"The chief reason we cannot live on fruits is that they contain practically no protein. This is also one reason why adding them to the average diet is beneficial, for the average diet is too rich in protein. Going on a fruit diet is 'cleansing' chiefly because it is a protein fast, and most of the accumulated wastes and poisons of the body are of a protein nature."

Dr. Gibson says of the nut and fruit diet: "In the light of the latest notations in the Science of human nutrition, there is no activity in the human system, no process of digestion, assimilation, and nutrition, no nervous expenditure or structural strain, that cannot be sustained and maintained to its highest constitutional potency by a judicious dietetic balance of fruit and nuts. The former gives it Sugar for the maintenance of fats and heat of the system; its organic salts to sustain the chemical composition and metabolic balance of the blood; its acids for breaking up tissue congestions, due to accumulation of waste matter; while the nut, with its storage of nitrogen and fat, furnishes material for anatomic repairs, and lubrication of the various joint movements. Finally the carbons contained in both the fruit and nut unite to generate the cerebro-vital explosions which set free the energies of high tensioned nervous life."