The stomach and other hidden parts of the body have automatic functions
independent of the will that perform digestion; these functions
are beyond the scope of control, and hence means of preventing
ill-digestion must be studied by the aid of the exterior sensations.
Sight, Appetite, Touch and Taste are the senses useful in selection of
food and in the prevention of indigestion.
Sight and Appetite relate to invitation and selection, while Touch and
Taste are discriminators and indicators of conditions.
Appetite and Taste are the sense functions that are most important to
health, and hence they are the most important to study and understand.
They are the guide in nutrition and the guard of the body machine--the
Mind Power-Plant.
Smell also is an important aid in selection and discrimination and is
an effective assistant of Appetite.