Authorities on the subject of diet say that nitrogen is the most essential of all foods, and that a certain amount—about 316 gr.—should be taken daily by an adult man. If the minimum quantity of nitrogen (which, for the sake of argument, may be put as low as 250 gr.) be not consumed, the various functions of the body languish, and a degree of weakness is induced, with greater or less rapidity, according as the quantity falls much or little below 250 gr. per diem. But let the consumption drop to an average of only 138 gr., which is the smallest amount necessary for the bare maintenance of life, and in a year or two (not at once, for every body contains a store of nitrogen) important modifications of the nutritive processes, with distinct predispositions to disease, will inevitably be established. (Parkes.)
These results of experimental investigation have a practical significance. They find expression in the fact that a failure to consume all the essential elements of full rations, whether nitrogenous or non-nitrogenous, will sooner or later, as in the disastrous Irish and Lancashire famines, give rise to a train of symptoms which have been justly denominated those of “chronic starvation.”
From the small knowledge of the value of food possessed by individuals as well as the public, a diminution in its adequate supply easily escapes attention; loss of appetite is looked upon with indifference, and the first steps are inadvertently taken toward a condition which is as full of meaning in the case of a single person as when a whole community are its subjects. The absence or the keenness of appetite affords no indication of the amount of food which the stomach will digest and the body assimilate or an individual be benefited by swallowing.
The body requires not only to be fed, but filled; and the object of eating is as often to bring up past arrears as to supply present demands. Quality of food, with all the heat and force it may contain, will not make up for quantity, which is required for constructive and reparative purposes. The constant waste of flesh and blood can only be compensated for by an equivalent assimilation of actual materials. Yet, in spite of this self-evident proposition, a large proportion of the better educated classes of the community readily deceive themselves and mislead others in regard to the amount of food necessary for their welfare and nutrition.
From a practice, often beginning in infancy with the common maternal prejudice against giving solid food at a sufficiently early period and in adequate amount, persisted in through childhood from an erroneous idea that “meat once a day” is an ample supply of animal food, still continued during adolescence, especially in the case of girls, under the conceit that eating heartily, or “between meals,” is neither wholesome nor lady-like, a habit of going without enough sustenance is finally established in adult life which is further perpetuated and confirmed by a great variety of influences. Among the more common may be mentioned personal temperament, disturbed mental conditions, languid indoor life, fatigue and exhaustion, theoretical dietetic prejudices, fastidiousness as to eatables, unwise distribution of meals, insufficient variety of food, too rigid domestic economy, and, pre-eminently, the revived fashion of tight lacing. These, and a multitude of similar agencies, apart from pathological derangements, are well-recognised causes of deficient bodily nourishment and prolific sources of disturbed health, revealing themselves in deficient weight, “weakness,” anæmia (want of blood), feeble circulation, neuralgia, cough and throat trouble, constipation, headache, backache, nausea, and a variety of phenomena, unconnected with sensible organic alterations, but characterised by neurotic and functional symptoms easily magnified by the patient and overtreated by the physician.
As testifying to the widespread ignorance relating to food and feeding, the following extract may be quoted from the Medical Times and Gazette, May 24, 1884, p. 712:—“At the existing (1884) International Health Exhibition, London, the ‘Vegetarian Society’ are furnishing a sixpenny dinner to 400-500 people daily. From a carefully kept account of the substances used for the bill of fare the following ‘food equivalents’ have been reduced, showing that each diner receives, of
| Albuminoids | 0·63 oz. |
| Fat | 0·44 oz. |
| Carbohydrates | 3·17 oz. |
| Mineral matters | 0·09 oz. |
Physiologists lay down the standard diet for ordinary labour pretty much as follows:—
| Albuminoids | 4·2 oz. |
| Fat | 1·6 oz. |
| Carbohydrates | 18·7 oz. |
| Mineral matters | 1·0 oz. |
It appears, therefore, that it would require about six of the sixpenny dinners to support a man during a day’s hard labour.”