Even carnivorous animals nourish on a diet of nuts with other vegetable foods and cooked cereals. The Turks mix nuts with their pilaff of rice and the Armenians add nuts to their baalghoor, a dish prepared from wheat which has been cooked and dried.
That nuts are not only competent to serve as a staple food, but that they may fill a very important place as accessory foods in supplementing the imperfect proteins of the grains and vegetables is shown in a very conclusive way by an extended research by Dr. Hoobler, of Detroit.
Before describing Dr. Hoobler's experiment I may be allowed to explain that some years ago, in 1899, I was asked by the then United States Secretary of Agriculture to undertake experiments for the purpose of providing a vegetable substitute for meat. Dr. Dabney said there was no doubt that the time would come when such substitutes would be needed on account of the scarcity of meat. I succeeded in developing several products which have come to be quite widely known and used more or less extensively in this country and Europe. Among these were Protose (resembling potted meat) and malted nuts, a soluble product somewhat resembling malted milk. It was noted that the malted nuts when used by nursing mothers greatly increased the flow of milk and promoted the health of the infant. Recently Dr. Hoobler undertook an extensive feeding experiment with nursing mothers and wet nurses as subjects. He made use of these nut preparations as well as of ordinary nuts and compared the results with various combinations into which meat and milk entered in various proportions. He found that a diet of fruits, grains and vegetables alone gave a very poor quality of milk, but when nuts were added the result was a milk supply superior in quantity and quality to any other combination of foodstuffs, not excepting those which included liberal quantities of milk, meat and eggs. From this it appears that nuts possess such superior qualities as supplementary or accessory foods that they are able to replace not only meats, but even eggs and milk in the dietary. The full account of Dr. Hoobler's interesting observations will be found in the Journal of the American Medical Association for August 11, 1917.
Extensive feeding experiments are now being conducted at the research laboratory of the Battle Creek Sanitarium, which it is hoped will develop still other points of interest respecting the superior nutritive properties of the choicest and most remarkable of all the food products which are handed to us from the fertile laboratory of the vegetable world.
Another and most interesting phase of my subject is the relation of nut feeding to anaphylaxis. This newly coined word perhaps needs explanation for the benefit of my lay hearers. For many years it has been known that some persons were astonishingly sensitive to certain foods which indeed appeared to act as violent poisons. Oysters, shellfish, mutton, fish and other animal products, as well as a few vegetable products, especially honey, strawberries and buckwheat, were most likely to be the cause of these violent disturbances. More recently it has been found that cow's milk very often shows the same peculiarity. It is now known that this remarkable phenomenon is due to the fact that the body sometimes becomes sensitized to certain proteins which thereafter act as most violent poisons and may cause death. Sensitization to animal proteins is much the more frequent. In such cases nut products become a very precious resource. This is especially true with reference to cow's milk.
Liquid nut preparations have saved the lives of hundreds of infants within the last twenty years. I have had the pleasure of meeting several fine looking young people who owed their lives to nut-feeding when other resources had failed. One case was particularly interesting. A telegram from a well-known Senator at Washington announced the fact that his infant daughter and only child was dying from mal-nutrition, as cow's milk and all the known infant foods had been found to disagree. I advised nut-feeding, and fortunately the prescription suited the case and the little one began to improve at once. When the physician in attendance learned that the child was eating nuts he vigorously protested, declaring that such a diet was preposterous and would certainly kill the infant, but the child flourished wonderfully on the liquid nut diet, eating almost nothing else for the first three years of her life, and today is a splendidly developed young woman, a brilliant witness to the food value of nuts.
I have by no means exhausted the physiologic phases of my subject, but will now turn a moment in concluding my paper, to its economic aspects.
The high price of nuts is constantly urged as an objection to their use as a staple. It is probable that a largely increased demand would lead to so great an increase in the supply that the cost of production, and hence the cost to the consumer, would be decreased. But even at the present prices the choicest varieties of nuts are cheaper than meats if equivalent food values are compared. This is clearly shown by the following table which indicates the amounts of various flesh foods which are equivalent to one pound of walnut meats.
| Beef loin, lean | 4.00 | pounds |
| Beef ribs, lean | 6.50 | " |
| Beef neck, lean | 9.50 | " |
| Veal | 5.50 | " |
| Mutton leg, lean | 4.20 | " |
| Ham, lean | 3.00 | " |
| Fowls | 4.00 | " |
| Chicken, broilers | 10.00 | " |
| Red bass | 25.00 | " |
| Trout | 4.80 | " |
| Frogs' legs | 15.00 | " |
| Oysters | 13.50 | " |
| Lobsters | 22.00 | " |
| Eggs | 5.00 | " |
| Milk | 9.50 | " |
| Evaporated cream | 4.00 | " |
But the great economic importance of the encouragement of nut culture in every civilized land is best shown by comparing the amount of food which may be annually produced by an acre of land planted to nut trees and the same area devoted to the production of beef. I am credibly informed that two acres of land and two years are required to produce a steer weighing 600 pounds. The product of one acre for one year would be one-fourth as much, or 150 pounds of steer. The same land planted to walnut trees would produce, if I am correctly informed, an average of at least 100 pounds per tree per annum for the first twenty years. Forty trees to the acre would aggregate 4,000 pounds of nuts, or 1,000 pounds of walnut meats. The highest food value which could be ascribed to the 150 pounds of beef would be 150,000 calories or food units. The food value of the nut meats would be 3,000,000 calories, or twenty times as much food from the nut trees as from the fattened steer, and food of the same general character, protein and fat, but of superior quality.