On the undisputed authority of physiologists it is known that all
diseases are made possible by derangement which is favourable to the
propagation of the microbes of disease, or by deposits of inharmonious
matter which are not thrown off.
Derangement of all the substance of the internal body is effected
mainly, and probably entirely, by deposit of indigestible food or of
tissue which is broken down and is not thereafter expelled from the
system by the ordinary means provided for the discharge of waste.
These inharmonious deposits which cause so much direct and indirect
trouble are mainly, and probably entirely, the result of excess of
eating, or of wrong eating, so that the digestive organs of the body
cannot take care of what is forced on them; or, of admitting substances
which they are powerless to make into good blood or discharge by the
regular means provided by nature.
Right eating and right food are, then, the all-important considerations
of health, as far as the tissues are concerned; and, as the tissues are
themselves the stored food or fuel of the brain and the nerve centres,
the importance of perfect nutrition extends to the most vital functions
and interests of life.