The Compendium of Caraka 1.28.6

1.28.6

evaṃvādinaṃ bhagavantamātreyamagniveśa uvāca dṛśyante hi bhagavan hitasamākhyātamapyāhāramupayuñjānā vyādhimantaścāgadāśca tathaivāhitasamākhyātam evaṃ dṛṣṭe kathaṃ hitāhitopayogaviśeṣātmakaṃ śubhāśubhaviśeṣamupalabhāmaha iti //

To the venerable Ātreya who spoke thus, Agniveśa said: "Venerable sir, those who consume food described as wholesome are indeed seen to be diseased as well as healthy, and likewise those [who consume food] described as unwholesome. Since this is observed, how do we understand the difference between good and bad as consisting in distinctions in the consumption of wholesome and unwholesome [food]?"