The Vedanta Sutras of Badarayana: Third Adhyâya. Fourth Pâda.: III, 4, 30
The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut [1896]
30. And this is said in Smriti also.
That in cases of need both he who knows and he who does not know may eat any food Smriti also states; compare e.g. 'He who being in danger of his life eats food from anywhere is stained by sin no more than the lotus leaf by water.'--On the other hand, many passages teach that unlawful food is to be avoided. 'Intoxicating liquor the Brâhmana must permanently forego;' 'Let them pour boiling spirits down the throat of the Brâhmana who drinks spirits;' 'Spirit-drinking worms grow in the
mouth of the spirit-drinking man, because he enjoys what is unlawful.'