This much thou hast taught me: that I should learn to take food as medicine. But during that time when I pass from the pinch of emptiness to the contentment of fullness, it is in that very moment that the snare of appetite lies baited for me. For the passage itself is pleasant; there is no other way of passing thither, and necessity compels us to pass. And while health is the reason for our eating and drinking, yet a perilous delight joins itself to them as a handmaid; and indeed, she tries to take precedence in order that I may want to do for her sake what I say I want to do for health’s sake. They do not both have the same limit either. What is sufficient for health is not enough for pleasure…It is not the uncleanness of meat that I fear, but the uncleanness of an incontinent appetite. I know that permission was granted for Noah to eat every kind of flesh that was good for food; that Elijah was fed with flesh; that John, blessed with a wonderful abstinence, was not polluted by the living creatures (that is, the locusts) on which he fed. And I also know that Esau was deceived by his hungering after lentils and that David blamed himself for desiring water, and that our King was tempted not by flesh but by bread. And, thus, the people in the wilderness truly deserved their reproof, not because they desired meat, but because in their desire for food they murmured against the Lord. 

Set down, then, in the midst of these temptations, I strive daily against my own appetite for food and drink. For it is not the kind of appetite I am able to deal with by cutting it off once for all, and thereafter not touching it, as I was able to do with fornication. The bridle of the throat, therefore, must be held in the mean between slackness and tightness. And who, O Lord, is he who is not in some degree carried away beyond the bounds of necessity? Whoever he is, he is great; let him magnify thy name. But I am not such a one, “for I am a sinful man.”    

The Confessions - Augustine