. A civic biology : presented in problems. Biology; Sanitation. I corn .3 I meat S I 2/Ai \ Scents. 274 FOODS AND DIETARIES ing up or repairing tissue. It is certainly true that in both plants and animals such foods pass directly, together with foods contain- ing nitrogen, to repair waste in tissues, thus giving the needed proportion of carbon, oxygen, and hydrogen to unite with the nitrogen in forming the protoplasm of the body. Inorganic Foods. - - Water forms a large part of almost every food substance. It forms about five sixths of a normal daily diet. The human body, by weight, is about t
. A civic biology : presented in problems. Biology; Sanitation. I corn .3 I meat S I 2/Ai \ Scents. 274 FOODS AND DIETARIES ing up or repairing tissue. It is certainly true that in both plants and animals such foods pass directly, together with foods contain- ing nitrogen, to repair waste in tissues, thus giving the needed proportion of carbon, oxygen, and hydrogen to unite with the nitrogen in forming the protoplasm of the body. Inorganic Foods. - - Water forms a large part of almost every food substance. It forms about five sixths of a normal daily diet. The human body, by weight, is about two thirds water. About 90 per cent of the blood is water. Water is absolutely essential in passing off waste of the body. When we drink water, we take with it some of the inorganic salts used by the body in the making of Three portions of foods, each of bone and in the formation of proto- which furnishes about the same lagm Sodium chloride (table amount ot nourishment. salt), an important part of the blood, is taken in as a flavoring upon our meats and vegetables. Phosphate of lime and potash are important factors in the forma- tion of bone. Phosphorus is a necessary substance for the making of living matter, milk, eggs, meat, whole wheat, and dried peas and beans containing small amounts of it. Iron also is an extremely impor- tant mineral, for it is used in the building of red blood cells. Meats, eggs, peas and beans, spinach, and prunes, are foods containing some iron. Some other salts, compounds of calcium, magnesium, potassium, and phosphorus, have been recently found to aid the body in many of its most important functions. The beating of the heart, the contraction of muscles, and the ability of the nerves to do their work appear to be due to the presence of minute quantities of these salts in the body. Uses of Nutrients. The following table sums up the uses of nutrients to man : l 1 Adapted from Atwater, Principles of Nutrition and Nutritive Value of Food, Department
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