Charak Samhita
आहारपरिणामकरास्त्विमे भावा भवन्ति। तद्यथा- ऊष्मा, वायुः, क्लेदः, स्नेहः, कालः, समयोगश्चेति ॥१४॥
[Factors responsible for transformation of food] Factors responsible for transformation (digestion, assimilation and metabolism) of food are ushma, vayu, kleda, sneha, kala (time required for digestion) and samayoga (appropriate administration).
english translation
AhArapariNAmakarAstvime bhAvA bhavanti। tadyathA- USmA, vAyuH, kledaH, snehaH, kAlaH, samayogazceti ॥14॥
hk transliteration by Sanscript