Plutarch Quaestiones Convivales 6.3.1

[1] AFTER we had gone thus far, the master of the feast told the company that the former points were reasonably well discussed; and waiving at present the discourse concerning the evacuation and repletion of the pores, he requested us to fall upon another question, that is, how it comes to pass that hunger is staid by drinking, when, on the contrary, thirst is more violent after eating. Those who assign the reason to be in the pores seem with a great deal of ease and probability, though not with so much truth, to explain the thing. For seeing the pores in all bodies are of different sorts and sizes, the more capacious receive both dry and humid nourishment, the lesser take in drink, not meat; but the vacuity of the former causes hunger, of the latter thirst. Hence it is that men that thirst are never the better after they have eaten, the pores by reason of their straitness denying admittance to grosser nourishment, and the want of suitable supply still remaining. But after hungry men have drunk, the moisture enters the greater pores, fills the empty spaces, and in part assuages the violence of the hunger.