The articles which come under this head, are usually called the condiments. In regard to these, Dr. Pereira remarks,—
“The relish for flavoring, or seasoning ingredients, manifested by almost every person, would lead us to suppose that these substances serve some useful purpose beyond that of merely gratifying the palate. At present, however, we have no evidence that they do. They stimulate, but do not seem to nourish. The volatile oil they contain is absorbed, and then thrown out of the system, still possessing its characteristic odor.”
The articles used for food of this kind, are the sweet herbs employed for seasoning, such as Thyme, Summer Savory, and the like, and the spices, such as Cloves, Cinnamon, Nutmeg, Pepper, and Ginger. Mustard, Horseradish, Water Cresses, Garlic, and Onions, contain these stimulating oils, combined with some nourishing food.
“Condiments,” says Dr. Beaumont, “particularly those of a spicy kind, are non-essential to the process of digestion in a healthy state of the system. They afford no nutrition. Though they may assist the action of a debilitate stomach for a time, their continual use never fails to produce an indirect debility of that organ. They affect it as alcohol and other stimulants do—the present relief afforded is at the expense of future suffering. Salt and Vinegar are exceptions when used in moderation. They both assist in digestion, Vinegar by rendering muscular fibre more tender, and both together, by producing a fluid having some analogy to the gastric juice.”
FOOD THAT IS ENTIRELY UNDIGESTIBLE.
There is no kind of food used which consists exclusively of indigestible matter. But it often is the case, that a certain amount of indigestible matter is mixed with nourishing food, and serves, by its mechanical aid, to promote the healthful action of the stomach and bowels. This is the reason why unbolted flour is deemed more healthful than fine flour, and is consequently preferred for dyspeptics. But where there is too great a quantity of such indigestible matter, or where it is not properly combined with digestible food, it proves injurious and often dangerous. This is the case when the skins and seeds of fruits are swallowed, which always pass off entirely undigested.
FOOD THAT IS UNHEALTHFUL IN NATURE, OR MADE SO BY COOKING.
The most injurious food, of any in common use, is the animal oils, and articles cooked with them. On this subject, Dr. Pereira remarks:—“Fixed oil, or fat, is more difficult of digestion, and more obnoxious to the stomach, than any other alimentary principle. Indeed, in concealed forms, I believe it will be found to be the offending ingredient in nine-tenths of the dishes which disturb weak stomachs. Many dyspeptics who avoid fat meat, butter, and oil, unwittingly eat it in some concealed form. Liver, the yolk of eggs, and brains, such individuals should eschew, as they abound in oily matter.”
“The influence of heat on fatty substances effects chemical changes, whereby they are rendered more difficult of digestion, and more obnoxious to the stomach. Hence those culinary operations in which fat or oil is subjected to high temperatures, are objectionable.”
“Fixed oils give off, while boiling, carbonic acid, an inflammable vapor, and an acrid oil, called Acroleon, while the fatty acids of the oil are, in part, set free. It has always appeared to me that cooked butter proves more obnoxious to the stomach than cooked Olive oil. This I ascribe to the facility with which, under the influence of heat, the acrid, volatile acids of butter are set free. The fat of salt pork and bacon is less injurious to some dyspeptics than fresh animal fats. This must depend on some change effected by curing.”