It is a very great oversight in the education of youth, that they be not taught betimes some common and necessary precepts about diet, acquainting them what tendeth to health and life, and what to sickness, pain, and death; and it were no unprofitable or unnecessary thing, if princes took a course that all their subjects might have some such common needful precepts familiarly known; (as if it were in the books that children first learn to read in, together with the precepts of their moral duty;) for it is certain, that men love not death or sickness, and that all men love their health and life; and therefore those that fear not God, would be much restrained from excess by the fear of sickness and of death: and what an advantage this would be to the commonwealth, you may easily perceive, when you consider what a mass of treasure it would save, besides the lives, and health, and strength of so many subjects.[420] And it is certain, that most people have no considerable knowledge, what measure is best for them; but the common rule that they judge by is their appetite. They think they have eaten enough, when they have eaten as long as they have list; and not before. If they could eat more with an appetite, and not be sick after it, they never think they have been guilty of gluttony or excess.
First, therefore, you must know, that appetite is not to be your rule or measure, either for quantity, quality, or time.[421] For, 1. It is irrational, and reason is your ruling faculty, if you are men. 2. It dependeth on the temperature of the body, and the humours and diseases of it, and not merely on the natural need of meat. A man in a dropsy is most thirsty, that hath least cause to drink: though frequently in a putrid or malignant fever, a draught of cold drink would probably be death, yet the appetite desireth it nevertheless. Stomachs that have acid humours, have commonly a strong appetite, be the digestion never so weak, and most of them could eat with an appetite above twice as much as they ought to eat. And on the contrary, some others desire not so much as is necessary to their sustenance, and must be urged to eat against their appetite. 3. Most healthful people in the world have an appetite to much more than nature can well digest, and would kill themselves if they pleased their appetites; for God never gave man his appetite to be the measure of his eating or drinking, but to make that grateful to him, which reason biddeth him take. 4. Man's appetite is not now so sound and regular as it was before the fall; but is grown more rebellious and unruly, and diseased as the body is: and therefore it is now much more unfit to be our measure, than it was before the fall. 5. You see it even in swine, and many greedy children, that would presently kill themselves, if they had not the reason of others to rule them. 6. Poison itself may be as delightful to the appetite as food; and dangerous meats, as those that are most wholesome. So that it is most certain, that appetite is not fit to be the measure of a man. Yet this is true withal, that when reason hath nothing against it, then an appetite showeth what nature taketh to be most agreeable to itself; and reason therefore hath something for it (if it have nothing against it); because it showeth what the stomach is like best to close with and digest; and it is some help to reason to discern when it is prepared for food.
Secondly, it is certain also, that the present feeling of ease or sickness, is no certain rule to judge of your digestion, or your measure by; for though some tender, relaxed, windy stomachs, are sick or troubled when they are overcharged, or exceed their measure, yet with the most it is not so; unless they exceed to very swinishness, they are not sick upon it, nor feel any hurt at present by less excesses, but only the imperfection of concoction doth vitiate the humours, and prepare for sicknesses by degrees (as is aforesaid); and one feeleth it a month after in some diseased evacuations; and another a twelvemonth after; and another not of many years, till it have turned to some uncurable disease (for the diseases that are bred by so long preparations are ordinarily much more uncurable, than those that come but from sudden accidents and alterations, in a cleaner body). Therefore to say, I feel it do me no harm, and therefore it is no excess, is the saying of an idiot, that hath no foreseeing reason, and resisteth not an enemy while he is garrisoning, fortifying, and arming himself, but only when it comes to blows: or like him that would go into a pesthouse, and say, I feel it do me no harm; but within few days or weeks he will feel it. As if the beginning of a consumption were no hurt to them, because they feel it not! Thus living like a beast, will at last make men judge like beasts; and brutify their brains as well as their bellies.
[Sidenote: Rules for the measure of eating.]