Without doubt, the greatest problem confronting the human race is
that of food. In order to exist, every person must eat; but eating
simply to keep life in the body is not enough. Aside from this, the body
must be supplied with an ample amount of energy to carry on each day's
work, as well as with the material needed for its growth, repair, and
working power. To meet these requirements of the human body, there is
nothing to take the place of _food_, not merely any kind, however, but
the _right_ kind. Indeed, so important is the right kind of food in the
scheme of life that the child deprived of it neither grows nor increases
in weight, and the adult who is unable to secure enough of it for
adequate nourishment is deficient in nerve force and working power. If a
person is to get the best out of life, the food taken into the body must
possess real sustaining power and supply the tissues with the necessary
building material; and this truth points out that there are facts and
principles that must be known in order that the proper selection of food
may be made, that it may be so prepared as to increase its value, and
that economy in its selection, preparation, use, and care may be
exercised.
2. Probably the most important of these principles is the _cooking of
food_. While this refers especially to the preparation of food by
subjecting edible materials to the action of heat, it involves much
more.
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