It is quite impossible, however, to make a hard and fast rule in this matter. Every individual differs from others in his requirements. Moreover, the weather, the season of the year, the amount and kind of work done, are all factors in the situation. Hard physical work and exposure to cold demands the largest food supply. A person who naturally perspires freely needs more food than a person who does not, because of the large amount of heat carried off from his body by the evaporation of sweat from the skin. Adults require food chiefly to repair waste and losses. Growing children require in addition to food to repair waste and losses, material for tissue building. According to the best authorities upon the diet of children, a growing infant utilizes fully one-third of its total intake of food in tissue building. When an adult becomes emaciated he requires more tissue building material than the normal adult, his need for it being practically the same as that of a growing child. We give below a table showing the average number of food units or calories required daily by people of various heights and weights. This table is one drawn up by Dr. J. H. Kellogg, Superintendent of the Battle Creek Sanitarium. In calculating the number of calories required in a given case, the estimate should be based not upon the actual weight of the individual, but upon the weight of the average person of his height. “Persons who are in good health,” says Dr. Kellogg, “and find their weight somewhat greater than the figures given in the table, should not necessarily consider themselves obese. While above the average in weight, their condition is probably natural, and no attempt should be made to reduce the weight to any considerable amount, as injury may result. The average for adults applies especially to healthy adults between twenty and thirty years of age. Most people who are above forty years of age have a natural tendency to increase of flesh, which requires no attention unless it becomes excessive. Any reduction in foods made by an obese person should be in carbohydrates rather than in proteids or fats, unless these latter have been taken in excess.” TABLE NO. 1 Showing for different ages the average height, weight, and the number of food units or calories required daily. _Boys_ Height in Weight in Calories or Age Inches Pounds Food Units 5 41.57 41.09 816.2 7 45.74 49.07 912.4 9 49.69 59.23 1,043.7 11 53.33 70.18 1,178.2 13 57.21 84.85 1,352.6 _Girls_ Height in Weight in Calories or Age Inches Pounds Food Units 5 41.29 39.66 784.5 7 45.52 47.46 881.7 9 49.37 57.07 1,018.5 11 53.42 68.84 1,148.5 _Men_