Shiva Purana
हृद्यान्यप्यन्नपानानि यं प्राप्य सुरभीणि च ॥ अशुचित्वं प्रयांत्याशु किमन्यदशुचिस्ततः ॥ ५॥
Even after taking in sweet, fragrant and delicious foodstuffs and drinks the body becomes impure quickly. What else is more impure than this.
english translation
hRdyAnyapyannapAnAni yaM prApya surabhINi ca ॥ azucitvaM prayAMtyAzu kimanyadazucistataH ॥ 5॥
hk transliteration by Sanscript