Book 1
3
But above all things everyone should be acquainted with the nature of his own body, for some are spare, others obese; some hot, others more frigid; some moist, others dry; some are costive, in others the bowels are loose. It is seldom but that a man has some part of his body weak. So then a thin man ought to fatten himself up, a stout one to thin himself down; a hot man to cool himself, a cold man to make himself warmer; the moist to dry himself up, the dry to moisten himself; he should render firmer his motions if loose, relax them if costive; treatment is to be always directed to the part which is mostly in trouble.
3
Now the body is fattened: by moderate exercise, by oftener resting, by anointing, and by the bath if after a meal at midday; by the bowels being confined, by winter cold in moderation, by sleep adequate but not over long, by a soft couch, by a tranquil spirit, by food whether solid or fluid which is sweet and fatty; by meals rather frequent and as large as it is possible to digest. The body is thinned: by hot water if one bathes in it and especially if salt; by the bath on an empty stomach, by a scorching sun, by heat of all kinds, by worry, by late nights; by sleep unduly short or overlong, by a hard bed throughout the summer; by running or much walking or any violent exercise; by a vomit, by purgation, by sour and harsh things consumed; by a single meal a day; by the custom of drinking wine not too cold upon an empty stomach.
