Plutarch's Symposiacs by Plutarch

1. After these things were spoke, Philo the physician started the first question, asserting that thirst did not arise from the want of nourishment, but from the different transfiguration of certain passages. For, says he, this may be made evident, partly from what we see happens to those that thirst in the night, who, if sleep chance to steal upon them, though they did not drink before, are yet rid of their thirst; partly from persons in a fever, who, as soon as the disease abates or is removed, thirst no more. Nay, a great many men, after they have bathed or vomited, perceive presently that their thirst is gone; yet none of these add any thing to their former moisture, but only the transfiguration of the pores causeth a new order and disposition. And this is more evident in hunger; for many sick persons, at the same time when they have the greatest need of meat, have no stomach. Others, after they have filled their bellies, have the same stomachs, and their appetites are rather increased than abated. There are a great many besides who loathe all sorts of diet, yet by taking of a pickled olive or caper recover and confirm their lost appetites. This doth clearly evince, that hunger proceeds from some change in the pores, and not from any want of sustenance, forasmuch as such kind of food lessens the defect by adding food, but increases the hunger; and the pleasing relish and poignancy of such pickles, by binding and straitening the mouth of the ventricle, and again by opening and loosening of it, beget in it a convenient disposition to receive meat, which we call by the name of appetite.

2. I must confess this discourse seemed to carry in it some shadow of reason and probability; but in the main it is directly repugnant to the chief end of nature, to which appetite directs every animal. For that makes it desire a supply of what they stand in need of, and avoid a defect of their proper food. Now to deny that this very thing, which principally distinguishes an animate creature from an inanimate, conduces to the preservation and duration of such a creature, being that which craves and receives those things which the body needs to supply its wants, and, on the contrary, to suppose that such an appetite arises from the transfiguration or the greater or lesser size of the pores, is an absurdity worthy only of such as have no regard at all for Nature. Besides, it is absurd to think that a body through the want of natural heat should be chilled, and should not in like manner hunger and thirst through the want of natural moisture and nourishment. And yet this is more absurd, that Nature when overcharged should desire to disburden herself, and yet should not require to be filled on account of emptiness, but on account of some affection or other, I know not what. Moreover, these needs and supplies in relation to animals have some resemblance to those we see in husbandry. There are a great many like qualities and like provisions on both sides. For in a drought we water our grounds, and in case of excessive heat, we frequently make use of moderate coolers; and when our fruits are too cold, we endeavor to preserve and cherish them, by covering and making fences about them. And for such things as are out of the reach of human power, we implore the assistance of the Gods, that is, to send us softening dews, sunshines qualified with moderate winds; that so Nature, being always desirous of a due mixture, may have her wants supplied. And for this reason I presume it was that nourishment is called τροφή (from τηροῦν), because it watches and preserves Nature. Now Nature is preserved in plants, which are destitute of sense, by the favorable influence of the circumambient air (as Empedocles says), moistening them in such a measure as is most agreeable to their nature. But as for us men, our appetites prompt us on to the chase and pursuance of whatsoever is wanting to our natural temperament.