The Boston cooking-school cook book by Fannie Merritt Farmer
CHAPTER I
124 words | Chapter 2
FOOD
Food is anything which nourishes the body. From fifteen to twenty
elements enter into the composition of the body, of which the following
thirteen are considered: oxygen, 62½%; carbon, 21½%; hydrogen, 10%;
nitrogen, 3%; calcium, phosphorus, potassium, sulphur, chlorine, sodium,
magnesium, iron, and fluorine the remaining 3%.
Food is necessary for growth, repair, and energy; therefore the elements
composing the body must be found in the food. The thirteen elements
named are formed into chemical compounds by the vegetable and animal
kingdoms to support the highest order of being, man. All food must
undergo chemical change after being taken into the body, before it can
be utilized by the body; this is the office of the digestive system.
Food is classified as follows:—
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