It might be considered, therefore, that the total quantity of food consumed, less about 10 per cent. for loss of incompletely oxidised products by the faeces and urine, would represent the nutritive requirements of the body. But upon reflection it will be observed that allowance must be made for the storing up of any assimilated material in the form of fat or other substance which has been in excess of the demands of the body for the immediate production of energy. It was on evidence such as this that Moleschott, Voit, and Atwater determined their various dietary standards. For many years that which held the field, and probably is not yet displaced, was Voit's, giving 118 grams protein, 56 grams dry fat, 500 grams carbohydrate. This may be considered, therefore, the average quantity of food which it is held that the average man ought to eat, and I give it prominence here because of the necessity for fixing some standard for comparison in connection with the alternative proposals to be referred to in subsequent chapters.