No treatise on diet will accomplish its task, with less appreciated and applied individuality. For, after all, the last word on diet must accept individuality as a determining factor in any successful application of dietetic principles. Individual differences count heavily in the results obtained through even the most carefully selected and scientifically determined diet. And as the mind holds the key to individuality, and determines its fluctuations, it follows that a rule of greatest importance to be observed, is to remove, from the field of diet, any mental influence arising from personal emotions. The mind plays upon the vital functions of the body as a player upon his instrument, and may introduce with the same effectiveness, the harmonies or discords, which, related to the body, mean health or disease. Mental processes such as anger, envy jealousy, hatred, fear, worry, passionate desires, etc., generate vibrations in the nervous system that are transmitted to the functional centers of the general metabolism, and more or less disastrously interfere with digestion and nutrition. Harmony of mind and body, in thought, word and act, holds the keyboard of life, by and through which the creative forces of health, strength and beauty are diffused and assimilated throughout the human organism. It is only through a harmonious attitude to life that the universality of a remedy, can adjust itself to the individuality of its application.

Furthermore, in its relation to specific foodstuffs such as sweets and acids, the force of individuality must be closely reckoned with. As the nervous individual, by virtue of his high-tensioned, short-circuited polarization, generates a larger percentage of body acidity than the quiet, self-possessed and slow-moving constitution, it follows that the amount of acid which would be beneficial and constructive to the latter, might prove destructive to the former. Hence, it cannot be too emphatically pointed out, that a system of diet, though successful to one patient, should not be regarded as a panacea for every other sufferer, even when the symptoms of the diseases are identical. The theoretical value of a remedy lies, undoubtedly, in the nature of the remedy itself, but its practical value and success, must be looked for in the relation it occupies to the constitutional peculiarities of the patient.