How, O monks, should the nutriment edible food be considered?
Suppose a couple, husband and wife, have set out on a journey through the desert, carrying only limited provisions. They have with them their only son, dearly beloved by them. Now, while these two traveled through the desert, their limited stock of provisions ran out and came to an end, but there was still a stretch of desert not yet crossed. Then the two thought: 'Our small stock of provisions has run out, it has come to an end; and there is still a stretch of desert that is not yet crossed. Should we not kill our only son, so dearly beloved, prepare dried and roasted meat, and eating our son's flesh, we may cross in that way the remaining part of the desert, lest all three of us perish?'
And these two, husband and wife, killed their only son, so dearly beloved by them, prepared dried and roasted meat, and, eating their son's flesh, crossed in that way the remaining part of the desert. And while eating their son's flesh, they were beating their breast and crying: 'Where are you, our only and beloved son? Where are you, our only and beloved son?'
What do you think, O monks? Will they eat the food for the pleasure of it, for enjoyment, for comeliness' sake, for (the body's) embellishment?
Certainly not, O Lord.
Will they not rather eat the food merely for the sake of crossing the desert?
So it is, O Lord.
In the same manner, I say, O monks, should edible food be considered. If, O monks, the nutriment edible food is comprehended, the lust for the five sense-objects is (thereby) comprehended. And if lust for the five sense-objects is comprehended, there is no fetter enchained by which a noble disciple might come to this world again.
Puttamansa Sutta: A Son's Flesh