11. Water glass in upper right corner of tray.
12. Second vegetable dish placed on the upper right side of dinner plate.
13. Place dessert to the upper left of dinner plate.
Suggestions for Serving.—Make tray as attractive as possible.
In the cases requiring special diets, the nurse should make out the “diet sheet” for the day. In hospitals this is passed to the dietitian, who carries out the directions laid down by the physician. The nurse, however, should carefully check the tray before serving it, since mistakes sometimes occur, and to give the wrong food to a patient suffering from certain disorders may give rise to serious trouble, causing pain and discomfort and at times death.
Contamination of Food.—Food should always be protected from dirt and dust and from contamination and pollution from flies and other insects. Typhoid fever and certain intestinal disturbances have been known to result from flies coming in contact with raw food—milk, for example. Poisoning due to polluted water used to freshen vegetables has already been spoken of. All of these types of poisoning may be avoided by using care in the handling of the fresh foods. Ptomaines, however, are not easy to prevent. Their source cannot always be traced to one particular article of diet. They may be present in cooked, raw, frozen, or canned foods. At times the evidence of extreme decomposition will be found in the foods themselves, while at other times there will be no such evidence in the food, but the result of the ptomaine will be perfectly evident whenever certain individuals partake of that food. This is a personal idiosyncrasy which it is impossible to account for.
Food Poisoning.—Poison caused by decomposed eggs has manifested itself in individuals who have partaken of cake in which such eggs were used. Canned meat and fish have produced the most violent types of ptomaine poisoning. As a rule in these cases the canned article has begun to decompose and while the decomposition may not have advanced sufficiently far to be discernible from the flavor or odor, it is there, and if the resistance of the individual eating this food is not great, serious danger may result. Poisoning develops in some individuals upon the eating of shellfish, strawberries, oranges, pimentos, and various other foods,—another evidence of personal idiosyncrasy against certain articles of diet. There is no way to overcome these idiosyncrasies; the only thing to do is to warn the individuals so affected to let the offending foods alone.
ADULTERATION OF FOOD
The adulteration of food, which formerly was practised by unscrupulous dealers to cover up inferior articles, or by manufacturers to prevent or arrest decomposition in canned goods, is regulated by law. The passage of the National Pure Food and Drug Act gave the Government authority to regulate the preservatives and coloring matter used in canned and bottled goods, forcing the manufacturers to state on the label the exact contents of each bottle or can. There are likewise stringent laws governing the adulteration of milk, butter, and other articles of food.
Tests for Adulterants.—Boric acid, borax, and formaldehyde are the preservatives more often found in milk. These chemicals are introduced to arrest the natural souring and decomposition which takes place after milk reaches a certain age. Occasionally salicylic acid and sodium carbonate are used. Formaldehyde may be detected by placing about 20 c.c. of milk in a small glass vessel or tube. Dilute with an equal amount of pure water, add commercial sulphuric acid, allowing it to flow gently down the inside of the tube. A purple ring will appear at the zone of contact if formaldehyde is present. “Boric acid and borax may be detected by adding a drop or two of hydrochloric acid to a few drops of milk in a white dish and then several drops of a saturated alcoholic solution of turmeric. The dish is then heated gently for a few minutes, and, if boric acid or borax is present, a pink or dark red color will appear. A dark blue-green should appear when the dish is cooled and a drop of ammonia added.”[28]