SECT. L.—ON LOSS OF APPETITE.
When loss of appetite is occasioned by depraved humours, we must give those kinds of food and drink which will either clear away such humours by vomiting, or downwards by the bowels, or those that by dilution will render them better. You have the materials of these things treated of in the [First Book] of this work. Should the loss of appetite be occasioned by debility, since all debility is owing to an intemperament of the parts, we must cure the species of intemperament by its contraries. Wherefore we will give a more particular account of loss of appetite in treating of stomach complaints in the [Third Book]. But in fevers we must straightway endeavour to bring back the appetite with aromatics, more particularly by giving polenta moistened with water, or oxycrate, or diluted wine, or a decoction of some of the fragrant and astringent fruits; by gentle unction and moderate friction of the whole body, by chafing, by bathing the face, and swallowing a small quantity of water; and, by putting the fingers down the throat, the stomach has been roused to bring up the food, more especially if the fluid discharged be bilious or acid. After the first days, cataplasms of dates, of apples, of the wild wine, of wormwood, and of aloes, ought to be applied over the stomach. Let a variety of simple food be prepared, and from grain, having some difference from the common articles, but not very different from those used in fevers; and among them those fruits which do not readily turn acid, nor are very sweet, but are ripe; however, they are not to be eaten to satiety, but only so as to whet the appetite for other food. While they are eating, the most delicious articles ought to be present, which may have the power to provoke and incite the desire. After the fever is gone, should the want of appetite continue during the recovery, yellow parsnip boiled with oxymel, and lettuces, and pickled olives, and capers, and pickles, the bulbi, and every other stomachic should be thought of; and, in particular, those things should be recollected in which the patient delighted most when in good health. Walking, gestation, vociferation, calefacient plasters, frictions, and exercises ought to be had recourse to. And drinking the propoma from wormwood, or from aloes, or swallowing the vinegar of squills to the amount of a mystrum, have proved excellent remedies.
Commentary. Galen’s explanation of the philosophy of the sense of appetite is very interesting. He remarks that the appetite is a refined species of touch, the seat of which is the mouth of the stomach, which, therefore, is supplied with nerves direct from the brain. He goes on to remark, that the earth is to plants what the stomach is to animals, supplying them with abundance of food as long as it is moistened by seasonable rains; but, when it becomes parched with drought, the plants in like manner are dried up for want of nutriment. (This comparison is borrowed without acknowledgment from Aristotle.) To animals, then, as not being fixed to the earth (with a few exceptions), nature bestowed a stomach which is to them a repository of food, such as the earth is to plants, and she further gave them a sense of want by which they have the desire of being filled with food and drink in due season. This desire of being filled is called the appetite, which arises from a sense of want, when the veins of the stomach absorb, and, as it were, suck from it, whereby a painful feeling is excited, the proper cure of which is a supply of food. The sensation then of sucking constitutes hunger. The loss of appetite may arise either from the sense of the sucking being lost, or from the process of sucking (absorption?) not taking place, or from the body not being evacuated. (De Causis Sympt. i, 7.) He treats of stomach affections very fully in his work ‘De Med. sec. Locos.’ (viii.)
Treatment similar to our author’s is recommended by Alexander (vii, 7), and by Oribasius (Synops. vi, 35.)
Avicenna evidently takes his plan of treatment from our author, for he recommends emetics, and afterwards fragrant things, with a plaster composed of fruits laid over the stomach, and wormwood, aloes, &c., internally. (iv, 1, 2, 26.) Among the causes of loss of appetite mentioned by him in another place are general disorder of the constitution in fevers, severe thirst, repletion with depraved humours, and insensibility of the mouth of the stomach, so that it does not perceive the suction of the veins. (iii, 13, 2, 7.)
Haly’s treatment is nearly the same. He recommends fragrant food and fragrant wine after the acme of the fever, gentle laxatives, and such modes of exercise as he can bear. (Pract. iii, 21.)