It comes in by 1 hole yet it oozes out of 9 holes!
The Ancient Elders said:
The tasty food and drink, so greatly prized
Crisp to chew, soft to suck, whatever it may be:
Through one door, a single hole, it is loaded in,
Through nine holes it later oozes out again.
The delicious drink, the dainty food,
Hard, soft, whatever it may be:
Man like to enjoy in crowded company,
Yet, when excreting it, he hides in secrecy!
The delightful drink, the delicate food,
Hot, cold, of many and various sorts:
Man may enjoy, pleased with full delight,
Yet, when excreting it, he feels disgust.
The adored drink, the pleasing food,
Crunchy or pulpy, whatever it may be:
The whole, even after just one single night,
Will all become putrid, fetid and stinking....
Inevitable side-effect of uncontrolled greed for food.
More on disabling the craving, urge, and greed for food:
http://What-Buddha-Said.net/drops/IV/Food_Disgust.htm
http://What-Buddha-Said.net/drops/IV/The_Sons_Flesch.htm
500 kg suffering from eating too much pleasure...!
Source: The Path of Purification: Visuddhimagga. XI 23
Written by a great explainer: Ven. Buddhaghosa in 5th century AC.
http://www.pariyatti.com/book.cgi?prod_id=771100
