An elementary physiology and hygiene for use in upper grammar grades . rger proportionthan is contained even in meat. Although they arenot so easily digested as meat, they serve as an excel-lent substitute, and they are cheaper. Fruits and Vegetables. — Although most fruits andvegetables contain little of the real food substances,they stimulate the appetite and thus give relish to themore substantial foods. They are composed largely ofwater, with a small amount of starch or sugar, flavoringmatter which makes them pleasant to the taste, and alsocertain salts which aid digestion. Some of them, h
An elementary physiology and hygiene for use in upper grammar grades . rger proportionthan is contained even in meat. Although they arenot so easily digested as meat, they serve as an excel-lent substitute, and they are cheaper. Fruits and Vegetables. — Although most fruits andvegetables contain little of the real food substances,they stimulate the appetite and thus give relish to themore substantial foods. They are composed largely ofwater, with a small amount of starch or sugar, flavoringmatter which makes them pleasant to the taste, and alsocertain salts which aid digestion. Some of them, however, such as potatoes, beets,bananas, cocoanuts, and nuts, contain sufficient starch,proteid, sugar, or fatto be valuable asfoods. Indeed, vege-tables and acid fruitsseem to be needed bythe body, as sailorsor explorers, whendeprived of them,suffer from scurvyand other diseases. Figure 5 representsa bit of potato magnified, showing the grains of the potato consists so largely of starch, it is a fuelfood, and we should eat with it meat, milk, cheese, or. ?~~ Starch Fig. 5. — A Small Bit of Potato. Highly magnified. Showing cells filledwith grains of starch. 24 PHYSIOLOGY AND HYGIENE some other food which will supply proteids for thebuilding material which the potato lacks. We may eat freely of fruits if they are ripe and per-fectly sound, but unripe and overripe fruits are un-wholesome and injurious to health. OTHER MATERIALS NOT TRUE FOODS There are certain other substances which we eat ordrink that are not true foods. Some of them are neces-sary to life, some of them are of use, others may beharmful. Let us see what some of these are. Water. — The shipwrecked sailor who is cast ashoreon a rocky island or drifts about in an open boat canlive for many days without food, but without water hesoon becomes almost crazed with thirst, and in avery few days he dies. Our blood, muscles, and vitalorgans all contain water. Without this necessary fluid,the foods eaten cou
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
