 3500 5.8 Man with hard muscular work. 150 4500 6.3 =The Relation of Food Economics to Social Welfare.=—A virile nation is one whose citizens are of a good physical type, which means that they are well nourished. A well-fed people, other conditions being favorable, is a strong people. Food is the physical basis not only of the individual activity, but also of social energy. Any causes, therefore, which limit the food supply or increase the burden of securing adequate nourishment strike a blow at the nation’s vital power. We must constantly keep in mind that the energy output is practically the energy requirement, under given conditions, of course; and the expenditure caused by the muscular activity of a particular individual cannot be reduced without affecting the work done or causing the loss of body substance. Investigation has shown that there is a necessary daily protein minimum use. When insufficient protein is taken in the food, the necessary balance will be supplied by drawing on the tissues of the body. The food standards which are based on the observation of practice call for not less than 100 grams of protein daily for professional men and 175 grams for men at severe labor. It is held to be significant that communities holding leading positions in the world consume a liberal amount of protein, or, conversely, that communities with an inferior physical and mental status use a low proportion of proteins in the diet. Again, if we argue from the analogies in feeding farm animals, generous protein feeding is desirable for the growth and maintenance of vigorous organisms and a satisfactory rate of production. On the other hand, the well-known experience of the ages has shown that the poor who live on a low protein diet are the most liable to disease. It cannot be gainsaid that the meat eater has greater stamina and energy than the one whose diet is poor in protein. The conclusion is, that while a minimum of protein is essential to the organism, a greater proportion is advantageous by acting as a stimulant to the metabolism and as a ready source of energy; that people are better for the consumption of proteins in quantities greater than in Chittenden’s standard, and possess greater resistance to disease, probably because the body is stimulated to manufacture antibodies. =Practical Facts for Guidance.=—The housewife who keeps the following facts in mind may combine foods in an approximate way that will fully meet the demands of the human organism. The proper ratio is 1 part of protein to 5 parts of non-protein; and the fat should equal one-half of the weight of the protein. This gives the following normal dietary: