וְשַׂמְתָּ֣ שַׂכִּ֣ין בְּלֹעֶ֑ךָ אִם־בַּ֖עַל נֶ֣פֶשׁ אָֽתָּה׃
Mesilat Yesharim
The prohibition in the food, as we explained, is literally a poison to the heart and soul. If so, then who among the sensible will be lenient in a situation where there is suspicion of prohibition in the food? On this it is written "and put a knife into your mouth, if you are a person given to appetite" (Mishlei 23:2).