Part 2 (2/2)

1 oz. Protein (dry) = 120 C.

--about 113 in the body.

1 oz. Carbohydrates (dry) = 120 C.

--about 113 in the body.

(ROSE.)

Can you see now why fats are valuable? Why they make fat more than any other food? They give off more than two and one-fourth times as much heat, or energy, as the other foods.

[Sidenote: _See Next Chapter for Definitions_]

Notice that protein and carbohydrates have the same food value as to heat or energy, each 113 Calories to the dry ounce. However, they are not interchangeable; that is, carbohydrates will not take the place of protein for protein is absolutely necessary to build and repair tissue, and carbohydrates cannot do that. But fats and carbohydrates are interchangeable as fuel or energy foods.

_Calories Needed per Day for Normal Individuals_

[Sidenote: _Business of Growing_]

This depends upon age, weight, and physical activities; the baby and the growing child needing many more calories per pound per day than the adult, who has to supply only his energy and repair needs. The aged require still less than the young adult. As to weight; I have told you why overweight individuals need so little. As to physical activities; the more active, obviously the more calories needed, for every movement consumes calories.

[Sidenote: _Many Know Nothing of This_]

The Maine lumbermen, for instance, while working during the winter months, consume from 5000 to 8000 Calories per day. But they do a tremendous amount of physical work.

_Mental work does not require added nourishment._ This has been proved, and if an excess be taken over what is needed at rest (if considerable exercise is not taken while doing the mental work) the work is not so well done.

[Sidenote: _Calories Required for Normal_]

Per pound per day

Infants require 40-50 C.

Growing Children 30-40 C.

Adults (depending upon activity) 15-20 C.

Old age requires 15 or less C.

_In Round Numbers for the Day_

Child 2-6 1000 to 1600 C. per day Child 6-12 1600 to 2500 C. per day Youth 12-18 2500 to 3000 C. per day

[Sidenote: _Growth Demands_]

(Remember that in general the boy needs as much as his father, and the girl as much as her mother.)

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