But in the potato there is only one part in one
hundred for muscle, and nine tenths of one part of phosphorus for brain
and nerves.
The articles containing most of the three articles needed generally
in the body are as follows: for fat and heat-making--butter, lard,
sugar, and molasses; for muscle-making--lean meat, cheese, peas, beans,
and lean fishes; for brain and nerves--shell-fish, lean meats, peas,
beans, and very active birds and fishes who live chiefly on food in
which phosphorus abounds. In a meat diet, the fat supplies carbon for
the capillaries and the lean furnishes nutriment for muscle, brain,
and nerves. Green vegetables, fruits, and berries furnish the acid and
water needed.
In grains used for food, the proportions of useful elements are varied;
there is in some more of carbon and in others more of nitrogen and
phosphorus. For example, in oats there is more of nitrogen for the
muscles, and less carbon for the lungs, than can be found in wheat.
In the corn of the North, where cold weather demands fuel for lungs
and capillaries, there is much more carbon to supply it than is found
in the Southern corn.
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