Markandeyapurana 34.57

34.57

na bhakṣayīta satataṃ pratyakṣalavaṇāni ca /
varjyaṃ ciroṣitaṃ putra ! bhaktaṃ paryuṣitañca yat //

“He should never eat flesh from the back, or flesh unfit for the gods and pitṛs, or prohibited flesh, my son, or things which are visibly salt. Pood that is long stale or that is not fresh must be avoided, my royal son, because of the changes that occur in flour, vegetables, sugarcane and milk; and meat long stale must be avoided, because of the change[9] that occurs in it.