ɪn də ˈænɪmɚ ɹˌoʊmən tˈuː fˈoːɹ.fˈoːɹhˈʌndɹɪd sˈɪkstiːn bˈiː twˈɛnti ˈeɪt dˈæʃ twˈɛnti nˈaɪn, ˈæɹɪstˌɑːɾəl sˈɛz: ˈɔːl fˈuːd mˈʌst biː kˈeɪpəbəl ʌv bˌiːɪŋ daɪdʒˈɛstᵻd, ænd ðæt hˌuːz æktˈɪvᵻɾi kˈɔːzᵻz daɪdʒˈɛstʃən ɪz hˈiːt.
In De anima ii 4.416b28-29, Aristotle says: 'All food must be capable of being digested, and that whose activity causes digestion is heat.