iron. The standard amounts of protein, calcium, phosphorus, and iron estimated as being required daily by the average adult are: protein 70 grams (2½ ounces); calcium 0.67 gram; phosphorus 1.44 grams; iron 0.015 gram. To illustrate, in one serving of milk (½ pint weighing 8½ ounces) there is 11 per cent of the total requirement of protein for the day, or 11 per cent of 70 grams; 43 per cent of .67 gram of calcium; 15 per cent of 1.44 grams of phosphorus, and 4 per cent of .015 gram of iron. The foods for the day should be selected so that they will total approximately 100 per cent in each of these four columns.
Division IV. Regulatory factors. Water, bulk (roughage), and the minerals, calcium, phosphorus, and iron are essential to regulating body processes. Because the minerals and water are also essential to the building of tissue, there is overlapping of these two headings on the chart. Water is taken for the most part as a beverage. Several servings of food furnishing roughage should be chosen.
Division V. Growth and health factors include the vitamins A, B, and C, which are given the marks commonly used by investigators. At least one serving of food marked +++, or two servings marked ++, should be chosen daily from each vitamin column.
Division VI. Energy factors. After adequate amounts of protein, mineral salts, and vitamins have been provided, both well-being and economy demand that at least one-half of the remaining energy (calories) required[ 26 ]
