The ways in which these food principles
contribute to the growth and health of the body, as well as the ordinary
foods that supply them in the greatest number, are tabulated in Table II
for easy reference. This information will assist the housewife
materially in the selection and preparation of food for her family;
consequently, close attention should be given to it and constant
application made of it.
33. As has already been learned and as will be noted here, a food
substance often has more than one use in the body. For instance, protein
builds tissue and also yields energy, but its chief work is that of
building tissue, and so it is classed first as a tissue-building food
substance. The fats and carbohydrates also have a double use in the
body, that of producing heat and energy and of building fatty tissue.
However, as their chief use is to produce heat and energy, they are
known principally as heat-producing foods. Mineral matter not only is
necessary for the building of bone and muscle, but also enters into the
composition of the blood and all the fluids in the body. Growth and
development are not ideal without an adequate supply of the many kinds
of these salts, which go to make up the tissues, nerves, blood, and
other fluids in the body.
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