Charak Samhita
आहारशक्तितश्चेतिआहारशक्तिरभ्यवहरणशक्त्याजरणशक्तयाचपरीक्ष्या; बलायुषीह्याहारायत्ते ॥१२०॥
॥ Assessment of aharashakti (power of assimilation)॥ Examination regarding power for assimilation (aharashakti) is to be done in respect of power of ingestion as well as digestion. Strength and life depends on diet.
english translation
AhArazaktitazcetiAhArazaktirabhyavaharaNazaktyAjaraNazaktayAcaparIkSyA; balAyuSIhyAhArAyatte ॥120॥
hk transliteration by Sanscript