Q. Is it permitted to sell or feed someone food that is healthy and not contaminated, but disgusting and loathsome by its origins, if the fellow that eats it is totally unaware of it? (e.g. food that a rodent ate some separate part of it, and was not contaminated, or was kept properly sealed in a freezer where human body parts and similar were also stored etc.).
A. Shulchan Aruch (Y.D. 116: 6) rules that it is prohibited to consume food and drinks that are disgusting to one. The prohibition is based on the pasuk (Vayikra 11: 43) “Al Teshaktzu – You shall not make yourselves abominable with any creeping creature that creeps, and you shall not defile yourselves with them.”
Poskim disagree whether this prohibition in this case is Biblical (Yereim 73, Ritvo quoting Rema – Makos 16, Beis Yosef Y.D. 116, et. al). While others maintain it is only Rabbinical (Ritvo ibid. Lebush, P’ri Chodosh Y.D. ibid.), and in doubt one may be more lenient.
Daas Kedoshim (Y.D. 15: 2), Imrei Yosher (1: 165), Igros Moshe (Y.D. 1: 31) and others, assert that the prohibition of ba’al teshaktzu applies only if the person consuming the loathsome items is aware of their origin and condition and is therefore affected.
Minchas Yechiel (3: 81) debates whether one is obliged to inform the would be consumer of the origins and history of that food, since after all, if he does not know he does not transgress the prohibition.
Horav Shlomo Miller’s Shlit’a opinion is that one does not have to inform the receiver, if he is not aware and will not be affected at all.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a