I have the following, "4 Rules for Eating Animal Parts":
1)The part must be a muscle.
2)The part must not be visible from the outside under any normal circumstance.
3)The part must not produce any excretion/substance that is visible from the outside under any normal circumstance.
4)The part must not be necessary for survival.
Kidneys fail rules 1 and 4, and technically 3.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.