In all tropical and semi-tropical countries rice occupies the same position that corn does in the temperate zone. It is more deficient in proteids and in fat than any other food grain, while the starch of rice is more easily digested than any other form of cereal starch. This grain, however, is almost entirely devoid of mineral constituents, and for this reason it is productive of serious nutritive derangements when indulged in too freely. This deficiency can be overcome by taking a liberal quantity of green salads, or fresh vegetables, whenever rice is eaten.
Buckwheat
Buckwheat is a grain whose consumption is very limited, owing to the fact that it is dark in color. It compares favorably with wheat and corn as to nutritive elements, and is now much used as a winter food by the northern people.
USES OF GRAINS
The use of grains as an article of food may be considered under three headings:
1 As a source of energy
2 As a source of nitrogen
3 Grain as a remedial food; that is, as a source of cellulose or roughness, for the regulation of intestinal action
(1) GRAIN AS A SOURCE OF ENERGY
Too much grain consumed
All grains are composed largely of starch, therefore the question of energy to be derived from this source is one of assimilation and use. The use of grains in the diet deserves the most careful consideration, and the study should not be confined to any particular grain, but to the entire group, and especially to the method of preparation, and the quantity that should be consumed under the varying conditions of age, temperature of environment, and work or activity. The conventional American diet contains such an abnormal quantity of grain-starch, and the methods of preparation are so unnatural, that the Food Scientist, in practise, will find many people whose digestive organs have become so deranged that he may deem it necessary to prohibit grain-starch almost entirely.
The grown person, pursuing the ordinary sedative occupation, should not eat more than three or four ounces of cereal food a day, while the manual laborer should not consume more than five or six ounces each twenty-four hours. This quantity contemplates cool, or winter weather. In summer this quantity should be reduced according to work or activity.