80 
been used by the fruitarians studied, the diet would have been enriched 
and the cost decreased. 
The almond, so much in favor with fruitarians, furnishes for 10 
cents about one-third the protein and less than one-half the energy 
supplied by peanuts. 
SUMMARY. 
A review of the results of the studies of the fruit and nut diet seems 
to bring out the following points of interest perhaps more promi- 
nently than some others: 
While some of the dietaries make it plain that it is possible to obtain 
the requisite amount of protein and a proper fuel value from a fruita- 
rian diet, still the majority of those studied fell far below the tentative 
standards. At the same time it is not just to ascribe this entirely to 
the form of diet. These same people might have consumed no larger 
quantities of nutrients on a mixed diet. 
The nutritive value of the fruitarian diet is shown most clearly in 
the case of the university student, who, though entirely unaccustomed 
to such fare, gradually changed from an ordinary mixed diet to one of 
fruit and nuts without apparent loss of health or strength. He was 
then able for eight days to carry on his usual college work and also for 
part of the time to perform heav} T physical work on an exclusively 
fruitarian diet without any material loss in weight. 
It would seem from the data that it was more difficult for two of the 
subjects to obtain the requisite amount of protein when on a limited 
diet of one kind of nut combined with fruits than it was when they were 
unrestricted and ate of a variety of each. In nearly all cases where the 
diet was limited in variety, consisting of combinations of one or two 
fruits with one kind of nuts, the subject uniformly complained of a 
constant craving for something else, as green vegetables or cereals. 
At such times it was found that the coefficients of digestibility were 
lower than those recorded when the subject ate some vegetables or 
cereals which made the diet more appetizing. 
The dietaries which included cereals furnished more protein and 
energy in most cases than those which were limited strictly to fruit 
and nuts. 
The chief sources of nutriment in fruits are the carbohydrates, which, 
judging by results of the experiments here reported, possess a 
coefficient of digestibility only slightly lower than the carbohydrates 
of the mixed diet. 
The cost of the food per person per day in the nine dietary studies 
varied from 18 cents to 46 cents. 
The amount of nitrogen excreted in the urine was small, as would 
be expected when the diet contains so little protein. Nitrogen equi- 
librium was maintained in 14 of the 31 digestion experiments, and in 
