We overwork our body inside when we do not give it its due amount of
fresh air. The blood needs the oxygen to supply itself and the
nerves and muscles with power to do their work. When the oxygen is
not supplied to the blood, the machinery of the body has to work
with so much less power than really belongs to it, that there is
great strain in the effort to do its work properly, and the effect
is, of course, fatigue.
In either of the above cases, both with an overworked stomach and an
overworked heart and lungs, the complaint is very apt to be, "Why am
I so tired when I have done nothing to get tired?" The answer is,
"No, you have done nothing outside with your muscles, but the heart
and lungs and the stomach are delicate and exquisite instruments.
You have overworked them all, and such overwork is the more
fatiguing in proportion to what is done than any other form, except
overwork of the brain." And the overtired stomach and heart and
lungs tire the brain, of course.
Of the work that is given to the brain itself to overtire it we must
speak later. So much now for that which prevents the body from
keeping rested inside, in the finer working of its machinery.
It is easy to find out what and how to eat. A very little careful
thought will show us that. It is only the plain common sense of
eating we need. It is easy to see that we must not eat on a tired
stomach, and if we have to do so, we must eat much less than we
ordinarily would, and eat it more slowly.
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