--
|Lima beans | 570|Rolled wheat | 4175|
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|Beets | 215|Macaroni | 1665|
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57. Varied Diet. The human body is a much more varied and complex
machine than any ever devised by man; personal peculiarities, as well
as fuel values, influence very largely the diet of an individual.
Strawberries are excluded from some diets because of a rash which is
produced on the skin, pork is excluded from other diets for a like
reason; cauliflower is absolutely indigestible to some and is readily
digested by others. From practically every diet some foods must be
excluded, no matter what the fuel value of the substance may be.

Then, too, there are more uses for food than the production of heat.
Teeth and bones and nails need a constant supply of mineral matter,
and mineral matter is frequently found in greatest abundance in foods
of low fuel value, such as lettuce, watercress, etc., though
practically all foods yield at least a small mineral constituent. When
fuel values alone are considered, fruits have a low value, but because
of the flavor they impart to other foods, and because of the healthful
influence they exercise in digestion, they cannot be excluded from the
diet.

Care should be constantly exercised to provide substantial foods of
high fuel value. But the nutritive foods should be wisely supplemented
by such foods as fruits, whose real value is one of indirect rather
then direct service.

58. Our Bodies. Somewhat as a house is composed of a group of
bricks, or a sand heap of grains of sand, the human body is composed
of small divisions called cells. Ordinarily we cannot see these cells
because of their minuteness, but if we examine a piece of skin, or a
hair of the head, or a tiny sliver of bone under the microscope, we
see that each of these is composed of a group of different cells. A
merchant, watchful about the fineness of the wool which he is
purchasing, counts with his lens the number of threads to the inch; a
physician, when he wishes, can, with the aid of the microscope,
examine the cells in a muscle, or in a piece of fat, or in a nerve
fiber. Not only is the human body composed of cells, but so also are
the bodies of all animals from the tiny gnat which annoys us, and the
fly which buzzes around us, to the mammoth creatures of the tropics.
These cells do the work o