Man's physical universe

xanabras

FOODS 735

although the necessity for their presence has been well established;

for example, it has been shown that the cracking of tomatoes as they

ripen can be prevented by the addition of very small amounts of

manganese to the soil.

It has been found that one part of molybdenum per one hundred

million parts of water is essential to optimum tomato growth.

Fig. 314. The effect of adding pulverized limestone at the rate of 4000 pounds

per acre. (Courtesy of the National Lime Association.)

Animals, Like Plants, Require Certain Foods in Definite Amounts for

Normal Growth and Health.

Food is defined as ^' any material which, when taken into the body, will

(a) yield energy, (b) build tissue, or (c) regulate the body processes.''

The human body is composed of only those elements which are

contained in foods which we eat. It is impossible to build normal

healthy bodies from foods which are deficient in certain elements.

The composition of the human body is approximately as follows

Oxygen

Carbon

Hydrogen

Nitrogen

Calcium

Phosphorus

Potassium

Per Cent

65

18

10

3

1.5

1.0

0.35

Sulfur . .

Sodium

Chlorine .

Magnesium

Iron

Iodine .

Traces of other elements.

Per Cent

0.25

0.15

0.15

0.05

0.004

0.00004

The carbon, hydrogen, oxygen, and nitrogen are contained in the

carbohydrates, fats, and proteins. Carbohydrates consist of sugars,

dextrins, gums, and starches. The function of carbohydrates and fats

in the body is to furnish the heat and other forms of energy through

their oxidation by the oxygen taken into the body through the lungs,

forming water and carbon dioxide as by-products. Excess carbohydrates

and fats are stored in the body, chiefly in the form of fat.

Excess weight should be avoided because it materially reduces one's

length of life by overworking the various organs, especially the heart.

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